1 <!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook V3.1//EN" [
2 <!entity % dummy "IGNORE">
3 <!entity supported SYSTEM "supported.sgml">
4 <!entity newfeatures SYSTEM "newfeatures.sgml">
5 <!entity p-intro SYSTEM "privoxy.sgml">
6 <!entity seealso SYSTEM "seealso.sgml">
7 <!entity buildsource SYSTEM "buildsource.sgml">
8 <!entity contacting SYSTEM "contacting.sgml">
9 <!entity history SYSTEM "history.sgml">
10 <!entity copyright SYSTEM "copyright.sgml">
11 <!entity license SYSTEM "license.sgml">
12 <!entity p-authors SYSTEM "p-authors.sgml">
13 <!entity config SYSTEM "p-config.sgml">
14 <!entity p-version "3.0.7">
15 <!entity p-status "stable">
16 <!entity % p-authors-formal "INCLUDE"> <!-- include additional text, etc -->
17 <!entity % p-not-stable "IGNORE">
18 <!entity % p-stable "INCLUDE">
19 <!entity % p-text "IGNORE"> <!-- define we are not a text only doc -->
20 <!entity % p-doc "INCLUDE"> <!-- and we are a formal doc -->
21 <!entity % p-readme "IGNORE">
22 <!entity % user-man "IGNORE">
23 <!entity % config-file "IGNORE">
24 <!entity % p-supp-userman "IGNORE"> <!-- Omit some from supported.sgml -->
25 <!entity my-copy "©"> <!-- kludge for docbook2man -->
26 <!entity % draft "IGNORE"> <!-- WIP stuff -->
27 <!entity my-app "<application>Privoxy</application>">
30 File : $Source: /cvsroot/ijbswa/current/doc/source/user-manual.sgml,v $
33 This file belongs into
34 ijbswa.sourceforge.net:/home/groups/i/ij/ijbswa/htdocs/
36 $Id: user-manual.sgml,v 2.31 2007/06/02 14:01:37 fabiankeil Exp $
38 Copyright (C) 2001-2007 Privoxy Developers http://www.privoxy.org/
41 ========================================================================
42 NOTE: Please read developer-manual/documentation.html before touching
43 anything in this, or other Privoxy documentation.
44 ========================================================================
51 <title>Privoxy &p-version; User Manual</title>
55 <!-- Completely the wrong markup, but very little is allowed -->
56 <!-- in this part of an article. FIXME -->
57 <link linkend="copyright">Copyright</link> &my-copy; 2001 - 2007 by
58 <ulink url="http://www.privoxy.org/">Privoxy Developers</ulink>
62 <pubdate>$Id: user-manual.sgml,v 2.31 2007/06/02 14:01:37 fabiankeil Exp $</pubdate>
66 Note: the following should generate a separate page, and a live link to it,
67 all nicely done. But it doesn't for some mysterious reason. Please leave
68 commented unless it can be fixed proper. For the time being, the
69 copyright/license declarations will be in their own sgml.
82 This is here to keep vim syntax file from breaking :/
83 If I knew enough to fix it, I would.
84 PLEASE DO NOT REMOVE! HB: hal@foobox.net
90 The <citetitle>Privoxy User Manual</citetitle> gives users information on how to
91 install, configure and use <ulink
92 url="http://www.privoxy.org/">Privoxy</ulink>.
95 <!-- Include privoxy.sgml boilerplate: -->
97 <!-- end privoxy.sgml -->
100 You can find the latest version of the <citetitle>Privoxy User Manual</citetitle> at <ulink
101 url="http://www.privoxy.org/user-manual/">http://www.privoxy.org/user-manual/</ulink>.
102 Please see the <link linkend="contact">Contact section</link> on how to
103 contact the developers.
107 <!-- Feel free to send a note to the developers at <email>ijbswa-developers@lists.sourceforge.net</email>. -->
113 <!-- ~~~~~ New section ~~~~~ -->
114 <sect1 label="1" id="introduction"><title>Introduction</title>
116 This documentation is included with the current &p-status; version of
117 <application>Privoxy</application>, v.&p-version;<![%p-not-stable;[,
118 and is mostly complete at this point. The most up to date reference for the
119 time being is still the comments in the source files and in the individual
120 configuration files. Development of a new version is currently nearing
121 completion, and includes significant changes and enhancements over
122 earlier versions. ]]>.
125 <!-- include only in non-stable versions -->
128 Since this is a &p-status; version, not all new features are well tested. This
129 documentation may be slightly out of sync as a result (especially with
130 CVS sources). And there <emphasis>may be</emphasis> bugs, though hopefully
135 <!-- ~~~~~ New section ~~~~~ -->
136 <sect2 id="features"><title>Features</title>
138 In addition to the core
139 features of ad blocking and
140 <ulink url="http://en.wikipedia.org/wiki/Browser_cookie">cookie</ulink> management,
141 <application>Privoxy</application> provides many supplemental
142 features<![%p-not-stable;[, some of them currently under development]]>,
143 that give the end-user more control, more privacy and more freedom:
145 <!-- Include newfeatures.sgml boilerplate here: -->
147 <!-- end boilerplate -->
152 <!-- ~ End section ~ -->
155 <!-- ~~~~~ New section ~~~~~ -->
156 <sect1 id="installation"><title>Installation</title>
159 <application>Privoxy</application> is available both in convenient pre-compiled
160 packages for a wide range of operating systems, and as raw source code.
161 For most users, we recommend using the packages, which can be downloaded from our
162 <ulink url="http://sourceforge.net/projects/ijbswa/">Privoxy Project
168 On some platforms, the installer may remove previously installed versions, if
169 found. (See below for your platform). In any case <emphasis>be sure to backup
170 your old configuration if it is valuable to you.</emphasis> See the <link
171 linkend="upgradersnote">note to upgraders</link> section below.
174 <!-- ~~~~~ New section ~~~~~ -->
175 <sect2 id="installation-packages"><title>Binary Packages</title>
177 How to install the binary packages depends on your operating system:
180 <!-- XXX: The installation sections should be sorted -->
182 <!-- ~~~~~ New section ~~~~~ -->
183 <sect3 id="installation-pack-rpm"><title>Red Hat and Fedora RPMs</title>
186 RPMs can be installed with <literal>rpm -Uvh privoxy-&p-version;-1.rpm</literal>,
187 and will use <filename>/etc/privoxy</filename> for the location
188 of configuration files.
192 Note that on Red Hat, <application>Privoxy</application> will
193 <emphasis>not</emphasis> be automatically started on system boot. You will
194 need to enable that using <command>chkconfig</command>,
195 <command>ntsysv</command>, or similar methods.
199 If you have problems with failed dependencies, try rebuilding the SRC RPM:
200 <literal>rpm --rebuild privoxy-&p-version;-1.src.rpm</literal>. This
201 will use your locally installed libraries and RPM version.
205 Also note that if you have a <application>Junkbuster</application> RPM installed
206 on your system, you need to remove it first, because the packages conflict.
207 Otherwise, RPM will try to remove <application>Junkbuster</application>
208 automatically if found, before installing <application>Privoxy</application>.
212 <!-- ~~~~~ New section ~~~~~ -->
213 <sect3 id="installation-deb"><title>Debian</title>
215 DEBs can be installed with <literal>apt-get install privoxy</literal>,
216 and will use <filename>/etc/privoxy</filename> for the location of
221 <!-- ~~~~~ New section ~~~~~ -->
222 <sect3 id="installation-pack-win"><title>Windows</title>
225 Just double-click the installer, which will guide you through
226 the installation process. You will find the configuration files
227 in the same directory as you installed <application>Privoxy</application> in.
230 Version 3.0.4 introduced full <application>Windows</application> service
231 functionality. On Windows only, the <application>Privoxy</application>
232 program has two new command line arguments to install and uninstall
233 <application>Privoxy</application> as a <emphasis>service</emphasis>.
237 <term>Arguments:</term>
240 <replaceable class="parameter">--install</replaceable>[:<replaceable class="parameter">service_name</replaceable>]
243 <replaceable class="parameter">--uninstall</replaceable>[:<replaceable class="parameter">service_name</replaceable>]
249 After invoking <application>Privoxy</application> with
250 <command>--install</command>, you will need to bring up the
251 <application>Windows</application> service console to assign the user you
252 want <application>Privoxy</application> to run under, and whether or not you
253 want it to run whenever the system starts. You can start the
254 <application>Windows</application> services console with the following
255 command: <command>services.msc</command>. If you do not take the manual step
256 of modifying <application>Privoxy's</application> service settings, it will
257 not start. Note too that you will need to give Privoxy a user account that
258 actually exists, or it will not be permitted to
259 write to its log and configuration files.
264 <!-- ~~~~~ New section ~~~~~ -->
265 <sect3 id="installation-pack-bintgz"><title>Solaris, NetBSD, HP-UX</title>
268 Create a new directory, <literal>cd</literal> to it, then unzip and
269 untar the archive. For the most part, you'll have to figure out where
270 things go. <!-- FIXME, more info needed? -->
274 <!-- ~~~~~ New section ~~~~~ -->
275 <sect3 id="installation-os2"><title>OS/2</title>
278 First, make sure that no previous installations of
279 <application>Junkbuster</application> and / or
280 <application>Privoxy</application> are left on your
281 system. Check that no <application>Junkbuster</application>
282 or <application>Privoxy</application> objects are in
288 Then, just double-click the WarpIN self-installing archive, which will
289 guide you through the installation process. A shadow of the
290 <application>Privoxy</application> executable will be placed in your
291 startup folder so it will start automatically whenever OS/2 starts.
295 The directory you choose to install <application>Privoxy</application>
296 into will contain all of the configuration files.
300 <!-- ~~~~~ New section ~~~~~ -->
301 <sect3 id="installation-mac"><title>Mac OSX</title>
303 Unzip the downloaded file (you can either double-click on the file
304 from the finder, or from the desktop if you downloaded it there).
305 Then, double-click on the package installer icon named
306 <literal>Privoxy.pkg</literal>
307 and follow the installation process.
308 <application>Privoxy</application> will be installed in the folder
309 <literal>/Library/Privoxy</literal>.
310 It will start automatically whenever you start up. To prevent it from
311 starting automatically, remove or rename the folder
312 <literal>/Library/StartupItems/Privoxy</literal>.
315 To start Privoxy by hand, double-click on
316 <literal>StartPrivoxy.command</literal> in the
317 <literal>/Library/Privoxy</literal> folder.
318 Or, type this command in the Terminal:
322 /Library/Privoxy/StartPrivoxy.command
326 You will be prompted for the administrator password.
330 <!-- ~~~~~ New section ~~~~~ -->
331 <sect3 id="installation-amiga"><title>AmigaOS</title>
333 Copy and then unpack the <filename>lha</filename> archive to a suitable location.
334 All necessary files will be installed into <application>Privoxy</application>
335 directory, including all configuration and log files. To uninstall, just
336 remove this directory.
340 <!-- ~~~~~ New section ~~~~~ -->
341 <sect3 id="installation-tbz"><title>FreeBSD</title>
344 Privoxy is part of FreeBSD's Ports Collection, you can build and install
345 it with <literal>cd /usr/ports/www/privoxy; make install clean</literal>.
348 If you don't use the ports, you can fetch and install
349 the package with <literal>pkg_add -r privoxy</literal>.
352 The port skeleton and the package can also be downloaded from the
353 <ulink url="https://sourceforge.net/project/showfiles.php?group_id=11118">File Release
354 Page</ulink>, but if you're interested in stable releases only you don't
355 gain anything by using them.
359 <!-- ~~~~~ New section ~~~~~ -->
360 <sect3 id="installattion-gentoo"><title>Gentoo</title>
362 Gentoo source packages (Ebuilds) for <application>Privoxy</application> are
363 contained in the Gentoo Portage Tree (they are not on the download page,
364 but there is a Gentoo section, where you can see when a new
365 <application>Privoxy</application> Version is added to the Portage Tree).
368 Before installing <application>Privoxy</application> under Gentoo just do
369 first <literal>emerge rsync</literal> to get the latest changes from the
370 Portage tree. With <literal>emerge privoxy</literal> you install the latest
374 Configuration files are in <filename>/etc/privoxy</filename>, the
375 documentation is in <filename>/usr/share/doc/privoxy-&p-version;</filename>
376 and the Log directory is in <filename>/var/log/privoxy</filename>.
382 <!-- ~~~~~ New section ~~~~~ -->
383 <sect2 id="installation-source"><title>Building from Source</title>
386 The most convenient way to obtain the <application>Privoxy</application> sources
387 is to download the source tarball from our
388 <ulink url="http://sourceforge.net/project/showfiles.php?group_id=11118&package_id=10571">project download
393 If you like to live on the bleeding edge and are not afraid of using
394 possibly unstable development versions, you can check out the up-to-the-minute
395 version directly from <ulink url="http://sourceforge.net/cvs/?group_id=11118">the
396 CVS repository</ulink>.
398 deprecated...out of business.
399 or simply download <ulink
400 url="http://cvs.sourceforge.net/cvstarballs/ijbswa-cvsroot.tar.bz2">the nightly CVS
405 <!-- include buildsource.sgml boilerplate: -->
407 <!-- end boilerplate -->
410 <!-- ~~~~~ New section ~~~~~ -->
411 <sect2 id="installation-keepupdated"><title>Keeping your Installation Up-to-Date</title>
413 As user feedback comes in and development continues, we will make updated versions
414 of both the main <link linkend="actions-file">actions file</link> (as a <ulink
415 url="http://sourceforge.net/project/showfiles.php?group_id=11118&release_id=103670">separate
416 package</ulink>) and the software itself (including the actions file) available for
421 If you wish to receive an email notification whenever we release updates of
422 <application>Privoxy</application> or the actions file, <ulink
423 url="http://lists.sourceforge.net/lists/listinfo/ijbswa-announce/">subscribe
424 to our announce mailing list</ulink>, ijbswa-announce@lists.sourceforge.net.
428 In order not to lose your personal changes and adjustments when updating
429 to the latest <literal>default.action</literal> file we <emphasis>strongly
430 recommend</emphasis> that you use <literal>user.action</literal> and
431 <literal>user.filter</literal> for your local
432 customizations of <application>Privoxy</application>. See the <link
433 linkend="actions-file">Chapter on actions files</link> for details.
441 <!-- ~ End section ~ -->
443 <!-- ~~~~~ New section ~~~~~ -->
444 <sect1 id="whatsnew">
445 <title>What's New in this Release</title>
447 There are many improvements and new features since <application>Privoxy 3.0.6</application>, the last stable release:
454 Header filtering can be done with dedicated header filters now. As a result
455 the actions <quote>filter-client-headers</quote> and <quote>filter-server-headers</quote>
456 that were introduced with <application>Privoxy 3.0.5</application> to apply
457 the content filters to the headers as, well have been removed again.
461 <!-- pre-3.0.6 changes:
464 There are a number of new <link linkend="actions-file">actions</link>:
472 <literal><link linkend="content-type-overwrite">content-type-overwrite</link></literal>
477 <literal><link linkend="crunch-client-header">crunch-client-header</link></literal>
482 <literal><link linkend="crunch-if-none-match">crunch-if-none-match</link></literal>
487 <literal><link linkend="crunch-server-header">crunch-server-header</link></literal>
492 <literal><link linkend="filter-client-headers">filter-client-headers</link></literal>
497 <literal><link linkend="filter-server-headers">filter-server-headers</link></literal>
502 <literal><link linkend="force-text-mode">force-text-mode</link></literal>
507 <literal><link linkend="handle-as-empty-document">handle-as-empty-document</link></literal>
512 <literal><link linkend="hide-accept-language">hide-accept-language</link></literal>
517 <literal><link linkend="hide-content-disposition">hide-content-disposition</link></literal>
522 <literal><link linkend="hide-if-modified-since">hide-if-modified-since</link></literal>
527 <literal><link linkend="inspect-jpegs">inspect-jpegs</link></literal>
532 <literal><link linkend="overwrite-last-modified">overwrite-last-modified</link></literal>
537 <literal><link linkend="redirect">redirect</link></literal>
542 <literal><link linkend="treat-forbidden-connects-like-blocks">treat-forbidden-connects-like-blocks</link></literal>
549 In addition, <literal><link linkend="fast-redirects">fast-redirects</link></literal>
550 has been significantly improved with enhanced syntax.
553 And <literal><link linkend="hide-referrer">hide-referrer</link></literal>
554 has a new option, <literal>conditional block</literal>.
561 <application>MS-Windows</application> versions can now be
563 linkend="installation-pack-win">installed and
564 started as a <emphasis>Windows service</emphasis></link>.
570 <filename>config</filename> has two new options:
572 linkend="enable-remote-http-toggle">enable-remote-http-toggle</link>,
574 linkend="forwarded-connect-retries">forwarded-connect-retries</link>.
577 And there is improved handling of the <link
578 linkend="user-manual">user-manual</link>
579 option, for placing documentation and help files on the local system.
585 There are six new <link linkend="FILTER">filters</link>.
591 Actions files problems and suggestions are now being directed to:
592 <ulink url="http://sourceforge.net/tracker/?group_id=11118&atid=460288">http://sourceforge.net/tracker/?group_id=11118&atid=460288</ulink>.
593 Please use this to report such configuration related problems as missed
594 ads, sites that don't function properly due to one action or another,
595 innocent images being blocked, etc.
601 In addition, there are numerous bug fixes and significant enhancements,
602 including error pages should no longer be cached if the problem is fixed,
603 much better DNS error handling, various logging improvements, and
604 configuration updates for better ad blocking and junk elimination.
612 <!-- ~~~~~ New section ~~~~~ -->
614 <sect2 id="upgradersnote">
615 <title>Note to Upgraders</title>
618 A quick list of things to be aware of before upgrading from earlier
619 versions of <application>Privoxy</application>:
627 Some installers may remove earlier versions completely, including
628 configuration files. Save any important configuration files!
633 On the other hand, other installers may not overwrite any existing configuration
634 files, thinking you will want to do that. You may want to manually check
635 your saved files against the newer versions to see if the improvements have
636 merit, or whether there are new options that you may want to consider.
637 There are a number of new features, but most won't be available unless
638 these features are incorporated into your configuration somehow.
643 See the full documentation on
644 <literal><link linkend="fast-redirects">fast-redirects</link></literal>
645 which has changed syntax, and will require adjustments to local configs,
646 such as <filename>user.action</filename>. You must reference the new
651 { +fast-redirects{check-decoded-url} }
660 The <filename>jarfile</filename>,
661 <ulink url="http://en.wikipedia.org/wiki/Browser_cookie">cookie</ulink> logger, is off by default now.
667 What constitutes a <quote>default</quote> configuration has changed,
668 and you may want to review which actions are <quote>on</quote> by
669 default. This is primarily a matter of emphasis, but some features
670 you may have been used to, may now be <quote>off</quote> by default.
671 There are also a number of new actions and filters you may want to
672 consider, most of which are not fully incorporated into the default
673 settings as yet (see above).
679 The default actions setting is now <literal>Cautious</literal>. Previous
680 releases had a default setting of <literal>Medium</literal>. Experienced
681 users may want to adjust this, as it is fairly conservative by &my-app;
682 standards and past practices. See <ulink
683 url="http://config.privoxy.org/edit-actions-list?f=default">
684 http://config.privoxy.org/edit-actions-list?f=default</ulink>. New users
685 should try the default settings for a while before turning up the volume.
691 The default setting has filtering turned <emphasis>off</emphasis>, which
692 subsequently means that compression is <emphasis>on</emphasis>. Remember
693 that filtering does not work on compressed pages, so if you use, or want to
694 use, filtering, you will need to force compression off. Example:
698 { +<link linkend="filter">filter</link>{google} +<link linkend="prevent-compression">prevent-compression</link> }
702 Or if you use a number of filters, or filter many sites, you may just want
703 to turn off compression for all sites in
704 <filename>default.action</filename> (or
705 <filename>user.action</filename>).
712 Also, <link linkend="SESSION-COOKIES-ONLY">session-cookies-only</link> is
713 off by default now. If you've liked this feature in the past, you may want
714 to turn it back on in <filename>user.action</filename> now.
721 <!-- I think it is best to keep this somewhat vague, in case -->
722 <!-- the situation changes under our feet. -->
723 Some installers may not automatically start
724 <application>Privoxy</application> after installation.
734 <!-- ~~~~~ New section ~~~~~ -->
735 <sect1 id="quickstart"><title>Quickstart to Using Privoxy</title>
741 Install <application>Privoxy</application>. See the <link
742 linkend="installation">Installation Section</link> below for platform specific
749 Advanced users and those who want to offer <application>Privoxy</application>
750 service to more than just their local machine should check the <link
751 linkend="config">main config file</link>, especially the <link
752 linkend="access-control">security-relevant</link> options. These are
759 Start <application>Privoxy</application>, if the installation program has
760 not done this already (may vary according to platform). See the section
761 <link linkend="startup">Starting <application>Privoxy</application></link>.
767 Set your browser to use <application>Privoxy</application> as HTTP and
768 HTTPS (SSL) <ulink url="http://en.wikipedia.org/wiki/Proxy_server">proxy</ulink>
769 by setting the proxy configuration for address of
770 <literal>127.0.0.1</literal> and port <literal>8118</literal>.
771 <emphasis>DO NOT</emphasis> activate proxying for <literal>FTP</literal> or
772 any protocols besides HTTP and HTTPS (SSL)! It won't work!
778 Flush your browser's disk and memory caches, to remove any cached ad images.
779 If using <application>Privoxy</application> to manage
780 <ulink url="http://en.wikipedia.org/wiki/Browser_cookie">cookies</ulink>,
781 you should remove any currently stored cookies too.
787 A default installation should provide a reasonable starting point for
788 most. There will undoubtedly be occasions where you will want to adjust the
789 configuration, but that can be dealt with as the need arises. Little
790 to no initial configuration is required in most cases.
793 See the <link linkend="configuration">Configuration section</link> for more
794 configuration options, and how to customize your installation.
795 You might also want to look at the <link
796 linkend="quickstart-ad-blocking">next section</link> for a quick
797 introduction to how <application>Privoxy</application> blocks ads and
804 If you experience ads that slip through, innocent images that are
805 blocked, or otherwise feel the need to fine-tune
806 <application>Privoxy's</application> behavior, take a look at the <link
807 linkend="actions-file">actions files</link>. As a quick start, you might
808 find the <link linkend="act-examples">richly commented examples</link>
809 helpful. You can also view and edit the actions files through the <ulink
810 url="http://config.privoxy.org">web-based user interface</ulink>. The
811 Appendix <quote><link linkend="actionsanat">Troubleshooting: Anatomy of an
812 Action</link></quote> has hints on how to understand and debug actions that
813 <quote>misbehave</quote>.
819 For easy access to &my-app;'s most important controls, drag the provided
820 <link linkend="bookmarklets">Bookmarklets</link> into your browser's
827 Please see the section <link linkend="contact">Contacting the
828 Developers</link> on how to report bugs, problems with websites or to get
835 Now enjoy surfing with enhanced control, comfort and privacy!
843 <!-- ~~~~~ New section ~~~~~ -->
845 <sect2 id="quickstart-ad-blocking">
846 <title>Quickstart to Ad Blocking</title>
848 NOTE: This section is deliberately redundant for those that don't
849 want to read the whole thing (which is getting lengthy).
852 Ad blocking is but one of <application>Privoxy's</application>
853 array of features. Many of these features are for the technically minded advanced
854 user. But, ad and banner blocking is surely common ground for everybody.
857 This section will provide a quick summary of ad blocking so
858 you can get up to speed quickly without having to read the more extensive
859 information provided below, though this is highly recommended.
862 First a bit of a warning ... blocking ads is much like blocking SPAM: the
863 more aggressive you are about it, the more likely you are to block
864 things that were not intended. And the more likely that some things
865 may not work as intended. So there is a trade off here. If you want
866 extreme ad free browsing, be prepared to deal with more
867 <quote>problem</quote> sites, and to spend more time adjusting the
868 configuration to solve these unintended consequences. In short, there is
869 not an easy way to eliminate <emphasis>all</emphasis> ads. Either take
870 the easy way and settle for <emphasis>most</emphasis> ads blocked with the
871 default configuration, or jump in and tweak it for your personal surfing
872 habits and preferences.
875 Secondly, a brief explanation of <application>Privoxy's </application>
876 <quote>actions</quote>. <quote>Actions</quote> in this context, are
877 the directives we use to tell <application>Privoxy</application> to perform
878 some task relating to WWW transactions (i.e. web browsing). We tell
879 <application>Privoxy</application> to take some <quote>action</quote>. Each
880 action has a unique name and function. While there are many potential
881 <application>actions</application> in <application>Privoxy's</application>
882 arsenal, only a few are used for ad blocking. <link
883 linkend="actions">Actions</link>, and <link linkend="actions-file">action
884 configuration files</link>, are explained in depth below.
887 Actions are specified in <application>Privoxy's</application> configuration,
888 followed by one or more URLs to which the action should apply. URLs
889 can actually be URL type <link linkend="af-patterns">patterns</link> that use
890 wildcards so they can apply potentially to a range of similar URLs. The
891 actions, together with the URL patterns are called a section.
894 When you connect to a website, the full URL will either match one or more
895 of the sections as defined in <application>Privoxy's</application> configuration,
896 or not. If so, then <application>Privoxy</application> will perform the
897 respective actions. If not, then nothing special happens. Furthermore, web
898 pages may contain embedded, secondary URLs that your web browser will
899 use to load additional components of the page, as it parses the
900 original page's HTML content. An ad image for instance, is just an URL
901 embedded in the page somewhere. The image itself may be on the same server,
902 or a server somewhere else on the Internet. Complex web pages will have many
903 such embedded URLs. &my-app; can deal with each URL individually, so, for
904 instance, the main page text is not touched, but images from such-and-such
909 The most important actions for basic ad blocking are: <literal><link
910 linkend="block">block</link></literal>, <literal><link
911 linkend="handle-as-image">handle-as-image</link></literal>,
913 linkend="handle-as-empty-document">handle-as-empty-document</link></literal>,and
914 <literal><link linkend="set-image-blocker">set-image-blocker</link></literal>:
922 <literal><link linkend="block">block</link></literal> - this is perhaps
923 the single most used action, and is particularly important for ad blocking.
924 This action stops any contact between your browser and any URL patterns
925 that match this action's configuration. It can be used for blocking ads,
926 but also anything that is determined to be unwanted. By itself, it simply
927 stops any communication with the remote server and sends
928 <application>Privoxy</application>'s own built-in BLOCKED page instead to
929 let you now what has happened (with some exceptions, see below).
935 <literal><link linkend="handle-as-image">handle-as-image</link></literal> -
936 tells <application>Privoxy</application> to treat this URL as an image.
937 <application>Privoxy</application>'s default configuration already does this
938 for all common image types (e.g. GIF), but there are many situations where this
939 is not so easy to determine. So we'll force it in these cases. This is particularly
940 important for ad blocking, since only if we know that it's an image of
941 some kind, can we replace it with an image of our choosing, instead of the
942 <application>Privoxy</application> BLOCKED page (which would only result in
943 a <quote>broken image</quote> icon). There are some limitations to this
944 though. For instance, you can't just brute-force an image substitution for
945 an entire HTML page in most situations.
951 <literal><link linkend="handle-as-empty-document">handle-as-empty-document</link></literal> -
952 sends an empty document instead of <application>Privoxy's</application>
953 normal BLOCKED HTML page. This is useful for file types that are neither
954 HTML nor images, such as blocking JavaScript files.
961 linkend="set-image-blocker">set-image-blocker</link></literal> - tells
962 <application>Privoxy</application> what to display in place of an ad image that
963 has hit a block rule. For this to come into play, the URL must match a
964 <literal><link linkend="block">block</link></literal> action somewhere in the
965 configuration, <emphasis>and</emphasis>, it must also match an
966 <literal><link linkend="handle-as-image">handle-as-image</link></literal> action.
969 The configuration options on what to display instead of the ad are:
973 <emphasis>pattern</emphasis> - a checkerboard pattern, so that an ad
974 replacement is obvious. This is the default.
979 <emphasis>blank</emphasis> - A very small empty GIF image is displayed.
980 This is the so-called <quote>invisible</quote> configuration option.
985 <emphasis>http://<URL></emphasis> - A redirect to any image anywhere
986 of the user's choosing (advanced usage).
995 The quickest way to adjust any of these settings is with your browser through
996 the special <application>Privoxy</application> editor at <ulink
997 url="http://config.privoxy.org/show-status">http://config.privoxy.org/show-status</ulink>
998 (shortcut: <ulink url="http://p.p/">http://p.p/show-status</ulink>). This
999 is an internal page, and does not require Internet access. Select the
1000 appropriate <quote>actions</quote> file, and click
1001 <quote><guibutton>Edit</guibutton></quote>. It is best to put personal or
1002 local preferences in <filename>user.action</filename> since this is not
1003 meant to be overwritten during upgrades, and will over-ride the settings in
1004 other files. Here you can insert new <quote>actions</quote>, and URLs for ad
1005 blocking or other purposes, and make other adjustments to the configuration.
1006 <application>Privoxy</application> will detect these changes automatically.
1010 A quick and simple step by step example:
1018 Right click on the ad image to be blocked, then select
1019 <quote><guimenuitem>Copy Link Location</guimenuitem></quote> from the
1027 url="http://config.privoxy.org/show-status">http://config.privoxy.org/show-status</ulink>
1032 Find <filename>user.action</filename> in the top section, and click
1033 on <quote><guibutton>Edit</guibutton></quote>:
1036 <!-- image of editor and actions files selections -->
1038 <figure pgwide="0" float="0"><title>Actions Files in Use</title>
1041 <imagedata fileref="files-in-use.jpg" format="jpg">
1044 <phrase>[ Screenshot of Actions Files in Use ]</phrase>
1053 You should have a section with only
1054 <literal><link linkend="block">block</link></literal> listed under
1055 <quote>Actions:</quote>.
1056 If not, click a <quote><guibutton>Insert new section below</guibutton></quote>
1057 button, and in the new section that just appeared, click the
1058 <guibutton>Edit</guibutton> button right under the word <quote>Actions:</quote>.
1059 This will bring up a list of all actions. Find
1060 <literal><link linkend="block">block</link></literal> near the top, and click
1061 in the <quote>Enabled</quote> column, then <quote><guibutton>Submit</guibutton></quote>
1062 just below the list.
1067 Now, in the <literal><link linkend="block">block</link></literal> actions section,
1068 click the <quote><guibutton>Add</guibutton></quote> button, and paste the URL the
1069 browser got from <quote><guimenuitem>Copy Link Location</guimenuitem></quote>.
1070 Remove the <literal>http://</literal> at the beginning of the URL. Then, click
1071 <quote><guibutton>Submit</guibutton></quote> (or
1072 <quote><guibutton>OK</guibutton></quote> if in a pop-up window).
1077 Now go back to the original page, and press <keycap>SHIFT-Reload</keycap>
1078 (or flush all browser caches). The image should be gone now.
1086 This is a very crude and simple example. There might be good reasons to use a
1087 wildcard pattern match to include potentially similar images from the same
1088 site. For a more extensive explanation of <quote>patterns</quote>, and
1089 the entire actions concept, see <link linkend="actions-file">the Actions
1094 For advanced users who want to hand edit their config files, you might want
1095 to now go to the <link linkend="act-examples">Actions Files Tutorial</link>.
1096 The ideas explained therein also apply to the web-based editor.
1099 There are also various
1100 <link linkend="filter">filters</link> that can be used for ad blocking
1101 (filters are a special subset of actions). These
1102 fall into the <quote>advanced</quote> usage category, and are explained in
1103 depth in later sections.
1110 <!-- ~ End section ~ -->
1113 <!-- ~~~~~ New section ~~~~~ -->
1114 <sect1 id="startup">
1115 <title>Starting Privoxy</title>
1117 Before launching <application>Privoxy</application> for the first time, you
1118 will want to configure your browser(s) to use
1119 <application>Privoxy</application> as a HTTP and HTTPS (SSL)
1120 <ulink url="http://en.wikipedia.org/wiki/Proxy_server">proxy</ulink>. The default is
1121 127.0.0.1 (or localhost) for the proxy address, and port 8118 (earlier versions
1122 used port 8000). This is the one configuration step <emphasis>that must be done
1126 Please note that <application>Privoxy</application> can only proxy HTTP and
1127 HTTPS traffic. It will not work with FTP or other protocols.
1130 <!-- image of Mozilla Proxy configuration -->
1132 <figure pgwide="0" float="0"><title>Proxy Configuration Showing
1133 Mozilla/Netscape HTTP and HTTPS (SSL) Settings</title>
1136 <imagedata fileref="proxy_setup.jpg" format="jpg">
1139 <phrase>[ Screenshot of Mozilla Proxy Configuration ]</phrase>
1147 With <application>Firefox</application>, this is typically set under:
1151 <guibutton>Tools</guibutton> -> <guibutton>Options</guibutton> -> <guibutton>General</guibutton> -> <guibutton>Connection Settings</guibutton> -> <guibutton>Manual Proxy Configuration</guibutton>
1156 Or optionally on some platforms:
1160 <guibutton>Edit</guibutton> -> <guibutton>Preferences</guibutton> -> <guibutton>General</guibutton> -> <guibutton>Connection Settings</guibutton> -> <guibutton>Manual Proxy Configuration</guibutton>
1166 With <application>Netscape</application> (and
1167 <application>Mozilla</application>), this can be set under:
1172 <!-- Mix ascii and gui art, something for everybody -->
1173 <!-- spacing on this is tricky -->
1174 <guibutton>Edit</guibutton> -> <guibutton>Preferences</guibutton> -> <guibutton>Advanced</guibutton> -> <guibutton>Proxies</guibutton> -> <guibutton>HTTP Proxy</guibutton>
1179 For <application>Internet Explorer v.5-6</application>:
1183 <guibutton>Tools</guibutton> -> <guibutton>Internet Options</guibutton> -> <guibutton>Connections</guibutton> -> <guibutton>LAN Settings</guibutton>
1187 Then, check <quote>Use Proxy</quote> and fill in the appropriate info
1188 (Address: 127.0.0.1, Port: 8118). Include HTTPS (SSL), if you want HTTPS
1189 proxy support too (sometimes labeled <quote>Secure</quote>). Make sure any
1190 checkboxes like <quote>Use the same proxy server for all protocols</quote> is
1191 <emphasis>UNCHECKED</emphasis>. You want only HTTP and HTTPS (SSL)!
1194 <!-- image of IE Proxy configuration -->
1196 <figure pgwide="0" float="0"><title>Proxy Configuration Showing
1197 Internet Explorer HTTP and HTTPS (Secure) Settings</title>
1200 <imagedata fileref="proxy2.jpg" format="jpg">
1203 <phrase>[ Screenshot of IE Proxy Configuration ]</phrase>
1211 After doing this, flush your browser's disk and memory caches to force a
1212 re-reading of all pages and to get rid of any ads that may be cached. Remove
1213 any <ulink url="http://en.wikipedia.org/wiki/Browser_cookie">cookies</ulink>,
1214 if you want <application>Privoxy</application> to manage that. You are now
1215 ready to start enjoying the benefits of using
1216 <application>Privoxy</application>!
1220 <application>Privoxy</application> itself is typically started by specifying the
1221 main configuration file to be used on the command line. If no configuration
1222 file is specified on the command line, <application>Privoxy</application>
1223 will look for a file named <filename>config</filename> in the current
1224 directory. Except on Win32 where it will try <filename>config.txt</filename>.
1227 <sect2 id="start-redhat">
1228 <title>Red Hat and Fedora</title>
1230 A default Red Hat installation may not start &my-app; upon boot. It will use
1231 the file <filename>/etc/privoxy/config</filename> as its main configuration
1236 # /etc/rc.d/init.d/privoxy start
1244 # service privoxy start
1249 <sect2 id="start-debian">
1250 <title>Debian</title>
1252 We use a script. Note that Debian typically starts &my-app; upon booting per
1253 default. It will use the file
1254 <filename>/etc/privoxy/config</filename> as its main configuration
1259 # /etc/init.d/privoxy start
1265 omitting 10/31/06 HB
1267 <sect2 id="start-suse">
1270 We use a script. It will use the file <filename>/etc/privoxy/config</filename>
1271 as its main configuration file. Note that SuSE starts Privoxy upon booting
1281 <sect2 id="start-windows">
1282 <title>Windows</title>
1284 Click on the &my-app; Icon to start <application>Privoxy</application>. If no configuration file is
1285 specified on the command line, <application>Privoxy</application> will look
1286 for a file named <filename>config.txt</filename>. Note that Windows will
1287 automatically start &my-app; when the system starts if you chose that option
1291 <application>Privoxy</application> can run with full Windows service functionality.
1292 On Windows only, the &my-app; program has two new command line arguments
1293 to install and uninstall &my-app; as a service. See the
1294 <link linkend="installation-pack-win">Windows Installation
1295 instructions</link> for details.
1299 <sect2 id="start-unices">
1300 <title>Solaris, NetBSD, FreeBSD, HP-UX and others</title>
1302 Example Unix startup command:
1306 # /usr/sbin/privoxy /etc/privoxy/config
1311 <sect2 id="start-os2">
1314 During installation, <application>Privoxy</application> is configured to
1315 start automatically when the system restarts. You can start it manually by
1316 double-clicking on the <application>Privoxy</application> icon in the
1317 <application>Privoxy</application> folder.
1321 <sect2 id="start-macosx">
1322 <title>Mac OSX</title>
1324 During installation, <application>Privoxy</application> is configured to
1325 start automatically when the system restarts. To start &my-app; manually,
1326 double-click on the <literal>StartPrivoxy.command</literal> icon in the
1327 <literal>/Library/Privoxy</literal> folder. Or, type this command
1332 /Library/Privoxy/StartPrivoxy.command
1336 You will be prompted for the administrator password.
1341 <sect2 id="start-amigaos">
1342 <title>AmigaOS</title>
1344 Start <application>Privoxy</application> (with RUN <>NIL:) in your
1345 <filename>startnet</filename> script (AmiTCP), in
1346 <filename>s:user-startup</filename> (RoadShow), as startup program in your
1347 startup script (Genesis), or as startup action (Miami and MiamiDx).
1348 <application>Privoxy</application> will automatically quit when you quit your
1349 TCP/IP stack (just ignore the harmless warning your TCP/IP stack may display that
1350 <application>Privoxy</application> is still running).
1354 <sect2 id="start-gentoo">
1355 <title>Gentoo</title>
1357 A script is again used. It will use the file <filename>/etc/privoxy/config
1358 </filename> as its main configuration file.
1362 /etc/init.d/privoxy start
1366 Note that <application>Privoxy</application> is not automatically started at
1367 boot time by default. You can change this with the <literal>rc-update</literal>
1372 rc-update add privoxy default
1380 See the section <link linkend="cmdoptions">Command line options</link> for
1384 must find a better place for this paragraph
1387 The included default configuration files should give a reasonable starting
1388 point. Most of the per site configuration is done in the
1389 <ulink url="actions-file.html"><quote>actions</quote></ulink> files. These are
1390 where various cookie actions are defined, ad and banner blocking, and other
1391 aspects of <application>Privoxy</application> configuration. There are several
1392 such files included, with varying levels of aggressiveness.
1396 You will probably want to keep an eye out for sites for which you may prefer
1397 persistent cookies, and add these to your actions configuration as needed. By
1398 default, most of these will be accepted only during the current browser
1399 session (aka <quote>session cookies</quote>), unless you add them to the
1400 configuration. If you want the browser to handle this instead, you will need
1401 to edit <filename>user.action</filename> (or through the web based interface)
1402 and disable this feature. If you use more than one browser, it would make
1403 more sense to let <application>Privoxy</application> handle this. In which
1404 case, the browser(s) should be set to accept all cookies.
1408 Another feature where you will probably want to define exceptions for trusted
1409 sites is the popup-killing (through the <ulink
1410 url="actions-file.html#KILL-POPUPS"><quote>+kill-popups</quote></ulink> and
1412 url="actions-file.html#FILTER-POPUPS"><quote>+filter{popups}</quote></ulink>
1413 actions), because your favorite shopping, banking, or leisure site may need
1414 popups (explained below).
1418 <application>Privoxy</application> is HTTP/1.1 compliant, but not all of
1419 the optional 1.1 features are as yet supported. In the unlikely event that
1420 you experience inexplicable problems with browsers that use HTTP/1.1 per default
1421 (like <application>Mozilla</application> or recent versions of I.E.), you might
1422 try to force HTTP/1.0 compatibility. For Mozilla, look under <literal>Edit ->
1423 Preferences -> Debug -> Networking</literal>.
1424 Alternatively, set the <quote>+downgrade-http-version</quote> config option in
1425 <filename>default.action</filename> which will downgrade your browser's HTTP
1426 requests from HTTP/1.1 to HTTP/1.0 before processing them.
1430 After running <application>Privoxy</application> for a while, you can
1431 start to fine tune the configuration to suit your personal, or site,
1432 preferences and requirements. There are many, many aspects that can
1433 be customized. <quote>Actions</quote>
1434 can be adjusted by pointing your browser to
1435 <ulink url="http://config.privoxy.org/">http://config.privoxy.org/</ulink>
1436 (shortcut: <ulink url="http://p.p/">http://p.p/</ulink>),
1437 and then follow the link to <quote>View & Change the Current Configuration</quote>.
1438 (This is an internal page and does not require Internet access.)
1442 In fact, various aspects of <application>Privoxy</application>
1443 configuration can be viewed from this page, including
1444 current configuration parameters, source code version numbers,
1445 the browser's request headers, and <quote>actions</quote> that apply
1446 to a given URL. In addition to the actions file
1447 editor mentioned above, <application>Privoxy</application> can also
1448 be turned <quote>on</quote> and <quote>off</quote> (toggled) from this page.
1452 If you encounter problems, try loading the page without
1453 <application>Privoxy</application>. If that helps, enter the URL where
1454 you have the problems into <ulink url="http://p.p/show-url-info">the browser
1455 based rule tracing utility</ulink>. See which rules apply and why, and
1456 then try turning them off for that site one after the other, until the problem
1457 is gone. When you have found the culprit, you might want to turn the rest on
1462 If the above paragraph sounds gibberish to you, you might want to <link
1463 linkend="actions-file">read more about the actions concept</link>
1464 or even dive deep into the <link linkend="actionsanat">Appendix
1469 If you can't get rid of the problem at all, think you've found a bug in
1470 Privoxy, want to propose a new feature or smarter rules, please see the
1471 section <link linkend="contact"><quote>Contacting the
1472 Developers</quote></link> below.
1477 <!-- ~~~~~ New section ~~~~~ -->
1478 <sect2 id="cmdoptions">
1479 <title>Command Line Options</title>
1481 <application>Privoxy</application> may be invoked with the following
1482 command-line options:
1490 <emphasis>--version</emphasis>
1493 Print version info and exit. Unix only.
1498 <emphasis>--help</emphasis>
1501 Print short usage info and exit. Unix only.
1506 <emphasis>--no-daemon</emphasis>
1509 Don't become a daemon, i.e. don't fork and become process group
1510 leader, and don't detach from controlling tty. Unix only.
1515 <emphasis>--pidfile FILE</emphasis>
1519 On startup, write the process ID to <emphasis>FILE</emphasis>. Delete the
1520 <emphasis>FILE</emphasis> on exit. Failure to create or delete the
1521 <emphasis>FILE</emphasis> is non-fatal. If no <emphasis>FILE</emphasis>
1522 option is given, no PID file will be used. Unix only.
1527 <emphasis>--user USER[.GROUP]</emphasis>
1531 After (optionally) writing the PID file, assume the user ID of
1532 <emphasis>USER</emphasis>, and if included the GID of GROUP. Exit if the
1533 privileges are not sufficient to do so. Unix only.
1538 <emphasis>--chroot</emphasis>
1542 Before changing to the user ID given in the <emphasis>--user</emphasis> option,
1543 chroot to that user's home directory, i.e. make the kernel pretend to the &my-app;
1544 process that the directory tree starts there. If set up carefully, this can limit
1545 the impact of possible vulnerabilities in &my-app; to the files contained in that hierarchy.
1551 <emphasis>configfile</emphasis>
1554 If no <emphasis>configfile</emphasis> is included on the command line,
1555 <application>Privoxy</application> will look for a file named
1556 <quote>config</quote> in the current directory (except on Win32
1557 where it will look for <quote>config.txt</quote> instead). Specify
1558 full path to avoid confusion. If no config file is found,
1559 <application>Privoxy</application> will fail to start.
1567 On <application>MS Windows</application> only there are two additional
1568 command-line options to allow <application>Privoxy</application> to install and
1569 run as a <emphasis>service</emphasis>. See the
1570 <link linkend="installation-pack-win">Window Installation section</link>
1578 <!-- ~ End section ~ -->
1581 <!-- ~~~~~ New section ~~~~~ -->
1582 <sect1 id="configuration"><title>Privoxy Configuration</title>
1584 All <application>Privoxy</application> configuration is stored
1585 in text files. These files can be edited with a text editor.
1586 Many important aspects of <application>Privoxy</application> can
1587 also be controlled easily with a web browser.
1591 <!-- ~~~~~ New section ~~~~~ -->
1594 <title>Controlling Privoxy with Your Web Browser</title>
1596 <application>Privoxy</application>'s user interface can be reached through the special
1597 URL <ulink url="http://config.privoxy.org/">http://config.privoxy.org/</ulink>
1598 (shortcut: <ulink url="http://p.p/">http://p.p/</ulink>),
1599 which is a built-in page and works without Internet access.
1600 You will see the following section:
1604 <!-- Needs to be put in a table and colorized -->
1607 <bridgehead renderas="sect2"> Privoxy Menu</bridgehead>
1611 ▪ <ulink url="http://config.privoxy.org/show-status">View & change the current configuration</ulink>
1614 ▪ <ulink url="http://config.privoxy.org/show-version">View the source code version numbers</ulink>
1617 ▪ <ulink url="http://config.privoxy.org/show-request">View the request headers.</ulink>
1620 ▪ <ulink url="http://config.privoxy.org/show-url-info">Look up which actions apply to a URL and why</ulink>
1623 ▪ <ulink url="http://config.privoxy.org/toggle">Toggle Privoxy on or off</ulink>
1626 ▪ <ulink url="http://www.privoxy.org/
1627 &p-version;/user-manual/">Documentation</ulink>
1635 This should be self-explanatory. Note the first item leads to an editor for the
1636 <link linkend="actions-file">actions files</link>, which is where the ad, banner,
1637 cookie, and URL blocking magic is configured as well as other advanced features of
1638 <application>Privoxy</application>. This is an easy way to adjust various
1639 aspects of <application>Privoxy</application> configuration. The actions
1640 file, and other configuration files, are explained in detail below.
1644 <quote>Toggle Privoxy On or Off</quote> is handy for sites that might
1645 have problems with your current actions and filters. You can in fact use
1646 it as a test to see whether it is <application>Privoxy</application>
1647 causing the problem or not. <application>Privoxy</application> continues
1648 to run as a proxy in this case, but all manipulation is disabled, i.e.
1649 <application>Privoxy</application> acts like a normal forwarding proxy. There
1650 is even a toggle <link linkend="bookmarklets">Bookmarklet</link> offered, so
1651 that you can toggle <application>Privoxy</application> with one click from
1657 <!-- ~ End section ~ -->
1662 <!-- ~~~~~ New section ~~~~~ -->
1664 <sect2 id="confoverview">
1665 <title>Configuration Files Overview</title>
1667 For Unix, *BSD and Linux, all configuration files are located in
1668 <filename>/etc/privoxy/</filename> by default. For MS Windows, OS/2, and
1669 AmigaOS these are all in the same directory as the
1670 <application>Privoxy</application> executable. <![%p-not-stable;[ The name
1671 and number of configuration files has changed from previous versions, and is
1672 subject to change as development progresses.]]>
1676 The installed defaults provide a reasonable starting point, though
1677 some settings may be aggressive by some standards. For the time being, the
1678 principle configuration files are:
1686 The <link linkend="config">main configuration file</link> is named <filename>config</filename>
1687 on Linux, Unix, BSD, OS/2, and AmigaOS and <filename>config.txt</filename>
1688 on Windows. This is a required file.
1694 <filename>default.action</filename> (the main <link linkend="actions-file">actions file</link>)
1695 is used to define which <quote>actions</quote> relating to banner-blocking, images, pop-ups,
1696 content modification, cookie handling etc should be applied by default. It also defines many
1697 exceptions (both positive and negative) from this default set of actions that enable
1698 <application>Privoxy</application> to selectively eliminate the junk, and only the junk, on
1699 as many websites as possible.
1702 Multiple actions files may be defined in <filename>config</filename>. These
1703 are processed in the order they are defined. Local customizations and locally
1704 preferred exceptions to the default policies as defined in
1705 <filename>default.action</filename> (which you will most probably want
1706 to define sooner or later) are probably best applied in
1707 <filename>user.action</filename>, where you can preserve them across
1708 upgrades. <filename>standard.action</filename> is only for
1709 <application>Privoxy's</application> internal use.
1712 There is also a web based editor that can be accessed from
1714 url="http://config.privoxy.org/show-status">http://config.privoxy.org/show-status</ulink>
1716 url="http://p.p/show-status">http://p.p/show-status</ulink>) for the
1717 various actions files.
1723 <quote>Filter files</quote> (the <link linkend="filter-file">filter
1724 file</link>) can be used to re-write the raw page content, including
1725 viewable text as well as embedded HTML and JavaScript, and whatever else
1726 lurks on any given web page. The filtering jobs are only pre-defined here;
1727 whether to apply them or not is up to the actions files.
1728 <filename>default.filter</filename> includes various filters made
1729 available for use by the developers. Some are much more intrusive than
1730 others, and all should be used with caution. You may define additional
1731 filter files in <filename>config</filename> as you can with
1732 actions files. We suggest <filename>user.filter</filename> for any
1733 locally defined filters or customizations.
1741 The syntax of all configuration files has remained the same throughout the
1742 3.x series. There have been enhancements, but no changes that would preclude
1743 the use of any configuration file from one version to the next. (There is
1744 one exception: <link linkend="FAST-REDIRECTS">+fast-redirects</link> which
1745 has enhanced syntax and will require updating any local configs from earlier
1750 All files use the <quote><literal>#</literal></quote> character to denote a
1751 comment (the rest of the line will be ignored) and understand line continuation
1752 through placing a backslash ("<literal>\</literal>") as the very last character
1753 in a line. If the <literal>#</literal> is preceded by a backslash, it looses
1754 its special function. Placing a <literal>#</literal> in front of an otherwise
1755 valid configuration line to prevent it from being interpreted is called "commenting
1756 out" that line. Blank lines are ignored.
1760 The actions files and filter files
1761 can use Perl style <link linkend="regex">regular expressions</link> for
1762 maximum flexibility.
1766 After making any changes, there is no need to restart
1767 <application>Privoxy</application> in order for the changes to take
1768 effect. <application>Privoxy</application> detects such changes
1769 automatically. Note, however, that it may take one or two additional
1770 requests for the change to take effect. When changing the listening address
1771 of <application>Privoxy</application>, these <quote>wake up</quote> requests
1772 must obviously be sent to the <emphasis>old</emphasis> listening address.
1777 While under development, the configuration content is subject to change.
1778 The below documentation may not be accurate by the time you read this.
1779 Also, what constitutes a <quote>default</quote> setting, may change, so
1780 please check all your configuration files on important issues.
1786 <!-- ~ End section ~ -->
1789 <!-- ~~~~~~~~ New section Header ~~~~~~~~~ -->
1791 <!-- **************************************************** -->
1792 <!-- Include config.sgml here -->
1793 <!-- This is where the entire config file is detailed. -->
1795 <!-- end include -->
1798 <!-- ~ End section ~ -->
1802 <!-- ~~~~~~~~ New section Header ~~~~~~~~~ -->
1804 <sect1 id="actions-file"><title>Actions Files</title>
1807 The actions files are used to define what <emphasis>actions</emphasis>
1808 <application>Privoxy</application> takes for which URLs, and thus determines
1809 how ad images, cookies and various other aspects of HTTP content and
1810 transactions are handled, and on which sites (or even parts thereof).
1811 There are a number of such actions, with a wide range of functionality.
1812 Each action does something a little different.
1813 These actions give us a veritable arsenal of tools with which to exert
1814 our control, preferences and independence. Actions can be combined so that
1815 their effects are aggregated when applied against a given set of URLs.
1819 are three action files included with <application>Privoxy</application> with
1827 <filename>default.action</filename> - is the primary action file
1828 that sets the initial values for all actions. It is intended to
1829 provide a base level of functionality for
1830 <application>Privoxy's</application> array of features. So it is
1831 a set of broad rules that should work reasonably well as-is for most users.
1832 This is the file that the developers are keeping updated, and <link
1833 linkend="installation-keepupdated">making available to users</link>.
1834 The user's preferences as set in <filename>standard.action</filename>,
1835 e.g. either <literal>Cautious</literal> (the default),
1836 <literal>Medium</literal>, or <literal>Advanced</literal> (see
1842 <filename>user.action</filename> - is intended to be for local site
1843 preferences and exceptions. As an example, if your ISP or your bank
1844 has specific requirements, and need special handling, this kind of
1845 thing should go here. This file will not be upgraded.
1850 <filename>standard.action</filename> - is used only by the web based editor
1851 at <ulink url="http://config.privoxy.org/edit-actions-list?f=default">
1852 http://config.privoxy.org/edit-actions-list?f=default</ulink>,
1853 to set various pre-defined sets of rules for the default actions section
1854 in <filename>default.action</filename>.
1857 <guibutton>Edit</guibutton> <guibutton>Set to Cautious</guibutton> <guibutton>Set to Medium</guibutton> <guibutton>Set to Advanced</guibutton>
1860 These have increasing levels of aggressiveness <emphasis>and have no
1861 influence on your browsing unless you select them explicitly in the
1862 editor</emphasis>. A default installation should be pre-set to
1863 <literal>Cautious</literal> (versions prior to 3.0.5 were set to
1864 <literal>Medium</literal>). New users should try this for a while before
1865 adjusting the settings to more aggressive levels. The more aggressive
1866 the settings, then the more likelihood there is of problems such as sites
1867 not working as they should.
1870 The <guibutton>Edit</guibutton> button allows you to turn each
1871 action on/off individually for fine-tuning. The <guibutton>Cautious</guibutton>
1872 button changes the actions list to low/safe settings which will activate
1873 ad blocking and a minimal set of &my-app;'s features, and subsequently
1874 there will be less of a chance for accidental problems. The
1875 <guibutton>Medium</guibutton> button sets the list to a medium level of
1876 other features and a low level set of privacy features. The
1877 <guibutton>Advanced</guibutton> button sets the list to a high level of
1878 ad blocking and medium level of privacy. See the chart below. The latter
1879 three buttons over-ride any changes via with the
1880 <guibutton>Edit</guibutton> button. More fine-tuning can be done in the
1881 lower sections of this internal page.
1884 It is not recommend to edit the <filename>standard.action</filename> file
1888 The default profiles, and their associated actions, as pre-defined in
1889 <filename>standard.action</filename> are:
1892 <table frame=all><title>Default Configurations</title>
1893 <tgroup cols=4 align=left colsep=1 rowsep=1>
1894 <colspec colname=c1>
1895 <colspec colname=c2>
1896 <colspec colname=c3>
1897 <colspec colname=c4>
1900 <entry>Feature</entry>
1901 <entry>Cautious</entry>
1902 <entry>Medium</entry>
1903 <entry>Advanced</entry>
1908 <!-- <entry>f1</entry> -->
1909 <!-- <entry>f2</entry> -->
1910 <!-- <entry>f3</entry> -->
1911 <!-- <entry>f4</entry> -->
1917 <entry>Ad-blocking Aggressiveness</entry>
1918 <entry>medium</entry>
1924 <entry>Ad-filtering by size</entry>
1931 <entry>Ad-filtering by link</entry>
1937 <entry>Pop-up killing</entry>
1938 <entry>blocks only</entry>
1939 <entry>blocks only</entry>
1940 <entry>blocks only</entry>
1944 <entry>Privacy Features</entry>
1946 <entry>medium</entry>
1947 <entry>medium/high</entry>
1951 <entry>Cookie handling</entry>
1953 <entry>session-only</entry>
1958 <entry>Referer forging</entry>
1966 <entry>GIF de-animation</entry>
1974 <entry>Fast redirects</entry>
1981 <entry>HTML taming</entry>
1988 <entry>JavaScript taming</entry>
1995 <entry>Web-bug killing</entry>
2002 <entry>Image tag reordering</entry>
2018 The list of actions files to be used are defined in the main configuration
2019 file, and are processed in the order they are defined (e.g.
2020 <filename>default.action</filename> is typically processed before
2021 <filename>user.action</filename>). The content of these can all be viewed and
2023 url="http://config.privoxy.org/show-status">http://config.privoxy.org/show-status</ulink>.
2024 The over-riding principle when applying actions, is that the last action that
2025 matches a given URL, wins. The broadest, most general rules go first
2026 (defined in <filename>default.action</filename>),
2027 followed by any exceptions (typically also in
2028 <filename>default.action</filename>), which are then followed lastly by any
2029 local preferences (typically in <emphasis>user</emphasis><filename>.action</filename>).
2030 Generally, <filename>user.action</filename> has the last word.
2034 An actions file typically has multiple sections. If you want to use
2035 <quote>aliases</quote> in an actions file, you have to place the (optional)
2036 <link linkend="aliases">alias section</link> at the top of that file.
2037 Then comes the default set of rules which will apply universally to all
2038 sites and pages (be <emphasis>very careful</emphasis> with using such a
2039 universal set in <filename>user.action</filename> or any other actions file after
2040 <filename>default.action</filename>, because it will override the result
2041 from consulting any previous file). And then below that,
2042 exceptions to the defined universal policies. You can regard
2043 <filename>user.action</filename> as an appendix to <filename>default.action</filename>,
2044 with the advantage that is a separate file, which makes preserving your
2045 personal settings across <application>Privoxy</application> upgrades easier.
2049 Actions can be used to block anything you want, including ads, banners, or
2050 just some obnoxious URL that you would rather not see. Cookies can be accepted
2051 or rejected, or accepted only during the current browser session (i.e. not
2052 written to disk), content can be modified, JavaScripts tamed, user-tracking
2053 fooled, and much more. See below for a <link linkend="actions">complete list
2057 <!-- ~~~~~ New section ~~~~~ -->
2059 <title>Finding the Right Mix</title>
2061 Note that some <link linkend="actions">actions</link>, like cookie suppression
2062 or script disabling, may render some sites unusable that rely on these
2063 techniques to work properly. Finding the right mix of actions is not always easy and
2064 certainly a matter of personal taste. And, things can always change, requiring
2065 refinements in the configuration. In general, it can be said that the more
2066 <quote>aggressive</quote> your default settings (in the top section of the
2067 actions file) are, the more exceptions for <quote>trusted</quote> sites you
2068 will have to make later. If, for example, you want to crunch all cookies per
2069 default, you'll have to make exceptions from that rule for sites that you
2070 regularly use and that require cookies for actually useful purposes, like maybe
2071 your bank, favorite shop, or newspaper.
2075 We have tried to provide you with reasonable rules to start from in the
2076 distribution actions files. But there is no general rule of thumb on these
2077 things. There just are too many variables, and sites are constantly changing.
2078 Sooner or later you will want to change the rules (and read this chapter again :).
2082 <!-- ~~~~~ New section ~~~~~ -->
2084 <title>How to Edit</title>
2086 The easiest way to edit the actions files is with a browser by
2087 using our browser-based editor, which can be reached from <ulink
2088 url="http://config.privoxy.org/show-status">http://config.privoxy.org/show-status</ulink>.
2089 The editor allows both fine-grained control over every single feature on a
2090 per-URL basis, and easy choosing from wholesale sets of defaults like
2091 <quote>Cautious</quote>, <quote>Medium</quote> or <quote>Advanced</quote>.
2092 Warning: the <quote>Advanced</quote> setting is more aggressive, and
2093 will be more likely to cause problems for some sites. Experienced users only!
2097 If you prefer plain text editing to GUIs, you can of course also directly edit the
2098 the actions files with your favorite text editor. Look at
2099 <filename>default.action</filename> which is richly commented with many
2105 <sect2 id="actions-apply">
2106 <title>How Actions are Applied to Requests</title>
2108 Actions files are divided into sections. There are special sections,
2109 like the <quote><link linkend="aliases">alias</link></quote> sections which will
2110 be discussed later. For now let's concentrate on regular sections: They have a
2111 heading line (often split up to multiple lines for readability) which consist
2112 of a list of actions, separated by whitespace and enclosed in curly braces.
2113 Below that, there is a list of URL and tag patterns, each on a separate line.
2117 To determine which actions apply to a request, the URL of the request is
2118 compared to all URL patterns in each <quote>action file</quote>.
2119 Every time it matches, the list of applicable actions for the request is
2120 incrementally updated, using the heading of the section in which the
2121 pattern is located. The same is done again for tags and tag patterns later on.
2125 If multiple applying sections set the same action differently,
2126 the last match wins. If not, the effects are aggregated.
2127 E.g. a URL might match a regular section with a heading line of <literal>{
2128 +<link linkend="handle-as-image">handle-as-image</link> }</literal>,
2129 then later another one with just <literal>{
2130 +<link linkend="block">block</link> }</literal>, resulting
2131 in <emphasis>both</emphasis> actions to apply. And there may well be
2132 cases where you will want to combine actions together. Such a section then
2138 { +<literal>handle-as-image</literal> +<literal>block</literal> }
2139 # Block these as if they were images. Send no block page.
2141 media.example.com/.*banners
2142 .example.com/images/ads/</screen>
2146 You can trace this process for URL patterns and any given URL by visiting <ulink
2147 url="http://config.privoxy.org/show-url-info">http://config.privoxy.org/show-url-info</ulink>.
2151 Examples and more detail on this is provided in the Appendix, <link linkend="ACTIONSANAT">
2152 Troubleshooting: Anatomy of an Action</link> section.
2156 <!-- ~~~~~ New section ~~~~~ -->
2157 <sect2 id="af-patterns">
2158 <title>Patterns</title>
2160 As mentioned, <application>Privoxy</application> uses <quote>patterns</quote>
2161 to determine what <emphasis>actions</emphasis> might apply to which sites and
2162 pages your browser attempts to access. These <quote>patterns</quote> use wild
2163 card type <emphasis>pattern</emphasis> matching to achieve a high degree of
2164 flexibility. This allows one expression to be expanded and potentially match
2165 against many similar patterns.
2169 Generally, a URL pattern has the form
2170 <literal><domain>/<path></literal>, where both the
2171 <literal><domain></literal> and <literal><path></literal> are
2172 optional. (This is why the special <literal>/</literal> pattern matches all
2173 URLs). Note that the protocol portion of the URL pattern (e.g.
2174 <literal>http://</literal>) should <emphasis>not</emphasis> be included in
2175 the pattern. This is assumed already!
2178 The pattern matching syntax is different for the domain and path parts of
2179 the URL. The domain part uses a simple globbing type matching technique,
2180 while the path part uses a more flexible
2181 <ulink url="http://en.wikipedia.org/wiki/Regular_expressions"><quote>Regular
2182 Expressions (PCRE)</quote></ulink> based syntax.
2187 <term><literal>www.example.com/</literal></term>
2190 is a domain-only pattern and will match any request to <literal>www.example.com</literal>,
2191 regardless of which document on that server is requested. So ALL pages in
2192 this domain would be covered by the scope of this action. Note that a
2193 simple <literal>example.com</literal> is different and would NOT match.
2198 <term><literal>www.example.com</literal></term>
2201 means exactly the same. For domain-only patterns, the trailing <literal>/</literal> may
2207 <term><literal>www.example.com/index.html</literal></term>
2210 matches only the single document <literal>/index.html</literal>
2211 on <literal>www.example.com</literal>.
2216 <term><literal>/index.html</literal></term>
2219 matches the document <literal>/index.html</literal>, regardless of the domain,
2220 i.e. on <emphasis>any</emphasis> web server anywhere.
2225 <term><literal>index.html</literal></term>
2228 matches nothing, since it would be interpreted as a domain name and
2229 there is no top-level domain called <literal>.html</literal>. So its
2237 <!-- ~~~~~ New section ~~~~~ -->
2238 <sect3><title>The Domain Pattern</title>
2241 The matching of the domain part offers some flexible options: if the
2242 domain starts or ends with a dot, it becomes unanchored at that end.
2248 <term><literal>.example.com</literal></term>
2251 matches any domain that <emphasis>ENDS</emphasis> in
2252 <literal>.example.com</literal>
2257 <term><literal>www.</literal></term>
2260 matches any domain that <emphasis>STARTS</emphasis> with
2261 <literal>www.</literal>
2266 <term><literal>.example.</literal></term>
2269 matches any domain that <emphasis>CONTAINS</emphasis> <literal>.example.</literal>.
2270 And, by the way, also included would be any files or documents that exist
2271 within that domain since no path limitations are specified. (Correctly
2272 speaking: It matches any FQDN that contains <literal>example</literal> as
2273 a domain.) This might be <literal>www.example.com</literal>,
2274 <literal>news.example.de</literal>, or
2275 <literal>www.example.net/cgi/testing.pl</literal> for instance. All these
2283 Additionally, there are wild-cards that you can use in the domain names
2284 themselves. These work similarly to shell globbing type wild-cards:
2285 <quote>*</quote> represents zero or more arbitrary characters (this is
2287 <ulink url="http://en.wikipedia.org/wiki/Regular_expressions"><quote>Regular
2288 Expression</quote></ulink> based syntax of <quote>.*</quote>),
2289 <quote>?</quote> represents any single character (this is equivalent to the
2290 regular expression syntax of a simple <quote>.</quote>), and you can define
2291 <quote>character classes</quote> in square brackets which is similar to
2292 the same regular expression technique. All of this can be freely mixed:
2297 <term><literal>ad*.example.com</literal></term>
2300 matches <quote>adserver.example.com</quote>,
2301 <quote>ads.example.com</quote>, etc but not <quote>sfads.example.com</quote>
2306 <term><literal>*ad*.example.com</literal></term>
2309 matches all of the above, and then some.
2314 <term><literal>.?pix.com</literal></term>
2317 matches <literal>www.ipix.com</literal>,
2318 <literal>pictures.epix.com</literal>, <literal>a.b.c.d.e.upix.com</literal> etc.
2323 <term><literal>www[1-9a-ez].example.c*</literal></term>
2326 matches <literal>www1.example.com</literal>,
2327 <literal>www4.example.cc</literal>, <literal>wwwd.example.cy</literal>,
2328 <literal>wwwz.example.com</literal> etc., but <emphasis>not</emphasis>
2329 <literal>wwww.example.com</literal>.
2336 While flexible, this is not the sophistication of full regular expression based syntax.
2341 <!-- ~ End section ~ -->
2344 <!-- ~~~~~ New section ~~~~~ -->
2345 <sect3><title>The Path Pattern</title>
2348 <application>Privoxy</application> uses Perl compatible (PCRE)
2349 <ulink url="http://en.wikipedia.org/wiki/Regular_expressions"><quote>Regular
2350 Expression</quote></ulink> based syntax
2351 (through the <ulink url="http://www.pcre.org/">PCRE</ulink> library) for
2352 matching the path portion (after the slash), and is thus more flexible.
2356 There is an <link linkend="regex">Appendix</link> with a brief quick-start into regular
2357 expressions, and full (very technical) documentation on PCRE regex syntax is available on-line
2358 at <ulink url="http://www.pcre.org/man.txt">http://www.pcre.org/man.txt</ulink>.
2359 You might also find the Perl man page on regular expressions (<literal>man perlre</literal>)
2360 useful, which is available on-line at <ulink
2361 url="http://perldoc.perl.org/perlre.html">http://perldoc.perl.org/perlre.html</ulink>.
2365 Note that the path pattern is automatically left-anchored at the <quote>/</quote>,
2366 i.e. it matches as if it would start with a <quote>^</quote> (regular expression speak
2367 for the beginning of a line).
2371 Please also note that matching in the path is <emphasis>CASE INSENSITIVE</emphasis>
2372 by default, but you can switch to case sensitive at any point in the pattern by using the
2373 <quote>(?-i)</quote> switch: <literal>www.example.com/(?-i)PaTtErN.*</literal> will match
2374 only documents whose path starts with <literal>PaTtErN</literal> in
2375 <emphasis>exactly</emphasis> this capitalization.
2380 <term><literal>.example.com/.*</literal></term>
2383 Is equivalent to just <quote>.example.com</quote>, since any documents
2384 within that domain are matched with or without the <quote>.*</quote>
2385 regular expression. This is redundant
2390 <term><literal>.example.com/.*/index.html</literal></term>
2393 Will match any page in the domain of <quote>example.com</quote> that is
2394 named <quote>index.html</quote>, and that is part of some path. For
2395 example, it matches <quote>www.example.com/testing/index.html</quote> but
2396 NOT <quote>www.example.com/index.html</quote> because the regular
2397 expression called for at least two <quote>/'s</quote>, thus the path
2398 requirement. It also would match
2399 <quote>www.example.com/testing/index_html</quote>, because of the
2400 special meta-character <quote>.</quote>.
2405 <term><literal>.example.com/(.*/)?index\.html</literal></term>
2408 This regular expression is conditional so it will match any page
2409 named <quote>index.html</quote> regardless of path which in this case can
2410 have one or more <quote>/'s</quote>. And this one must contain exactly
2411 <quote>.html</quote> (but does not have to end with that!).
2416 <term><literal>.example.com/(.*/)(ads|banners?|junk)</literal></term>
2419 This regular expression will match any path of <quote>example.com</quote>
2420 that contains any of the words <quote>ads</quote>, <quote>banner</quote>,
2421 <quote>banners</quote> (because of the <quote>?</quote>) or <quote>junk</quote>.
2422 The path does not have to end in these words, just contain them.
2427 <term><literal>.example.com/(.*/)(ads|banners?|junk)/.*\.(jpe?g|gif|png)$</literal></term>
2430 This is very much the same as above, except now it must end in either
2431 <quote>.jpg</quote>, <quote>.jpeg</quote>, <quote>.gif</quote> or <quote>.png</quote>. So this
2432 one is limited to common image formats.
2439 There are many, many good examples to be found in <filename>default.action</filename>,
2440 and more tutorials below in <link linkend="regex">Appendix on regular expressions</link>.
2445 <!-- ~ End section ~ -->
2448 <!-- ~~~~~ New section ~~~~~ -->
2449 <sect3 id="tag-pattern"><title>The Tag Pattern</title>
2452 Tag patterns are used to change the applying actions based on the
2453 request's tags. Tags can be created with either the
2454 <link linkend="CLIENT-HEADER-FILTER">client-header-tagger</link>
2455 or the <link linkend="SERVER-HEADER-FILTER">server-header-tagger</link> action.
2459 Tag patterns have to start with <quote>TAG:</quote>, so &my-app;
2460 can tell them apart from URL patterns. Everything after the colon
2461 including white space, is interpreted as a regular expression with
2462 path patterns syntax, except that tag patterns aren't left-anchored
2463 automatically (Privoxy doesn't silently add a <quote>^</quote>,
2464 you have to do it yourself if you need it).
2468 To match all requests that are tagged with <quote>foo</quote>
2469 your pattern line should be <quote>TAG:^foo$</quote>,
2470 <quote>TAG:foo</quote> would work as well, but it would also
2471 match requests whose tags contain <quote>foo</quote> somewhere.
2475 Sections can contain URL and tag patterns at the same time,
2476 but tag patterns are checked after the URL patterns and thus
2477 always overrule them, even if they are located before the URL patterns.
2481 Once a new tag is added, Privoxy checks right away if it's matched by one
2482 of the tag patterns and updates the action settings accordingly. As a result
2483 tags can be used to activate other tagger actions, as long as these other
2484 taggers look for headers that haven't already be parsed.
2488 For example you could tag client requests which use the POST method,
2489 use this tag to activate another tagger that adds a tag if cookies
2490 are send, and then block based on the cookie tag. However if you'd
2491 reverse the position of the described taggers, and activated the method
2492 tagger based on the cookie tagger, no method tags would be created.
2493 The method tagger would look for the request line, but at the time
2494 the cookie tag is created the request line has already been parsed.
2498 While this is a limitation you should be aware of, this kind of
2499 indirection is seldom needed anyway and even the example doesn't
2500 make too much sense.
2507 <!-- ~ End section ~ -->
2510 <!-- ~~~~~ New section ~~~~~ -->
2512 <sect2 id="actions">
2513 <title>Actions</title>
2515 All actions are disabled by default, until they are explicitly enabled
2516 somewhere in an actions file. Actions are turned on if preceded with a
2517 <quote>+</quote>, and turned off if preceded with a <quote>-</quote>. So a
2518 <literal>+action</literal> means <quote>do that action</quote>, e.g.
2519 <literal>+block</literal> means <quote>please block URLs that match the
2520 following patterns</quote>, and <literal>-block</literal> means <quote>don't
2521 block URLs that match the following patterns, even if <literal>+block</literal>
2522 previously applied.</quote>
2527 Again, actions are invoked by placing them on a line, enclosed in curly braces and
2528 separated by whitespace, like in
2529 <literal>{+some-action -some-other-action{some-parameter}}</literal>,
2530 followed by a list of URL patterns, one per line, to which they apply.
2531 Together, the actions line and the following pattern lines make up a section
2532 of the actions file.
2536 Actions fall into three categories:
2543 Boolean, i.e the action can only be <quote>enabled</quote> or
2544 <quote>disabled</quote>. Syntax:
2548 +<replaceable class="function">name</replaceable> # enable action <replaceable class="parameter">name</replaceable>
2549 -<replaceable class="function">name</replaceable> # disable action <replaceable class="parameter">name</replaceable></screen>
2552 Example: <literal>+block</literal>
2559 Parameterized, where some value is required in order to enable this type of action.
2564 +<replaceable class="function">name</replaceable>{<replaceable class="parameter">param</replaceable>} # enable action and set parameter to <replaceable class="parameter">param</replaceable>,
2565 # overwriting parameter from previous match if necessary
2566 -<replaceable class="function">name</replaceable> # disable action. The parameter can be omitted</screen>
2569 Note that if the URL matches multiple positive forms of a parameterized action,
2570 the last match wins, i.e. the params from earlier matches are simply ignored.
2573 Example: <literal>+hide-user-agent{ Mozilla 1.0 }</literal>
2579 Multi-value. These look exactly like parameterized actions,
2580 but they behave differently: If the action applies multiple times to the
2581 same URL, but with different parameters, <emphasis>all</emphasis> the parameters
2582 from <emphasis>all</emphasis> matches are remembered. This is used for actions
2583 that can be executed for the same request repeatedly, like adding multiple
2584 headers, or filtering through multiple filters. Syntax:
2588 +<replaceable class="function">name</replaceable>{<replaceable class="parameter">param</replaceable>} # enable action and add <replaceable class="parameter">param</replaceable> to the list of parameters
2589 -<replaceable class="function">name</replaceable>{<replaceable class="parameter">param</replaceable>} # remove the parameter <replaceable class="parameter">param</replaceable> from the list of parameters
2590 # If it was the last one left, disable the action.
2591 <replaceable class="parameter">-name</replaceable> # disable this action completely and remove all parameters from the list</screen>
2594 Examples: <literal>+add-header{X-Fun-Header: Some text}</literal> and
2595 <literal>+filter{html-annoyances}</literal>
2603 If nothing is specified in any actions file, no <quote>actions</quote> are
2604 taken. So in this case <application>Privoxy</application> would just be a
2605 normal, non-blocking, non-anonymizing proxy. You must specifically enable the
2606 privacy and blocking features you need (although the provided default actions
2607 files will give a good starting point).
2611 Later defined actions always over-ride earlier ones. So exceptions
2612 to any rules you make, should come in the latter part of the file (or
2613 in a file that is processed later when using multiple actions files such
2614 as <filename>user.action</filename>). For multi-valued actions, the actions
2615 are applied in the order they are specified. Actions files are processed in
2616 the order they are defined in <filename>config</filename> (the default
2617 installation has three actions files). It also quite possible for any given
2618 URL to match more than one <quote>pattern</quote> (because of wildcards and
2619 regular expressions), and thus to trigger more than one set of actions! Last
2623 <!-- start actions listing -->
2625 The list of valid <application>Privoxy</application> actions are:
2629 <!-- ********************************************************** -->
2630 <!-- Please note the below defined actions use id's that are -->
2631 <!-- probably linked from other places, so please don't change. -->
2633 <!-- ********************************************************** -->
2636 <!-- ~~~~~ New section ~~~~~ -->
2638 <sect3 renderas="sect4" id="add-header">
2639 <title>add-header</title>
2643 <term>Typical use:</term>
2645 <para>Confuse log analysis, custom applications</para>
2650 <term>Effect:</term>
2653 Sends a user defined HTTP header to the web server.
2660 <!-- boolean, parameterized, Multi-value -->
2662 <para>Multi-value.</para>
2667 <term>Parameter:</term>
2670 Any string value is possible. Validity of the defined HTTP headers is not checked.
2671 It is recommended that you use the <quote><literal>X-</literal></quote> prefix
2681 This action may be specified multiple times, in order to define multiple
2682 headers. This is rarely needed for the typical user. If you don't know what
2683 <quote>HTTP headers</quote> are, you definitely don't need to worry about this
2690 <term>Example usage:</term>
2693 <screen>+add-header{X-User-Tracking: sucks}</screen>
2701 <!-- ~~~~~ New section ~~~~~ -->
2702 <sect3 renderas="sect4" id="block">
2703 <title>block</title>
2707 <term>Typical use:</term>
2709 <para>Block ads or other unwanted content</para>
2714 <term>Effect:</term>
2717 Requests for URLs to which this action applies are blocked, i.e. the
2718 requests are trapped by &my-app; and the requested URL is never retrieved,
2719 but is answered locally with a substitute page or image, as determined by
2721 linkend="handle-as-image">handle-as-image</link></literal>,
2723 linkend="set-image-blocker">set-image-blocker</link></literal>, and
2725 linkend="handle-as-empty-document">handle-as-empty-document</link></literal> actions.
2733 <!-- boolean, parameterized, Multi-value -->
2735 <para>Boolean.</para>
2740 <term>Parameter:</term>
2750 <application>Privoxy</application> sends a special <quote>BLOCKED</quote> page
2751 for requests to blocked pages. This page contains links to find out why the request
2752 was blocked, and a click-through to the blocked content (the latter only if compiled with the
2753 force feature enabled). The <quote>BLOCKED</quote> page adapts to the available
2754 screen space -- it displays full-blown if space allows, or miniaturized and text-only
2755 if loaded into a small frame or window. If you are using <application>Privoxy</application>
2756 right now, you can take a look at the
2757 <ulink url="http://ads.bannerserver.example.com/nasty-ads/sponsor.html"><quote>BLOCKED</quote>
2761 A very important exception occurs if <emphasis>both</emphasis>
2762 <literal>block</literal> and <literal><link linkend="handle-as-image">handle-as-image</link></literal>,
2763 apply to the same request: it will then be replaced by an image. If
2764 <literal><link linkend="set-image-blocker">set-image-blocker</link></literal>
2765 (see below) also applies, the type of image will be determined by its parameter,
2766 if not, the standard checkerboard pattern is sent.
2769 It is important to understand this process, in order
2770 to understand how <application>Privoxy</application> deals with
2771 ads and other unwanted content. Blocking is a core feature, and one
2772 upon which various other features depend.
2775 The <literal><link linkend="filter">filter</link></literal>
2776 action can perform a very similar task, by <quote>blocking</quote>
2777 banner images and other content through rewriting the relevant URLs in the
2778 document's HTML source, so they don't get requested in the first place.
2779 Note that this is a totally different technique, and it's easy to confuse the two.
2785 <term>Example usage (section):</term>
2789 # Block and replace with "blocked" page
2790 .nasty-stuff.example.com
2792 {+block +handle-as-image}
2793 # Block and replace with image
2797 {+block +handle-as-empty-document}
2798 # Block and then ignore
2799 adserver.exampleclick.net/.*\.js$</screen>
2809 <!-- ~~~~~ New section ~~~~~ -->
2810 <sect3 renderas="sect4" id="client-header-filter">
2811 <title>client-header-filter</title>
2815 <term>Typical use:</term>
2818 Rewrite or remove single client headers.
2824 <term>Effect:</term>
2827 All client headers to which this action applies are filtered on-the-fly through
2828 the specified regular expression based substitutions.
2835 <!-- boolean, parameterized, Multi-value -->
2837 <para>Parameterized.</para>
2842 <term>Parameter:</term>
2845 The name of a client-header filter, as defined in one of the
2846 <link linkend="filter-file">filter files</link>.
2855 Client-header filters are applied to each header on its own, not to
2856 all at once. This makes it easier to diagnose problems, but on the downside
2857 you can't write filters that only change header x if header y's value is z.
2858 You can do that by using tags though.
2861 Client-header filters are executed after the other header actions have finished
2862 and use their output as input.
2865 Please refer to the <link linkend="filter-file">filter file chapter</link>
2866 to learn which client-header filters are available by default, and how to
2873 <term>Example usage (section):</term>
2877 {+client-header-filter{hide-tor-exit-notation}}
2888 <!-- ~~~~~ New section ~~~~~ -->
2889 <sect3 renderas="sect4" id="client-header-tagger">
2890 <title>client-header-tagger</title>
2894 <term>Typical use:</term>
2897 Block requests based on their headers.
2903 <term>Effect:</term>
2906 Client headers to which this action applies are filtered on-the-fly through
2907 the specified regular expression based substitutions, the result is used as
2915 <!-- boolean, parameterized, Multi-value -->
2917 <para>Parameterized.</para>
2922 <term>Parameter:</term>
2925 The name of a client-header tagger, as defined in one of the
2926 <link linkend="filter-file">filter files</link>.
2935 Client-header taggers are applied to each header on its own,
2936 and as the header isn't modified, each tagger <quote>sees</quote>
2940 Client-header taggers are the first actions that are executed
2941 and their tags can be used to control every other action.
2947 <term>Example usage (section):</term>
2951 # Tag every request with the User-Agent header
2952 {+client-header-filter{user-agent}}
2963 <!-- ~~~~~ New section ~~~~~ -->
2964 <sect3 renderas="sect4" id="content-type-overwrite">
2968 <title>content-type-overwrite</title>
2972 <term>Typical use:</term>
2974 <para>Stop useless download menus from popping up, or change the browser's rendering mode</para>
2979 <term>Effect:</term>
2982 Replaces the <quote>Content-Type:</quote> HTTP server header.
2989 <!-- Boolean, Parameterized, Multi-value -->
2991 <para>Parameterized.</para>
2996 <term>Parameter:</term>
3008 The <quote>Content-Type:</quote> HTTP server header is used by the
3009 browser to decide what to do with the document. The value of this
3010 header can cause the browser to open a download menu instead of
3011 displaying the document by itself, even if the document's format is
3012 supported by the browser.
3015 The declared content type can also affect which rendering mode
3016 the browser chooses. If XHTML is delivered as <quote>text/html</quote>,
3017 many browsers treat it as yet another broken HTML document.
3018 If it is send as <quote>application/xml</quote>, browsers with
3019 XHTML support will only display it, if the syntax is correct.
3022 If you see a web site that proudly uses XHTML buttons, but sets
3023 <quote>Content-Type: text/html</quote>, you can use &my-app;
3024 to overwrite it with <quote>application/xml</quote> and validate
3025 the web master's claim inside your XHTML-supporting browser.
3026 If the syntax is incorrect, the browser will complain loudly.
3029 You can also go the opposite direction: if your browser prints
3030 error messages instead of rendering a document falsely declared
3031 as XHTML, you can overwrite the content type with
3032 <quote>text/html</quote> and have it rendered as broken HTML document.
3035 By default <literal>content-type-overwrite</literal> only replaces
3036 <quote>Content-Type:</quote> headers that look like some kind of text.
3037 If you want to overwrite it unconditionally, you have to combine it with
3038 <literal><link linkend="force-text-mode">force-text-mode</link></literal>.
3039 This limitation exists for a reason, think twice before circumventing it.
3042 Most of the time it's easier to replace this action with a custom
3043 <literal><link linkend="server-header-filter">server-header filter</link></literal>.
3044 It allows you to activate it for every document of a certain site and it will still
3045 only replace the content types you aimed at.
3048 Of course you can apply <literal>content-type-overwrite</literal>
3049 to a whole site and then make URL based exceptions, but it's a lot
3050 more work to get the same precision.
3056 <term>Example usage (sections):</term>
3059 <screen># Check if www.example.net/ really uses valid XHTML
3060 { +content-type-overwrite{application/xml} }
3063 # but leave the content type unmodified if the URL looks like a style sheet
3064 {-content-type-overwrite}
3065 www.example.net/.*\.css$
3066 www.example.net/.*style
3075 <!-- ~~~~~ New section ~~~~~ -->
3076 <sect3 renderas="sect4" id="crunch-client-header">
3080 <title>crunch-client-header</title>
3084 <term>Typical use:</term>
3086 <para>Remove a client header <application>Privoxy</application> has no dedicated action for.</para>
3091 <term>Effect:</term>
3094 Deletes every header sent by the client that contains the string the user supplied as parameter.
3101 <!-- Boolean, Parameterized, Multi-value -->
3103 <para>Parameterized.</para>
3108 <term>Parameter:</term>
3120 This action allows you to block client headers for which no dedicated
3121 <application>Privoxy</application> action exists.
3122 <application>Privoxy</application> will remove every client header that
3123 contains the string you supplied as parameter.
3126 Regular expressions are <emphasis>not supported</emphasis> and you can't
3127 use this action to block different headers in the same request, unless
3128 they contain the same string.
3131 <literal>crunch-client-header</literal> is only meant for quick tests.
3132 If you have to block several different headers, or only want to modify
3133 parts of them, you should use a
3134 <literal><link linkend="client-header-filter">client-header filter</link></literal>.
3138 Don't block any header without understanding the consequences.
3145 <term>Example usage (section):</term>
3148 <screen># Block the non-existent "Privacy-Violation:" client header
3149 { +crunch-client-header{Privacy-Violation:} }
3159 <!-- ~~~~~ New section ~~~~~ -->
3160 <sect3 renderas="sect4" id="crunch-if-none-match">
3161 <title>crunch-if-none-match</title>
3167 <term>Typical use:</term>
3169 <para>Prevent yet another way to track the user's steps between sessions.</para>
3174 <term>Effect:</term>
3177 Deletes the <quote>If-None-Match:</quote> HTTP client header.
3184 <!-- Boolean, Parameterized, Multi-value -->
3186 <para>Boolean.</para>
3191 <term>Parameter:</term>
3203 Removing the <quote>If-None-Match:</quote> HTTP client header
3204 is useful for filter testing, where you want to force a real
3205 reload instead of getting status code <quote>304</quote> which
3206 would cause the browser to use a cached copy of the page.
3209 It is also useful to make sure the header isn't used as a cookie
3213 Blocking the <quote>If-None-Match:</quote> header shouldn't cause any
3214 caching problems, as long as the <quote>If-Modified-Since:</quote> header
3215 isn't blocked as well.
3218 It is recommended to use this action together with
3219 <literal><link linkend="hide-if-modified-since">hide-if-modified-since</link></literal>
3221 <literal><link linkend="overwrite-last-modified">overwrite-last-modified</link></literal>.
3227 <term>Example usage (section):</term>
3230 <screen># Let the browser revalidate cached documents without being tracked across sessions
3231 { +hide-if-modified-since{-60} \
3232 +overwrite-last-modified{randomize} \
3233 +crunch-if-none-match}
3242 <!-- ~~~~~ New section ~~~~~ -->
3243 <sect3 renderas="sect4" id="crunch-incoming-cookies">
3244 <title>crunch-incoming-cookies</title>
3248 <term>Typical use:</term>
3251 Prevent the web server from setting any cookies on your system
3257 <term>Effect:</term>
3260 Deletes any <quote>Set-Cookie:</quote> HTTP headers from server replies.
3267 <!-- Boolean, Parameterized, Multi-value -->
3269 <para>Boolean.</para>
3274 <term>Parameter:</term>
3286 This action is only concerned with <emphasis>incoming</emphasis> cookies. For
3287 <emphasis>outgoing</emphasis> cookies, use
3288 <literal><link linkend="crunch-outgoing-cookies">crunch-outgoing-cookies</link></literal>.
3289 Use <emphasis>both</emphasis> to disable cookies completely.
3292 It makes <emphasis>no sense at all</emphasis> to use this action in conjunction
3293 with the <literal><link linkend="session-cookies-only">session-cookies-only</link></literal> action,
3294 since it would prevent the session cookies from being set. See also
3295 <literal><link linkend="filter-content-cookies">filter-content-cookies</link></literal>.
3301 <term>Example usage:</term>
3304 <screen>+crunch-incoming-cookies</screen>
3312 <!-- ~~~~~ New section ~~~~~ -->
3313 <sect3 renderas="sect4" id="crunch-server-header">
3314 <title>crunch-server-header</title>
3320 <term>Typical use:</term>
3322 <para>Remove a server header <application>Privoxy</application> has no dedicated action for.</para>
3327 <term>Effect:</term>
3330 Deletes every header sent by the server that contains the string the user supplied as parameter.
3337 <!-- Boolean, Parameterized, Multi-value -->
3339 <para>Parameterized.</para>
3344 <term>Parameter:</term>
3356 This action allows you to block server headers for which no dedicated
3357 <application>Privoxy</application> action exists. <application>Privoxy</application>
3358 will remove every server header that contains the string you supplied as parameter.
3361 Regular expressions are <emphasis>not supported</emphasis> and you can't
3362 use this action to block different headers in the same request, unless
3363 they contain the same string.
3366 <literal>crunch-server-header</literal> is only meant for quick tests.
3367 If you have to block several different headers, or only want to modify
3368 parts of them, you should use a custom
3369 <literal><link linkend="server-header-filter">server-header filter</link></literal>.
3373 Don't block any header without understanding the consequences.
3380 <term>Example usage (section):</term>
3383 <screen># Crunch server headers that try to prevent caching
3384 { +crunch-server-header{no-cache} }
3393 <!-- ~~~~~ New section ~~~~~ -->
3394 <sect3 renderas="sect4" id="crunch-outgoing-cookies">
3395 <title>crunch-outgoing-cookies</title>
3399 <term>Typical use:</term>
3402 Prevent the web server from reading any cookies from your system
3408 <term>Effect:</term>
3411 Deletes any <quote>Cookie:</quote> HTTP headers from client requests.
3418 <!-- Boolean, Parameterized, Multi-value -->
3420 <para>Boolean.</para>
3425 <term>Parameter:</term>
3437 This action is only concerned with <emphasis>outgoing</emphasis> cookies. For
3438 <emphasis>incoming</emphasis> cookies, use
3439 <literal><link linkend="crunch-incoming-cookies">crunch-incoming-cookies</link></literal>.
3440 Use <emphasis>both</emphasis> to disable cookies completely.
3443 It makes <emphasis>no sense at all</emphasis> to use this action in conjunction
3444 with the <literal><link linkend="session-cookies-only">session-cookies-only</link></literal> action,
3445 since it would prevent the session cookies from being read.
3451 <term>Example usage:</term>
3454 <screen>+crunch-outgoing-cookies</screen>
3463 <!-- ~~~~~ New section ~~~~~ -->
3464 <sect3 renderas="sect4" id="deanimate-gifs">
3465 <title>deanimate-gifs</title>
3469 <term>Typical use:</term>
3471 <para>Stop those annoying, distracting animated GIF images.</para>
3476 <term>Effect:</term>
3479 De-animate GIF animations, i.e. reduce them to their first or last image.
3486 <!-- boolean, parameterized, Multi-value -->
3488 <para>Parameterized.</para>
3493 <term>Parameter:</term>
3496 <quote>last</quote> or <quote>first</quote>
3505 This will also shrink the images considerably (in bytes, not pixels!). If
3506 the option <quote>first</quote> is given, the first frame of the animation
3507 is used as the replacement. If <quote>last</quote> is given, the last
3508 frame of the animation is used instead, which probably makes more sense for
3509 most banner animations, but also has the risk of not showing the entire
3510 last frame (if it is only a delta to an earlier frame).
3513 You can safely use this action with patterns that will also match non-GIF
3514 objects, because no attempt will be made at anything that doesn't look like
3521 <term>Example usage:</term>
3524 <screen>+deanimate-gifs{last}</screen>
3531 <!-- ~~~~~ New section ~~~~~ -->
3532 <sect3 renderas="sect4" id="downgrade-http-version">
3533 <title>downgrade-http-version</title>
3537 <term>Typical use:</term>
3539 <para>Work around (very rare) problems with HTTP/1.1</para>
3544 <term>Effect:</term>
3547 Downgrades HTTP/1.1 client requests and server replies to HTTP/1.0.
3554 <!-- boolean, parameterized, Multi-value -->
3556 <para>Boolean.</para>
3561 <term>Parameter:</term>
3573 This is a left-over from the time when <application>Privoxy</application>
3574 didn't support important HTTP/1.1 features well. It is left here for the
3575 unlikely case that you experience HTTP/1.1 related problems with some server
3576 out there. Not all (optional) HTTP/1.1 features are supported yet, so there
3577 is a chance you might need this action.
3583 <term>Example usage (section):</term>
3586 <screen>{+downgrade-http-version}
3587 problem-host.example.com</screen>
3595 <!-- ~~~~~ New section ~~~~~ -->
3596 <sect3 renderas="sect4" id="fast-redirects">
3597 <title>fast-redirects</title>
3601 <term>Typical use:</term>
3603 <para>Fool some click-tracking scripts and speed up indirect links.</para>
3608 <term>Effect:</term>
3611 Detects redirection URLs and redirects the browser without contacting
3612 the redirection server first.
3619 <!-- boolean, parameterized, Multi-value -->
3621 <para>Parameterized.</para>
3626 <term>Parameter:</term>
3631 <quote>simple-check</quote> to just search for the string <quote>http://</quote>
3632 to detect redirection URLs.
3637 <quote>check-decoded-url</quote> to decode URLs (if necessary) before searching
3638 for redirection URLs.
3649 Many sites, like yahoo.com, don't just link to other sites. Instead, they
3650 will link to some script on their own servers, giving the destination as a
3651 parameter, which will then redirect you to the final target. URLs
3652 resulting from this scheme typically look like:
3653 <quote>http://www.example.org/click-tracker.cgi?target=http%3a//www.example.net/</quote>.
3656 Sometimes, there are even multiple consecutive redirects encoded in the
3657 URL. These redirections via scripts make your web browsing more traceable,
3658 since the server from which you follow such a link can see where you go
3659 to. Apart from that, valuable bandwidth and time is wasted, while your
3660 browser asks the server for one redirect after the other. Plus, it feeds
3664 This feature is currently not very smart and is scheduled for improvement.
3665 If it is enabled by default, you will have to create some exceptions to
3666 this action. It can lead to failures in several ways:
3669 Not every URLs with other URLs as parameters is evil.
3670 Some sites offer a real service that requires this information to work.
3671 For example a validation service needs to know, which document to validate.
3672 <literal>fast-redirects</literal> assumes that every URL parameter that
3673 looks like another URL is a redirection target, and will always redirect to
3674 the last one. Most of the time the assumption is correct, but if it isn't,
3675 the user gets redirected anyway.
3678 Another failure occurs if the URL contains other parameters after the URL parameter.
3680 <quote>http://www.example.org/?redirect=http%3a//www.example.net/&foo=bar</quote>.
3681 contains the redirection URL <quote>http://www.example.net/</quote>,
3682 followed by another parameter. <literal>fast-redirects</literal> doesn't know that
3683 and will cause a redirect to <quote>http://www.example.net/&foo=bar</quote>.
3684 Depending on the target server configuration, the parameter will be silently ignored
3685 or lead to a <quote>page not found</quote> error. You can prevent this problem by
3686 first using the <literal><link linkend="redirect">redirect</link></literal> action
3687 to remove the last part of the URL, but it requires a little effort.
3690 To detect a redirection URL, <literal>fast-redirects</literal> only
3691 looks for the string <quote>http://</quote>, either in plain text
3692 (invalid but often used) or encoded as <quote>http%3a//</quote>.
3693 Some sites use their own URL encoding scheme, encrypt the address
3694 of the target server or replace it with a database id. In theses cases
3695 <literal>fast-redirects</literal> is fooled and the request reaches the
3696 redirection server where it probably gets logged.
3702 <term>Example usage:</term>
3706 { +fast-redirects{simple-check} }
3709 { +fast-redirects{check-decoded-url} }
3710 another.example.com/testing</screen>
3719 <!-- ~~~~~ New section ~~~~~ -->
3720 <sect3 renderas="sect4" id="filter">
3721 <title>filter</title>
3725 <term>Typical use:</term>
3727 <para>Get rid of HTML and JavaScript annoyances, banner advertisements (by size),
3728 do fun text replacements, add personalized effects, etc.</para>
3733 <term>Effect:</term>
3736 All instances of text-based type, most notably HTML and JavaScript, to which
3737 this action applies, can be filtered on-the-fly through the specified regular
3738 expression based substitutions. (Note: as of version 3.0.3 plain text documents
3739 are exempted from filtering, because web servers often use the
3740 <literal>text/plain</literal> MIME type for all files whose type they don't know.)
3747 <!-- boolean, parameterized, Multi-value -->
3749 <para>Parameterized.</para>
3754 <term>Parameter:</term>
3757 The name of a content filter, as defined in the <link linkend="filter-file">filter file</link>.
3758 Filters can be defined in one or more files as defined by the
3759 <literal><link linkend="filterfile">filterfile</link></literal>
3760 option in the <link linkend="config">config file</link>.
3761 <filename>default.filter</filename> is the collection of filters
3762 supplied by the developers. Locally defined filters should go
3763 in their own file, such as <filename>user.filter</filename>.
3766 When used in its negative form,
3767 and without parameters, <emphasis>all</emphasis> filtering is completely disabled.
3776 For your convenience, there are a number of pre-defined filters available
3777 in the distribution filter file that you can use. See the examples below for
3781 Filtering requires buffering the page content, which may appear to
3782 slow down page rendering since nothing is displayed until all content has
3783 passed the filters. (It does not really take longer, but seems that way
3784 since the page is not incrementally displayed.) This effect will be more
3785 noticeable on slower connections.
3788 <quote>Rolling your own</quote>
3789 filters requires a knowledge of
3790 <ulink url="http://en.wikipedia.org/wiki/Regular_expressions"><quote>Regular
3791 Expressions</quote></ulink> and
3792 <ulink url="http://en.wikipedia.org/wiki/Html"><quote>HTML</quote></ulink>.
3793 This is very powerful feature, and potentially very intrusive.
3794 Filters should be used with caution, and where an equivalent
3795 <quote>action</quote> is not available.
3798 The amount of data that can be filtered is limited to the
3799 <literal><link linkend="buffer-limit">buffer-limit</link></literal>
3800 option in the main <link linkend="config">config file</link>. The
3801 default is 4096 KB (4 Megs). Once this limit is exceeded, the buffered
3802 data, and all pending data, is passed through unfiltered.
3805 Inappropriate MIME types, such as zipped files, are not filtered at all.
3806 (Again, only text-based types except plain text). Encrypted SSL data
3807 (from HTTPS servers) cannot be filtered either, since this would violate
3808 the integrity of the secure transaction. In some situations it might
3809 be necessary to protect certain text, like source code, from filtering
3810 by defining appropriate <literal>-filter</literal> exceptions.
3813 Compressed content can't be filtered either, unless &my-app;
3814 is compiled with zlib support (requires at least &my-app; 3.0.7),
3815 in which case &my-app; will decompress the content before filtering
3819 If you use a &my-app; version without zlib support, but want filtering to work on
3820 as much documents as possible, even those that would normally be sent compressed,
3821 you must use the <literal><link linkend="prevent-compression">prevent-compression</link></literal>
3822 action in conjunction with <literal>filter</literal>.
3825 Content filtering can achieve some of the same effects as the
3826 <literal><link linkend="block">block</link></literal>
3827 action, i.e. it can be used to block ads and banners. But the mechanism
3828 works quite differently. One effective use, is to block ad banners
3829 based on their size (see below), since many of these seem to be somewhat
3833 <link linkend="contact">Feedback</link> with suggestions for new or
3834 improved filters is particularly welcome!
3837 The below list has only the names and a one-line description of each
3838 predefined filter. There are <link linkend="predefined-filters">more
3839 verbose explanations</link> of what these filters do in the <link
3840 linkend="filter-file">filter file chapter</link>.
3846 <term>Example usage (with filters from the distribution <filename>default.filter</filename> file).
3847 See <link linkend="PREDEFINED-FILTERS">the Predefined Filters section</link> for
3848 more explanation on each:</term>
3851 <anchor id="filter-js-annoyances">
3852 <screen>+filter{js-annoyances} # Get rid of particularly annoying JavaScript abuse</screen>
3855 <anchor id="filter-js-events">
3856 <screen>+filter{js-events} # Kill all JS event bindings (Radically destructive! Only for extra nasty sites)</screen>
3859 <anchor id="filter-html-annoyances">
3860 <screen>+filter{html-annoyances} # Get rid of particularly annoying HTML abuse</screen>
3863 <anchor id="filter-content-cookies">
3864 <screen>+filter{content-cookies} # Kill cookies that come in the HTML or JS content</screen>
3867 <anchor id="filter-refresh-tags">
3868 <screen>+filter{refresh-tags} # Kill automatic refresh tags (for dial-on-demand setups)</screen>
3871 <anchor id="filter-unsolicited-popups">
3872 <screen>+filter{unsolicited-popups} # Disable only unsolicited pop-up windows. Useful if your browser lacks this ability.</screen>
3875 <anchor id="filter-all-popups">
3876 <screen>+filter{all-popups} # Kill all popups in JavaScript and HTML. Useful if your browser lacks this ability.</screen>
3879 <anchor id="filter-img-reorder">
3880 <screen>+filter{img-reorder} # Reorder attributes in <img> tags to make the banners-by-* filters more effective</screen>
3883 <anchor id="filter-banners-by-size">
3884 <screen>+filter{banners-by-size} # Kill banners by size</screen>
3887 <anchor id="filter-banners-by-link">
3888 <screen>+filter{banners-by-link} # Kill banners by their links to known clicktrackers</screen>
3891 <anchor id="filter-webbugs">
3892 <screen>+filter{webbugs} # Squish WebBugs (1x1 invisible GIFs used for user tracking)</screen>
3895 <anchor id="filter-tiny-textforms">
3896 <screen>+filter{tiny-textforms} # Extend those tiny textareas up to 40x80 and kill the hard wrap</screen>
3899 <anchor id="filter-jumping-windows">
3900 <screen>+filter{jumping-windows} # Prevent windows from resizing and moving themselves</screen>
3903 <anchor id="filter-frameset-borders">
3904 <screen>+filter{frameset-borders} # Give frames a border and make them resizeable</screen>
3907 <anchor id="filter-demoronizer">
3908 <screen>+filter{demoronizer} # Fix MS's non-standard use of standard charsets</screen>
3911 <anchor id="filter-shockwave-flash">
3912 <screen>+filter{shockwave-flash} # Kill embedded Shockwave Flash objects</screen>
3915 <anchor id="filter-quicktime-kioskmode">
3916 <screen>+filter{quicktime-kioskmode} # Make Quicktime movies savable</screen>
3919 <anchor id="filter-fun">
3920 <screen>+filter{fun} # Text replacements for subversive browsing fun!</screen>
3923 <anchor id="filter-crude-parental">
3924 <screen>+filter{crude-parental} # Crude parental filtering (demo only)</screen>
3927 <anchor id="filter-ie-exploits">
3928 <screen>+filter{ie-exploits} # Disable some known Internet Explorer bug exploits</screen>
3931 <anchor id="filter-site-specifics">
3932 <screen>+filter{site-specifics} # Custom filters for specific site related problems</screen>
3935 <anchor id="filter-google">
3936 <screen>+filter{google} # Removes text ads and other Google specific improvements</screen>
3939 <anchor id="filter-yahoo">
3940 <screen>+filter{yahoo} # Removes text ads and other Yahoo specific improvements</screen>
3943 <anchor id="filter-msn">
3944 <screen>+filter{msn} # Removes text ads and other MSN specific improvements</screen>
3947 <anchor id="filter-blogspot">
3948 <screen>+filter{blogspot} # Cleans up Blogspot blogs</screen>
3951 <anchor id="filter-no-ping">
3952 <screen>+filter{no-ping} # Removes non-standard ping attributes from anchor and area tags</screen>
3960 <!-- ~~~~~ New section ~~~~~ -->
3961 <sect3 renderas="sect4" id="force-text-mode">
3962 <title>force-text-mode</title>
3968 <term>Typical use:</term>
3970 <para>Force <application>Privoxy</application> to treat a document as if it was in some kind of <emphasis>text</emphasis> format. </para>
3975 <term>Effect:</term>
3978 Declares a document as text, even if the <quote>Content-Type:</quote> isn't detected as such.
3985 <!-- Boolean, Parameterized, Multi-value -->
3987 <para>Boolean.</para>
3992 <term>Parameter:</term>
4004 As explained <literal><link linkend="filter">above</link></literal>,
4005 <application>Privoxy</application> tries to only filter files that are
4006 in some kind of text format. The same restrictions apply to
4007 <literal><link linkend="content-type-overwrite">content-type-overwrite</link></literal>.
4008 <literal>force-text-mode</literal> declares a document as text,
4009 without looking at the <quote>Content-Type:</quote> first.
4013 Think twice before activating this action. Filtering binary data
4014 with regular expressions can cause file damage.
4021 <term>Example usage:</term>
4034 <!-- ~~~~~ New section ~~~~~ -->
4035 <sect3 renderas="sect4" id="forward-override">
4036 <title>forward-override</title>
4042 <term>Typical use:</term>
4044 <para>Change the forwarding settings based on User-Agent or request origin</para>
4049 <term>Effect:</term>
4052 Overrules the forward directives in the configuration files.
4059 <!-- Boolean, Parameterized, Multi-value -->
4061 <para>Multi-value.</para>
4066 <term>Parameter:</term>
4070 <para><quote>forward .</quote> to use a direct connection without any additional proxies.</para>
4074 <quote>forward 127.0.0.1:8123</quote> to use the HTTP proxy listening at 127.0.0.1 port 8123.
4079 <quote>forward-socks4a 127.0.0.1:9050 .</quote> to use the socks4a proxy listening at 127.0.0.1 port 9050.
4080 Replace <quote>forward-socks4a</quote> with <quote>forward-socks4</quote> to use a socks4 connection (with local DNS
4081 resolution) instead.
4086 <quote>forward-socks4a 127.0.0.1:9050 proxy.example.org:8000</quote> to use the socks4a proxy
4087 listening at 127.0.0.1 port 9050 to reach the HTTP proxy listening at proxy.example.org port 8000.
4088 Replace <quote>forward-socks4a</quote> with <quote>forward-socks4</quote> to use a socks4 connection (with local DNS
4089 resolution) instead.
4100 This action takes parameters similar to the <!-- I hope this link actual works -->
4101 <link linkend="forwarding">forward</link> directives in the configuration
4102 file, but without the URL pattern. It can be used as replacement, but normally it's only
4103 used in cases where matching based on the request URL isn't sufficient.
4107 Please read the description for the <link linkend="forwarding">forward</link> directives before
4108 using this action. Forwarding to the wrong people will reduce your privacy and increase the
4109 chances of man-in-the-middle attacks.
4112 If the ports are missing or invalid, default values will be used. This might change
4113 in the future and you shouldn't rely on it. Otherwise incorrect syntax causes Privoxy
4117 Use the <ulink url="http://config.privoxy.org/show-url-info">show-url-info CGI page</ulink>
4118 to verify that your forward settings do what you thought the do.
4125 <term>Example usage:</term>
4129 # Always use direct connections for requests previously tagged as
4130 # <quote>User-Agent: fetch libfetch/2.0</quote> and make sure
4131 # resuming downloads continues to work.
4132 # This way you can continue to use Tor for your normal browsing,
4133 # without overloading the Tor network with your FreeBSD ports updates
4134 # or downloads of bigger files like ISOs.
4135 {+forward-override{forward .} \
4136 -hide-if-modified-since \
4137 -overwrite-last-modified \
4139 TAG:^User-Agent: fetch libfetch/2.0$
4148 <!-- ~~~~~ New section ~~~~~ -->
4149 <sect3 renderas="sect4" id="handle-as-empty-document">
4150 <title>handle-as-empty-document</title>
4156 <term>Typical use:</term>
4158 <para>Mark URLs that should be replaced by empty documents <emphasis>if they get blocked</emphasis></para>
4163 <term>Effect:</term>
4166 This action alone doesn't do anything noticeable. It just marks URLs.
4167 If the <literal><link linkend="block">block</link></literal> action <emphasis>also applies</emphasis>,
4168 the presence or absence of this mark decides whether an HTML <quote>BLOCKED</quote>
4169 page, or an empty document will be sent to the client as a substitute for the blocked content.
4170 The <emphasis>empty</emphasis> document isn't literally empty, but actually contains a single space.
4177 <!-- Boolean, Parameterized, Multi-value -->
4179 <para>Boolean.</para>
4184 <term>Parameter:</term>
4196 Some browsers complain about syntax errors if JavaScript documents
4197 are blocked with <application>Privoxy's</application>
4198 default HTML page; this option can be used to silence them.
4199 And of course this action can also be used to eliminate the &my-app;
4200 BLOCKED message in frames.
4203 The content type for the empty document can be specified with
4204 <literal><link linkend="content-type-overwrite">content-type-overwrite{}</link></literal>,
4205 but usually this isn't necessary.
4211 <term>Example usage:</term>
4214 <screen># Block all documents on example.org that end with ".js",
4215 # but send an empty document instead of the usual HTML message.
4216 {+block +handle-as-empty-document}
4226 <!-- ~~~~~ New section ~~~~~ -->
4227 <sect3 renderas="sect4" id="handle-as-image">
4228 <title>handle-as-image</title>
4232 <term>Typical use:</term>
4234 <para>Mark URLs as belonging to images (so they'll be replaced by images <emphasis>if they do get blocked</emphasis>, rather than HTML pages)</para>
4239 <term>Effect:</term>
4242 This action alone doesn't do anything noticeable. It just marks URLs as images.
4243 If the <literal><link linkend="block">block</link></literal> action <emphasis>also applies</emphasis>,
4244 the presence or absence of this mark decides whether an HTML <quote>blocked</quote>
4245 page, or a replacement image (as determined by the <literal><link
4246 linkend="set-image-blocker">set-image-blocker</link></literal> action) will be sent to the
4247 client as a substitute for the blocked content.
4254 <!-- Boolean, Parameterized, Multi-value -->
4256 <para>Boolean.</para>
4261 <term>Parameter:</term>
4273 The below generic example section is actually part of <filename>default.action</filename>.
4274 It marks all URLs with well-known image file name extensions as images and should
4278 Users will probably only want to use the handle-as-image action in conjunction with
4279 <literal><link linkend="block">block</link></literal>, to block sources of banners, whose URLs don't
4280 reflect the file type, like in the second example section.
4283 Note that you cannot treat HTML pages as images in most cases. For instance, (in-line) ad
4284 frames require an HTML page to be sent, or they won't display properly.
4285 Forcing <literal>handle-as-image</literal> in this situation will not replace the
4286 ad frame with an image, but lead to error messages.
4292 <term>Example usage (sections):</term>
4295 <screen># Generic image extensions:
4298 /.*\.(gif|jpg|jpeg|png|bmp|ico)$
4300 # These don't look like images, but they're banners and should be
4301 # blocked as images:
4303 {+block +handle-as-image}
4304 some.nasty-banner-server.com/junk.cgi?output=trash
4306 # Banner source! Who cares if they also have non-image content?
4316 <!-- ~~~~~ New section ~~~~~ -->
4317 <sect3 renderas="sect4" id="hide-accept-language">
4318 <title>hide-accept-language</title>
4324 <term>Typical use:</term>
4326 <para>Pretend to use different language settings.</para>
4331 <term>Effect:</term>
4334 Deletes or replaces the <quote>Accept-Language:</quote> HTTP header in client requests.
4341 <!-- Boolean, Parameterized, Multi-value -->
4343 <para>Parameterized.</para>
4348 <term>Parameter:</term>
4351 Keyword: <quote>block</quote>, or any user defined value.
4360 Faking the browser's language settings can be useful to make a
4361 foreign User-Agent set with
4362 <literal><link linkend="hide-user-agent">hide-user-agent</link></literal>
4366 However some sites with content in different languages check the
4367 <quote>Accept-Language:</quote> to decide which one to take by default.
4368 Sometimes it isn't possible to later switch to another language without
4369 changing the <quote>Accept-Language:</quote> header first.
4372 Therefore it's a good idea to either only change the
4373 <quote>Accept-Language:</quote> header to languages you understand,
4374 or to languages that aren't wide spread.
4377 Before setting the <quote>Accept-Language:</quote> header
4378 to a rare language, you should consider that it helps to
4379 make your requests unique and thus easier to trace.
4380 If you don't plan to change this header frequently,
4381 you should stick to a common language.
4387 <term>Example usage (section):</term>
4390 <screen># Pretend to use Canadian language settings.
4391 {+hide-accept-language{en-ca} \
4392 +hide-user-agent{Mozilla/5.0 (X11; U; OpenBSD i386; en-CA; rv:1.8.0.4) Gecko/20060628 Firefox/1.5.0.4} \
4402 <!-- ~~~~~ New section ~~~~~ -->
4403 <sect3 renderas="sect4" id="hide-content-disposition">
4404 <title>hide-content-disposition</title>
4410 <term>Typical use:</term>
4412 <para>Prevent download menus for content you prefer to view inside the browser.</para>
4417 <term>Effect:</term>
4420 Deletes or replaces the <quote>Content-Disposition:</quote> HTTP header set by some servers.
4427 <!-- Boolean, Parameterized, Multi-value -->
4429 <para>Parameterized.</para>
4434 <term>Parameter:</term>
4437 Keyword: <quote>block</quote>, or any user defined value.
4446 Some servers set the <quote>Content-Disposition:</quote> HTTP header for
4447 documents they assume you want to save locally before viewing them.
4448 The <quote>Content-Disposition:</quote> header contains the file name
4449 the browser is supposed to use by default.
4452 In most browsers that understand this header, it makes it impossible to
4453 <emphasis>just view</emphasis> the document, without downloading it first,
4454 even if it's just a simple text file or an image.
4457 Removing the <quote>Content-Disposition:</quote> header helps
4458 to prevent this annoyance, but some browsers additionally check the
4459 <quote>Content-Type:</quote> header, before they decide if they can
4460 display a document without saving it first. In these cases, you have
4461 to change this header as well, before the browser stops displaying
4465 It is also possible to change the server's file name suggestion
4466 to another one, but in most cases it isn't worth the time to set
4473 <term>Example usage:</term>
4476 <screen># Disarm the download link in Sourceforge's patch tracker
4478 +content-type-overwrite{text/plain}\
4479 +hide-content-disposition{block} }
4480 .sourceforge.net/tracker/download\.php</screen>
4488 <!-- ~~~~~ New section ~~~~~ -->
4489 <sect3 renderas="sect4" id="hide-if-modified-since">
4490 <title>hide-if-modified-since</title>
4496 <term>Typical use:</term>
4498 <para>Prevent yet another way to track the user's steps between sessions.</para>
4503 <term>Effect:</term>
4506 Deletes the <quote>If-Modified-Since:</quote> HTTP client header or modifies its value.
4513 <!-- Boolean, Parameterized, Multi-value -->
4515 <para>Parameterized.</para>
4520 <term>Parameter:</term>
4523 Keyword: <quote>block</quote>, or a user defined value that specifies a range of hours.
4532 Removing this header is useful for filter testing, where you want to force a real
4533 reload instead of getting status code <quote>304</quote>, which would cause the
4534 browser to use a cached copy of the page.
4537 Instead of removing the header, <literal>hide-if-modified-since</literal> can
4538 also add or subtract a random amount of time to/from the header's value.
4539 You specify a range of minutes where the random factor should be chosen from and
4540 <application>Privoxy</application> does the rest. A negative value means
4541 subtracting, a positive value adding.
4544 Randomizing the value of the <quote>If-Modified-Since:</quote> makes
4545 sure it isn't used as a cookie replacement, but you will run into
4546 caching problems if the random range is too high.
4549 It is a good idea to only use a small negative value and let
4550 <literal><link linkend="overwrite-last-modified">overwrite-last-modified</link></literal>
4551 handle the greater changes.
4554 It is also recommended to use this action together with
4555 <literal><link linkend="crunch-if-none-match">crunch-if-none-match</link></literal>.
4561 <term>Example usage (section):</term>
4564 <screen># Let the browser revalidate without being tracked across sessions
4565 { +hide-if-modified-since{-60} \
4566 +overwrite-last-modified{randomize} \
4567 +crunch-if-none-match}
4576 <!-- ~~~~~ New section ~~~~~ -->
4577 <sect3 renderas="sect4" id="hide-forwarded-for-headers">
4578 <title>hide-forwarded-for-headers</title>
4584 <term>Typical use:</term>
4586 <para>Improve privacy by hiding the true source of the request</para>
4591 <term>Effect:</term>
4594 Deletes any existing <quote>X-Forwarded-for:</quote> HTTP header from client requests,
4595 and prevents adding a new one.
4602 <!-- Boolean, Parameterized, Multi-value -->
4604 <para>Boolean.</para>
4609 <term>Parameter:</term>
4621 It is fairly safe to leave this on.
4624 This action is scheduled for improvement: It should be able to generate forged
4625 <quote>X-Forwarded-for:</quote> headers using random IP addresses from a specified network,
4626 to make successive requests from the same client look like requests from a pool of different
4627 users sharing the same proxy.
4633 <term>Example usage:</term>
4636 <screen>+hide-forwarded-for-headers</screen>
4644 <!-- ~~~~~ New section ~~~~~ -->
4645 <sect3 renderas="sect4" id="hide-from-header">
4646 <title>hide-from-header</title>
4650 <term>Typical use:</term>
4652 <para>Keep your (old and ill) browser from telling web servers your email address</para>
4657 <term>Effect:</term>
4660 Deletes any existing <quote>From:</quote> HTTP header, or replaces it with the
4668 <!-- Boolean, Parameterized, Multi-value -->
4670 <para>Parameterized.</para>
4675 <term>Parameter:</term>
4678 Keyword: <quote>block</quote>, or any user defined value.
4687 The keyword <quote>block</quote> will completely remove the header
4688 (not to be confused with the <literal><link linkend="block">block</link></literal>
4692 Alternately, you can specify any value you prefer to be sent to the web
4693 server. If you do, it is a matter of fairness not to use any address that
4694 is actually used by a real person.
4697 This action is rarely needed, as modern web browsers don't send
4698 <quote>From:</quote> headers anymore.
4704 <term>Example usage:</term>
4707 <screen>+hide-from-header{block}</screen> or
4708 <screen>+hide-from-header{spam-me-senseless@sittingduck.example.com}</screen>
4716 <!-- ~~~~~ New section ~~~~~ -->
4717 <sect3 renderas="sect4" id="hide-referrer">
4718 <title>hide-referrer</title>
4719 <anchor id="hide-referer">
4722 <term>Typical use:</term>
4724 <para>Conceal which link you followed to get to a particular site</para>
4729 <term>Effect:</term>
4732 Deletes the <quote>Referer:</quote> (sic) HTTP header from the client request,
4733 or replaces it with a forged one.
4740 <!-- Boolean, Parameterized, Multi-value -->
4742 <para>Parameterized.</para>
4747 <term>Parameter:</term>
4751 <para><quote>conditional-block</quote> to delete the header completely if the host has changed.</para>
4754 <para><quote>block</quote> to delete the header unconditionally.</para>
4757 <para><quote>forge</quote> to pretend to be coming from the homepage of the server we are talking to.</para>
4760 <para>Any other string to set a user defined referrer.</para>
4770 <literal>conditional-block</literal> is the only parameter,
4771 that isn't easily detected in the server's log file. If it blocks the
4772 referrer, the request will look like the visitor used a bookmark or
4773 typed in the address directly.
4776 Leaving the referrer unmodified for requests on the same host
4777 allows the server owner to see the visitor's <quote>click path</quote>,
4778 but in most cases she could also get that information by comparing
4779 other parts of the log file: for example the User-Agent if it isn't
4780 a very common one, or the user's IP address if it doesn't change between
4784 Always blocking the referrer, or using a custom one, can lead to
4785 failures on servers that check the referrer before they answer any
4786 requests, in an attempt to prevent their valuable content from being
4787 embedded or linked to elsewhere.
4790 Both <literal>conditional-block</literal> and <literal>forge</literal>
4791 will work with referrer checks, as long as content and valid referring page
4792 are on the same host. Most of the time that's the case.
4795 <literal>hide-referer</literal> is an alternate spelling of
4796 <literal>hide-referrer</literal> and the two can be can be freely
4797 substituted with each other. (<quote>referrer</quote> is the
4798 correct English spelling, however the HTTP specification has a bug - it
4799 requires it to be spelled as <quote>referer</quote>.)
4805 <term>Example usage:</term>
4808 <screen>+hide-referrer{forge}</screen> or
4809 <screen>+hide-referrer{http://www.yahoo.com/}</screen>
4817 <!-- ~~~~~ New section ~~~~~ -->
4818 <sect3 renderas="sect4" id="hide-user-agent">
4819 <title>hide-user-agent</title>
4823 <term>Typical use:</term>
4825 <para>Conceal your type of browser and client operating system</para>
4830 <term>Effect:</term>
4833 Replaces the value of the <quote>User-Agent:</quote> HTTP header
4834 in client requests with the specified value.
4841 <!-- Boolean, Parameterized, Multi-value -->
4843 <para>Parameterized.</para>
4848 <term>Parameter:</term>
4851 Any user-defined string.
4861 This can lead to problems on web sites that depend on looking at this header in
4862 order to customize their content for different browsers (which, by the
4863 way, is <emphasis>NOT</emphasis> the right thing to do: good web sites
4864 work browser-independently).
4866 <ulink url="http://www.javascriptkit.com/javaindex.shtml">smart way to do
4872 Using this action in multi-user setups or wherever different types of
4873 browsers will access the same <application>Privoxy</application> is
4874 <emphasis>not recommended</emphasis>. In single-user, single-browser
4875 setups, you might use it to delete your OS version information from
4876 the headers, because it is an invitation to exploit known bugs for your
4877 OS. It is also occasionally useful to forge this in order to access
4878 sites that won't let you in otherwise (though there may be a good
4879 reason in some cases). Example of this: some MSN sites will not
4880 let <application>Mozilla</application> enter, yet forging to a
4881 <application>Netscape 6.1</application> user-agent works just fine.
4882 (Must be just a silly MS goof, I'm sure :-).
4885 This action is scheduled for improvement.
4891 <term>Example usage:</term>
4894 <screen>+hide-user-agent{Netscape 6.1 (X11; I; Linux 2.4.18 i686)}</screen>
4902 <!-- ~~~~~ New section ~~~~~ -->
4903 <sect3 renderas="sect4" id="inspect-jpegs">
4904 <title>inspect-jpegs</title>
4910 <term>Typical use:</term>
4912 <para>To protect against the MS buffer over-run in JPEG processing</para>
4917 <term>Effect:</term>
4920 Protect against a known exploit
4927 <!-- Boolean, Parameterized, Multi-value -->
4929 <para>Boolean.</para>
4934 <term>Parameter:</term>
4946 See Microsoft Security Bulletin MS04-028. JPEG images are one of the most
4947 common image types found across the Internet. The exploit as described can
4948 allow execution of code on the target system, giving an attacker access
4949 to the system in question by merely planting an altered JPEG image, which
4950 would have no obvious indications of what lurks inside. This action
4951 prevents unwanted intrusion.
4958 <term>Example usage:</term>
4960 <para><screen>+inspect-jpegs</screen></para>
4969 <!-- ~~~~~ New section ~~~~~ -->
4970 <sect3 renderas="sect4" id="kill-popups">
4971 <title>kill-popups<anchor id="kill-popup"></title>
4975 <term>Typical use:</term>
4977 <para>Eliminate those annoying pop-up windows (deprecated)</para>
4982 <term>Effect:</term>
4985 While loading the document, replace JavaScript code that opens
4986 pop-up windows with (syntactically neutral) dummy code on the fly.
4993 <!-- Boolean, Parameterized, Multi-value -->
4995 <para>Boolean.</para>
5000 <term>Parameter:</term>
5012 This action is basically a built-in, hardwired special-purpose filter
5013 action, but there are important differences: For <literal>kill-popups</literal>,
5014 the document need not be buffered, so it can be incrementally rendered while
5015 downloading. But <literal>kill-popups</literal> doesn't catch as many pop-ups as
5017 linkend="FILTER-ALL-POPUPS">filter{<replaceable>all-popups</replaceable>}</link></literal>
5018 does and is not as smart as <literal><link
5019 linkend="FILTER-UNSOLICITED-POPUPS">filter{<replaceable>unsolicited-popups</replaceable>}</link>
5023 Think of it as a fast and efficient replacement for a filter that you
5024 can use if you don't want any filtering at all. Note that it doesn't make
5025 sense to combine it with any <literal><link linkend="filter">filter</link></literal> action,
5026 since as soon as one <literal><link linkend="filter">filter</link></literal> applies,
5027 the whole document needs to be buffered anyway, which destroys the advantage of
5028 the <literal>kill-popups</literal> action over its filter equivalent.
5031 Killing all pop-ups unconditionally is problematic. Many shops and banks rely on
5032 pop-ups to display forms, shopping carts etc, and the <literal><link
5033 linkend="FILTER-UNSOLICITED-POPUPS">filter{<replaceable>unsolicited-popups</replaceable>}</link>
5034 </literal> does a better job of catching only the unwanted ones.
5037 If the only kind of pop-ups that you want to kill are exit consoles (those
5038 <emphasis>really nasty</emphasis> windows that appear when you close an other
5039 one), you might want to use
5041 linkend="filter">filter</link>{<replaceable>js-annoyances</replaceable>}</literal>
5045 This action is most appropriate for browsers that don't have any controls
5046 for unwanted pop-ups. Not recommended for general usage.
5051 An alternate spelling is <literal>+kill-popup</literal>, which is
5059 <term>Example usage:</term>
5061 <para><screen>+kill-popups</screen></para>
5068 <!-- ~~~~~ New section ~~~~~ -->
5069 <sect3 renderas="sect4" id="limit-connect">
5070 <title>limit-connect</title>
5074 <term>Typical use:</term>
5076 <para>Prevent abuse of <application>Privoxy</application> as a TCP proxy relay or disable SSL for untrusted sites</para>
5081 <term>Effect:</term>
5084 Specifies to which ports HTTP CONNECT requests are allowable.
5091 <!-- Boolean, Parameterized, Multi-value -->
5093 <para>Parameterized.</para>
5098 <term>Parameter:</term>
5101 A comma-separated list of ports or port ranges (the latter using dashes, with the minimum
5102 defaulting to 0 and the maximum to 65K).
5111 By default, i.e. if no <literal>limit-connect</literal> action applies,
5112 <application>Privoxy</application> only allows HTTP CONNECT
5113 requests to port 443 (the standard, secure HTTPS port). Use
5114 <literal>limit-connect</literal> if more fine-grained control is desired
5115 for some or all destinations.
5118 The CONNECT methods exists in HTTP to allow access to secure websites
5119 (<quote>https://</quote> URLs) through proxies. It works very simply:
5120 the proxy connects to the server on the specified port, and then
5121 short-circuits its connections to the client and to the remote server.
5122 This can be a big security hole, since CONNECT-enabled proxies can be
5123 abused as TCP relays very easily.
5126 <application>Privoxy</application> relays HTTPS traffic without seeing
5127 the decoded content. Websites can leverage this limitation to circumvent &my-app;'s
5128 filters. By specifying an invalid port range you can disable HTTPS entirely.
5129 If you plan to disable SSL by default, consider enabling
5130 <literal><link linkend="treat-forbidden-connects-like-blocks ">treat-forbidden-connects-like-blocks</link></literal>
5131 as well, to be able to quickly create exceptions.
5137 <term>Example usages:</term>
5139 <!-- I had trouble getting the spacing to look right in my browser -->
5140 <!-- I probably have the wrong font setup, bollocks. -->
5141 <!-- Apparently the emphasis tag uses a proportional font no matter what -->
5143 <screen>+limit-connect{443} # This is the default and need not be specified.
5144 +limit-connect{80,443} # Ports 80 and 443 are OK.
5145 +limit-connect{-3, 7, 20-100, 500-} # Ports less than 3, 7, 20 to 100 and above 500 are OK.
5146 +limit-connect{-} # All ports are OK
5147 +limit-connect{,} # No HTTPS/SSL traffic is allowed</screen>
5154 <!-- ~~~~~ New section ~~~~~ -->
5155 <sect3 renderas="sect4" id="prevent-compression">
5156 <title>prevent-compression</title>
5160 <term>Typical use:</term>
5163 Ensure that servers send the content uncompressed, so it can be
5164 passed through <literal><link linkend="filter">filter</link></literal>s.
5170 <term>Effect:</term>
5173 Removes the Accept-Encoding header which can be used to ask for compressed transfer.
5180 <!-- Boolean, Parameterized, Multi-value -->
5182 <para>Boolean.</para>
5187 <term>Parameter:</term>
5199 More and more websites send their content compressed by default, which
5200 is generally a good idea and saves bandwidth. But the <literal><link
5201 linkend="filter">filter</link></literal>, <literal><link linkend="deanimate-gifs">deanimate-gifs</link></literal>
5202 and <literal><link linkend="kill-popups">kill-popups</link></literal> actions need
5203 access to the uncompressed data.
5206 When compiled with zlib support (available since &my-app; 3.0.7), content that should be
5207 filtered is decompressed on-the-fly and you don't have to worry about this action.
5208 If you are using an older &my-app; version, or one that hasn't been compiled with zlib
5209 support, this action can be used to convince the server to send the content uncompressed.
5212 Most text-based instances compress very well, the size is seldom decreased by less than 50%,
5213 for markup-heavy instances like news feeds saving more than 90% of the original size isn't
5217 Not using compression will therefore slow down the transfer, and you should only
5218 enable this action if you really need it. As of &my-app; 3.0.7 it's disabled in all
5219 predefined action settings.
5222 Note that some (rare) ill-configured sites don't handle requests for uncompressed
5223 documents correctly. Broken PHP applications tend to send an empty document body,
5224 some IIS versions only send the beginning of the content. If you enable
5225 <literal>prevent-compression</literal> per default, you might want to add
5226 exceptions for those sites. See the example for how to do that.
5232 <term>Example usage (sections):</term>
5236 # Selectively turn off compression, and enable a filter
5238 { +filter{tiny-textforms} +prevent-compression }
5239 # Match only these sites
5244 # Or instead, we could set a universal default:
5246 { +prevent-compression }
5249 # Then maybe make exceptions for broken sites:
5251 { -prevent-compression }
5252 .compusa.com/</screen>
5261 <!-- ~~~~~ New section ~~~~~ -->
5262 <sect3 renderas="sect4" id="overwrite-last-modified">
5263 <title>overwrite-last-modified</title>
5269 <term>Typical use:</term>
5271 <para>Prevent yet another way to track the user's steps between sessions.</para>
5276 <term>Effect:</term>
5279 Deletes the <quote>Last-Modified:</quote> HTTP server header or modifies its value.
5286 <!-- Boolean, Parameterized, Multi-value -->
5288 <para>Parameterized.</para>
5293 <term>Parameter:</term>
5296 One of the keywords: <quote>block</quote>, <quote>reset-to-request-time</quote>
5297 and <quote>randomize</quote>
5306 Removing the <quote>Last-Modified:</quote> header is useful for filter
5307 testing, where you want to force a real reload instead of getting status
5308 code <quote>304</quote>, which would cause the browser to reuse the old
5309 version of the page.
5312 The <quote>randomize</quote> option overwrites the value of the
5313 <quote>Last-Modified:</quote> header with a randomly chosen time
5314 between the original value and the current time. In theory the server
5315 could send each document with a different <quote>Last-Modified:</quote>
5316 header to track visits without using cookies. <quote>Randomize</quote>
5317 makes it impossible and the browser can still revalidate cached documents.
5320 <quote>reset-to-request-time</quote> overwrites the value of the
5321 <quote>Last-Modified:</quote> header with the current time. You could use
5322 this option together with
5323 <literal><link linkend="hide-if-modified-since">hided-if-modified-since</link></literal>
5324 to further customize your random range.
5327 The preferred parameter here is <quote>randomize</quote>. It is safe
5328 to use, as long as the time settings are more or less correct.
5329 If the server sets the <quote>Last-Modified:</quote> header to the time
5330 of the request, the random range becomes zero and the value stays the same.
5331 Therefore you should later randomize it a second time with
5332 <literal><link linkend="hide-if-modified-since">hided-if-modified-since</link></literal>,
5336 It is also recommended to use this action together with
5337 <literal><link linkend="crunch-if-none-match">crunch-if-none-match</link></literal>.
5343 <term>Example usage:</term>
5346 <screen># Let the browser revalidate without being tracked across sessions
5347 { +hide-if-modified-since{-60} \
5348 +overwrite-last-modified{randomize} \
5349 +crunch-if-none-match}
5358 <!-- ~~~~~ New section ~~~~~ -->
5359 <sect3 renderas="sect4" id="redirect">
5360 <title>redirect</title>
5366 <term>Typical use:</term>
5369 Redirect requests to other sites.
5375 <term>Effect:</term>
5378 Convinces the browser that the requested document has been moved
5379 to another location and the browser should get it from there.
5386 <!-- Boolean, Parameterized, Multi-value -->
5388 <para>Parameterized</para>
5393 <term>Parameter:</term>
5396 An absolute URL or a single pcrs command.
5405 Requests to which this action applies are answered with a
5406 HTTP redirect to URLs of your choosing. The new URL is
5407 either provided as parameter, or derived by applying a
5408 single pcrs command to the original URL.
5411 This action will be ignored if you use it together with
5412 <literal><link linkend="block">block</link></literal>.
5413 It can be combined with
5414 <literal><link linkend="fast-redirects">fast-redirects{check-decoded-url}</link></literal>
5415 to redirect to a decoded version of a rewritten URL.
5418 Use this action carefully, make sure not to create redirection loops
5419 and be aware that using your own redirects might make it
5420 possible to fingerprint your requests.
5426 <term>Example usages:</term>
5429 <screen># Replace example.com's style sheet with another one
5430 { +redirect{http://localhost/css-replacements/example.com.css} }
5431 example.com/stylesheet\.css
5433 # Create a short, easy to remember nickname for a favorite site
5434 # (relies on the browser accept and forward invalid URLs to &my-app;)
5435 { +redirect{http://www.privoxy.org/user-manual/actions-file.html} }
5438 # Always use the expanded view for Undeadly.org articles
5439 # (Note the $ at the end of the URL pattern to make sure
5440 # the request for the rewritten URL isn't redirected as well)
5441 {+redirect{s@$@&mode=expanded@}}
5442 undeadly.org/cgi\?action=article&sid=\d*$</screen>
5451 <!-- ~~~~~ New section ~~~~~ -->
5452 <sect3 renderas="sect4" id="send-vanilla-wafer">
5453 <title>send-vanilla-wafer</title>
5457 <term>Typical use:</term>
5460 Feed log analysis scripts with useless data.
5466 <term>Effect:</term>
5469 Sends a cookie with each request stating that you do not accept any copyright
5470 on cookies sent to you, and asking the site operator not to track you.
5477 <!-- Boolean, Parameterized, Multi-value -->
5479 <para>Boolean.</para>
5484 <term>Parameter:</term>
5496 The vanilla wafer is a (relatively) unique header and could conceivably be used to track you.
5499 This action is rarely used and not enabled in the default configuration.
5505 <term>Example usage:</term>
5508 <screen>+send-vanilla-wafer</screen>
5517 <!-- ~~~~~ New section ~~~~~ -->
5518 <sect3 renderas="sect4" id="send-wafer">
5519 <title>send-wafer</title>
5523 <term>Typical use:</term>
5526 Send custom cookies or feed log analysis scripts with even more useless data.
5532 <term>Effect:</term>
5535 Sends a custom, user-defined cookie with each request.
5542 <!-- Boolean, Parameterized, Multi-value -->
5544 <para>Multi-value.</para>
5549 <term>Parameter:</term>
5552 A string of the form <quote><replaceable class="option">name</replaceable>=<replaceable
5553 class="parameter">value</replaceable></quote>.
5562 Being multi-valued, multiple instances of this action can apply to the same request,
5563 resulting in multiple cookies being sent.
5566 This action is rarely used and not enabled in the default configuration.
5571 <term>Example usage (section):</term>
5574 <screen>{+send-wafer{UsingPrivoxy=true}}
5575 my-internal-testing-server.void</screen>
5583 <!-- ~~~~~ New section ~~~~~ -->
5584 <sect3 renderas="sect4" id="server-header-filter">
5585 <title>server-header-filter</title>
5589 <term>Typical use:</term>
5592 Rewrite or remove single server headers.
5598 <term>Effect:</term>
5601 All server headers to which this action applies are filtered on-the-fly
5602 through the specified regular expression based substitutions.
5609 <!-- boolean, parameterized, Multi-value -->
5611 <para>Parameterized.</para>
5616 <term>Parameter:</term>
5619 The name of a server-header filter, as defined in one of the
5620 <link linkend="filter-file">filter files</link>.
5629 Server-header filters are applied to each header on its own, not to
5630 all at once. This makes it easier to diagnose problems, but on the downside
5631 you can't write filters that only change header x if header y's value is z.
5632 You can do that by using tags though.
5635 Server-header filters are executed after the other header actions have finished
5636 and use their output as input.
5639 Please refer to the <link linkend="filter-file">filter file chapter</link>
5640 to learn which server-header filters are available by default, and how to
5646 <term>Example usage (section):</term>
5650 {+server-header-filter{html-to-xml}}
5651 example.org/xml-instance-that-is-delivered-as-html
5653 {+server-header-filter{xml-to-html}}
5654 example.org/instance-that-is-delivered-as-xml-but-is-not
5664 <!-- ~~~~~ New section ~~~~~ -->
5665 <sect3 renderas="sect4" id="server-header-tagger">
5666 <title>server-header-tagger</title>
5670 <term>Typical use:</term>
5673 Disable or disable filters based on the Content-Type header.
5679 <term>Effect:</term>
5682 Server headers to which this action applies are filtered on-the-fly through
5683 the specified regular expression based substitutions, the result is used as
5691 <!-- boolean, parameterized, Multi-value -->
5693 <para>Parameterized.</para>
5698 <term>Parameter:</term>
5701 The name of a server-header tagger, as defined in one of the
5702 <link linkend="filter-file">filter files</link>.
5711 Server-header taggers are applied to each header on its own,
5712 and as the header isn't modified, each tagger <quote>sees</quote>
5716 Server-header taggers are executed before all other header actions
5717 that modify server headers. Their tags can be used to control
5718 all of the other server-header actions, the content filters
5719 and the crunch actions (<link linkend="redirect">redirect</link>
5720 and <link linkend="block">block</link>).
5723 Obviously crunching based on tags created by server-header taggers
5724 doesn't prevent the request from showing up in the server's log file.
5730 <term>Example usage (section):</term>
5734 # Tag every request with the declared content type
5735 {+client-header-filter{content-type}}
5746 <!-- ~~~~~ New section ~~~~~ -->
5747 <sect3 renderas="sect4" id="session-cookies-only">
5748 <title>session-cookies-only</title>
5752 <term>Typical use:</term>
5755 Allow only temporary <quote>session</quote> cookies (for the current
5756 browser session <emphasis>only</emphasis>).
5762 <term>Effect:</term>
5765 Deletes the <quote>expires</quote> field from <quote>Set-Cookie:</quote>
5766 server headers. Most browsers will not store such cookies permanently and
5767 forget them in between sessions.
5774 <!-- Boolean, Parameterized, Multi-value -->
5776 <para>Boolean.</para>
5781 <term>Parameter:</term>
5793 This is less strict than <literal><link linkend="crunch-incoming-cookies">crunch-incoming-cookies</link></literal> /
5794 <literal><link linkend="crunch-outgoing-cookies">crunch-outgoing-cookies</link></literal> and allows you to browse
5795 websites that insist or rely on setting cookies, without compromising your privacy too badly.
5798 Most browsers will not permanently store cookies that have been processed by
5799 <literal>session-cookies-only</literal> and will forget about them between sessions.
5800 This makes profiling cookies useless, but won't break sites which require cookies so
5801 that you can log in for transactions. This is generally turned on for all
5802 sites, and is the recommended setting.
5805 It makes <emphasis>no sense at all</emphasis> to use <literal>session-cookies-only</literal>
5806 together with <literal><link linkend="crunch-incoming-cookies">crunch-incoming-cookies</link></literal> or
5807 <literal><link linkend="crunch-outgoing-cookies">crunch-outgoing-cookies</link></literal>. If you do, cookies
5808 will be plainly killed.
5811 Note that it is up to the browser how it handles such cookies without an <quote>expires</quote>
5812 field. If you use an exotic browser, you might want to try it out to be sure.
5815 This setting also has no effect on cookies that may have been stored
5816 previously by the browser before starting <application>Privoxy</application>.
5817 These would have to be removed manually.
5820 <application>Privoxy</application> also uses
5821 the <link linkend="filter-content-cookies">content-cookies filter</link>
5822 to block some types of cookies. Content cookies are not effected by
5823 <literal>session-cookies-only</literal>.
5829 <term>Example usage:</term>
5832 <screen>+session-cookies-only</screen>
5840 <!-- ~~~~~ New section ~~~~~ -->
5841 <sect3 renderas="sect4" id="set-image-blocker">
5842 <title>set-image-blocker</title>
5846 <term>Typical use:</term>
5848 <para>Choose the replacement for blocked images</para>
5853 <term>Effect:</term>
5856 This action alone doesn't do anything noticeable. If <emphasis>both</emphasis>
5857 <literal><link linkend="block">block</link></literal> <emphasis>and</emphasis> <literal><link
5858 linkend="handle-as-image">handle-as-image</link></literal> <emphasis>also</emphasis>
5859 apply, i.e. if the request is to be blocked as an image,
5860 <emphasis>then</emphasis> the parameter of this action decides what will be
5861 sent as a replacement.
5868 <!-- Boolean, Parameterized, Multi-value -->
5870 <para>Parameterized.</para>
5875 <term>Parameter:</term>
5880 <quote>pattern</quote> to send a built-in checkerboard pattern image. The image is visually
5881 decent, scales very well, and makes it obvious where banners were busted.
5886 <quote>blank</quote> to send a built-in transparent image. This makes banners disappear
5887 completely, but makes it hard to detect where <application>Privoxy</application> has blocked
5888 images on a given page and complicates troubleshooting if <application>Privoxy</application>
5889 has blocked innocent images, like navigation icons.
5894 <quote><replaceable class="parameter">target-url</replaceable></quote> to
5895 send a redirect to <replaceable class="parameter">target-url</replaceable>. You can redirect
5896 to any image anywhere, even in your local filesystem via <quote>file:///</quote> URL.
5897 (But note that not all browsers support redirecting to a local file system).
5900 A good application of redirects is to use special <application>Privoxy</application>-built-in
5901 URLs, which send the built-in images, as <replaceable class="parameter">target-url</replaceable>.
5902 This has the same visual effect as specifying <quote>blank</quote> or <quote>pattern</quote> in
5903 the first place, but enables your browser to cache the replacement image, instead of requesting
5904 it over and over again.
5915 The URLs for the built-in images are <quote>http://config.privoxy.org/send-banner?type=<replaceable
5916 class="parameter">type</replaceable></quote>, where <replaceable class="parameter">type</replaceable> is
5917 either <quote>blank</quote> or <quote>pattern</quote>.
5920 There is a third (advanced) type, called <quote>auto</quote>. It is <emphasis>NOT</emphasis> to be
5921 used in <literal>set-image-blocker</literal>, but meant for use from <link linkend="filter-file">filters</link>.
5922 Auto will select the type of image that would have applied to the referring page, had it been an image.
5928 <term>Example usage:</term>
5934 <screen>+set-image-blocker{pattern}</screen>
5937 Redirect to the BSD daemon:
5940 <screen>+set-image-blocker{http://www.freebsd.org/gifs/dae_up3.gif}</screen>
5943 Redirect to the built-in pattern for better caching:
5946 <screen>+set-image-blocker{http://config.privoxy.org/send-banner?type=pattern}</screen>
5954 <!-- ~~~~~ New section ~~~~~ -->
5955 <sect3 renderas="sect4" id="treat-forbidden-connects-like-blocks">
5956 <title>treat-forbidden-connects-like-blocks</title>
5962 <term>Typical use:</term>
5964 <para>Block forbidden connects with an easy to find error message.</para>
5969 <term>Effect:</term>
5972 If this action is enabled, <application>Privoxy</application> no longer
5973 makes a difference between forbidden connects and ordinary blocks.
5980 <!-- Boolean, Parameterized, Multi-value -->
5982 <para>Boolean</para>
5987 <term>Parameter:</term>
5997 By default <application>Privoxy</application> answers
5998 <link linkend="limit-connect">forbidden <quote>Connect</quote> requests</link>
5999 with a short error message inside the headers. If the browser doesn't display
6000 headers (most don't), you just see an empty page.
6003 With this action enabled, <application>Privoxy</application> displays
6004 the message that is used for ordinary blocks instead. If you decide
6005 to make an exception for the page in question, you can do so by
6006 following the <quote>See why</quote> link.
6009 For <quote>Connect</quote> requests the clients tell
6010 <application>Privoxy</application> which host they are interested
6011 in, but not which document they plan to get later. As a result, the
6012 <quote>Go there anyway</quote> wouldn't work and is therefore suppressed.
6018 <term>Example usage:</term>
6021 <screen>+treat-forbidden-connects-like-blocks</screen>
6029 <!-- ~~~~~ New section ~~~~~ -->
6031 <title>Summary</title>
6033 Note that many of these actions have the potential to cause a page to
6034 misbehave, possibly even not to display at all. There are many ways
6035 a site designer may choose to design his site, and what HTTP header
6036 content, and other criteria, he may depend on. There is no way to have hard
6037 and fast rules for all sites. See the <link
6038 linkend="ACTIONSANAT">Appendix</link> for a brief example on troubleshooting
6044 <!-- ~~~~~ New section ~~~~~ -->
6045 <sect2 id="aliases">
6046 <title>Aliases</title>
6048 Custom <quote>actions</quote>, known to <application>Privoxy</application>
6049 as <quote>aliases</quote>, can be defined by combining other actions.
6050 These can in turn be invoked just like the built-in actions.
6051 Currently, an alias name can contain any character except space, tab,
6053 <quote>{</quote> and <quote>}</quote>, but we <emphasis>strongly
6054 recommend</emphasis> that you only use <quote>a</quote> to <quote>z</quote>,
6055 <quote>0</quote> to <quote>9</quote>, <quote>+</quote>, and <quote>-</quote>.
6056 Alias names are not case sensitive, and are not required to start with a
6057 <quote>+</quote> or <quote>-</quote> sign, since they are merely textually
6061 Aliases can be used throughout the actions file, but they <emphasis>must be
6062 defined in a special section at the top of the file!</emphasis>
6063 And there can only be one such section per actions file. Each actions file may
6064 have its own alias section, and the aliases defined in it are only visible
6068 There are two main reasons to use aliases: One is to save typing for frequently
6069 used combinations of actions, the other one is a gain in flexibility: If you
6070 decide once how you want to handle shops by defining an alias called
6071 <quote>shop</quote>, you can later change your policy on shops in
6072 <emphasis>one</emphasis> place, and your changes will take effect everywhere
6073 in the actions file where the <quote>shop</quote> alias is used. Calling aliases
6074 by their purpose also makes your actions files more readable.
6077 Currently, there is one big drawback to using aliases, though:
6078 <application>Privoxy</application>'s built-in web-based action file
6079 editor honors aliases when reading the actions files, but it expands
6080 them before writing. So the effects of your aliases are of course preserved,
6081 but the aliases themselves are lost when you edit sections that use aliases
6086 Now let's define some aliases...
6091 # Useful custom aliases we can use later.
6093 # Note the (required!) section header line and that this section
6094 # must be at the top of the actions file!
6098 # These aliases just save typing later:
6099 # (Note that some already use other aliases!)
6101 +crunch-all-cookies = +<link linkend="CRUNCH-INCOMING-COOKIES">crunch-incoming-cookies</link> +<link linkend="CRUNCH-OUTGOING-COOKIES">crunch-outgoing-cookies</link>
6102 -crunch-all-cookies = -<link linkend="CRUNCH-INCOMING-COOKIES">crunch-incoming-cookies</link> -<link linkend="CRUNCH-OUTGOING-COOKIES">crunch-outgoing-cookies</link>
6103 +block-as-image = +block +handle-as-image
6104 allow-all-cookies = -crunch-all-cookies -<link linkend="SESSION-COOKIES-ONLY">session-cookies-only</link> -<link linkend="FILTER-CONTENT-COOKIES">filter{content-cookies}</link>
6106 # These aliases define combinations of actions
6107 # that are useful for certain types of sites:
6109 fragile = -<link linkend="BLOCK">block</link> -<link linkend="FILTER">filter</link> -crunch-all-cookies -<link linkend="FAST-REDIRECTS">fast-redirects</link> -<link linkend="HIDE-REFERER">hide-referrer</link> -<link linkend="KILL-POPUPS">kill-popups</link> -<link linkend="PREVENT-COMPRESSION">prevent-compression</link>
6111 shop = -crunch-all-cookies -<link linkend="FILTER-ALL-POPUPS">filter{all-popups}</link> -<link linkend="KILL-POPUPS">kill-popups</link>
6113 # Short names for other aliases, for really lazy people ;-)
6115 c0 = +crunch-all-cookies
6116 c1 = -crunch-all-cookies</screen>
6120 ...and put them to use. These sections would appear in the lower part of an
6121 actions file and define exceptions to the default actions (as specified further
6122 up for the <quote>/</quote> pattern):
6127 # These sites are either very complex or very keen on
6128 # user data and require minimal interference to work:
6131 .office.microsoft.com
6132 .windowsupdate.microsoft.com
6133 # Gmail is really mail.google.com, not gmail.com
6137 # Allow cookies (for setting and retrieving your customer data)
6141 .worldpay.com # for quietpc.com
6144 # These shops require pop-ups:
6146 {-kill-popups -filter{all-popups} -filter{unsolicited-popups}}
6148 .overclockers.co.uk</screen>
6152 Aliases like <quote>shop</quote> and <quote>fragile</quote> are typically used for
6153 <quote>problem</quote> sites that require more than one action to be disabled
6154 in order to function properly.
6160 <!-- ~~~~~ New section ~~~~~ -->
6161 <sect2 id="act-examples">
6162 <title>Actions Files Tutorial</title>
6164 The above chapters have shown <link linkend="actions-file">which actions files
6165 there are and how they are organized</link>, how actions are <link
6166 linkend="actions">specified</link> and <link linkend="actions-apply">applied
6167 to URLs</link>, how <link linkend="af-patterns">patterns</link> work, and how to
6168 define and use <link linkend="aliases">aliases</link>. Now, let's look at an
6169 example <filename>default.action</filename> and <filename>user.action</filename>
6170 file and see how all these pieces come together:
6173 <sect3><title>default.action</title>
6176 Every config file should start with a short comment stating its purpose:
6180 <screen># Sample default.action file <ijbswa-developers@lists.sourceforge.net></screen>
6184 Then, since this is the <filename>default.action</filename> file, the
6185 first section is a special section for internal use that you needn't
6186 change or worry about:
6191 ##########################################################################
6192 # Settings -- Don't change! For internal Privoxy use ONLY.
6193 ##########################################################################
6196 for-privoxy-version=3.0</screen>
6200 After that comes the (optional) alias section. We'll use the example
6201 section from the above <link linkend="aliases">chapter on aliases</link>,
6202 that also explains why and how aliases are used:
6207 ##########################################################################
6209 ##########################################################################
6212 # These aliases just save typing later:
6213 # (Note that some already use other aliases!)
6215 +crunch-all-cookies = +<link linkend="CRUNCH-INCOMING-COOKIES">crunch-incoming-cookies</link> +<link linkend="CRUNCH-OUTGOING-COOKIES">crunch-outgoing-cookies</link>
6216 -crunch-all-cookies = -<link linkend="CRUNCH-INCOMING-COOKIES">crunch-incoming-cookies</link> -<link linkend="CRUNCH-OUTGOING-COOKIES">crunch-outgoing-cookies</link>
6217 +block-as-image = +block +handle-as-image
6218 mercy-for-cookies = -crunch-all-cookies -<link linkend="SESSION-COOKIES-ONLY">session-cookies-only</link> -<link linkend="FILTER-CONTENT-COOKIES">filter{content-cookies}</link>
6220 # These aliases define combinations of actions
6221 # that are useful for certain types of sites:
6223 fragile = -<link linkend="BLOCK">block</link> -<link linkend="FILTER">filter</link> -crunch-all-cookies -<link linkend="FAST-REDIRECTS">fast-redirects</link> -<link linkend="HIDE-REFERER">hide-referrer</link> -<link linkend="KILL-POPUPS">kill-popups</link>
6224 shop = -crunch-all-cookies -<link linkend="FILTER-ALL-POPUPS">filter{all-popups}</link> -<link linkend="KILL-POPUPS">kill-popups</link></screen>
6228 Now come the regular sections, i.e. sets of actions, accompanied
6229 by URL patterns to which they apply. Remember <emphasis>all actions
6230 are disabled when matching starts</emphasis>, so we have to explicitly
6231 enable the ones we want.
6235 The first regular section is probably the most important. It has only
6236 one pattern, <quote><literal>/</literal></quote>, but this pattern
6237 <link linkend="af-patterns">matches all URLs</link>. Therefore, the
6238 set of actions used in this <quote>default</quote> section <emphasis>will
6239 be applied to all requests as a start</emphasis>. It can be partly or
6240 wholly overridden by later matches further down this file, or in user.action,
6241 but it will still be largely responsible for your overall browsing
6246 Again, at the start of matching, all actions are disabled, so there is
6247 no real need to disable any actions here, but we will do that nonetheless,
6248 to have a complete listing for your reference. (Remember: a <quote>+</quote>
6249 preceding the action name enables the action, a <quote>-</quote> disables!).
6250 Also note how this long line has been made more readable by splitting it into
6251 multiple lines with line continuation.
6256 ##########################################################################
6257 # "Defaults" section:
6258 ##########################################################################
6260 -<link linkend="ADD-HEADER">add-header</link> \
6261 -<link linkend="CLIENT-HEADER-FILTER">client-header-filter{hide-tor-exit-notation}</link> \
6262 -<link linkend="BLOCK">block</link> \
6263 -<link linkend="CONTENT-TYPE-OVERWRITE">content-type-overwrite</link> \
6264 -<link linkend="CRUNCH-CLIENT-HEADER">crunch-client-header</link> \
6265 -<link linkend="CRUNCH-IF-NONE-MATCH">crunch-if-none-match</link> \
6266 -<link linkend="CRUNCH-INCOMING-COOKIES">crunch-incoming-cookies</link> \
6267 -<link linkend="CRUNCH-SERVER-HEADER">crunch-server-header</link> \
6268 -<link linkend="CRUNCH-OUTGOING-COOKIES">crunch-outgoing-cookies</link> \
6269 +<link linkend="DEANIMATE-GIFS">deanimate-gifs</link> \
6270 -<link linkend="DOWNGRADE-HTTP-VERSION">downgrade-http-version</link> \
6271 -<link linkend="FAST-REDIRECTS">fast-redirects{check-decoded-url}</link> \
6272 -<link linkend="FILTER-JS-ANNOYANCES">filter{js-annoyances}</link> \
6273 -<link linkend="FILTER-JS-EVENTS">filter{js-events}</link> \
6274 +<link linkend="FILTER-HTML-ANNOYANCES">filter{html-annoyances}</link> \
6275 -<link linkend="FILTER-CONTENT-COOKIES">filter{content-cookies}</link> \
6276 +<link linkend="FILTER-REFRESH-TAGS">filter{refresh-tags}</link> \
6277 -<link linkend="FILTER-UNSOLICITED-POPUPS">filter{unsolicited-popups}</link> \
6278 -<link linkend="FILTER-ALL-POPUPS">filter{all-popups}</link> \
6279 -<link linkend="FILTER-IMG-REORDER">filter{img-reorder}</link> \
6280 -<link linkend="FILTER-BANNERS-BY-SIZE">filter{banners-by-size}</link> \
6281 -<link linkend="FILTER-BANNERS-BY-LINK">filter{banners-by-link}</link> \
6282 +<link linkend="FILTER-WEBBUGS">filter{webbugs}</link> \
6283 -<link linkend="FILTER-TINY-TEXTFORMS">filter{tiny-textforms}</link> \
6284 -<link linkend="FILTER-JUMPING-WINDOWS">filter{jumping-windows}</link> \
6285 -<link linkend="FILTER-FRAMESET-BORDERS">filter{frameset-borders}</link> \
6286 -<link linkend="FILTER-DEMORONIZER">filter{demoronizer}</link> \
6287 -<link linkend="FILTER-SHOCKWAVE-FLASH">filter{shockwave-flash}</link> \
6288 -<link linkend="FILTER-QUICKTIME-KIOSKMODE">filter{quicktime-kioskmode}</link> \
6289 -<link linkend="FILTER-FUN">filter{fun}</link> \
6290 -<link linkend="FILTER-CRUDE-PARENTAL">filter{crude-parental}</link> \
6291 +<link linkend="FILTER-IE-EXPLOITS">filter{ie-exploits}</link> \
6292 -<link linkend="FILTER-GOOGLE">filter{google}</link> \
6293 -<link linkend="FILTER-YAHOO">filter{yahoo}</link> \
6294 -<link linkend="FILTER-MSN">filter{msn}</link> \
6295 -<link linkend="FILTER-BLOGSPOT">filter{blogspot}</link> \
6296 -<link linkend="FILTER-NO-PING">filter{no-ping}</link> \
6297 -<link linkend="FORCE-TEXT-MODE">force-text-mode</link> \
6298 -<link linkend="HANDLE-AS-EMPTY-DOCUMENT">handle-as-empty-document</link> \
6299 -<link linkend="HANDLE-AS-IMAGE">handle-as-image</link> \
6300 -<link linkend="HIDE-ACCEPT-LANGUAGE">hide-accept-language</link> \
6301 -<link linkend="HIDE-CONTENT-DISPOSITION">hide-content-disposition</link> \
6302 -<link linkend="HIDE-IF-MODIFIED-SINCE">hide-if-modified-since</link> \
6303 +<link linkend="HIDE-FORWARDED-FOR-HEADERS">hide-forwarded-for-headers</link> \
6304 +<link linkend="HIDE-FROM-HEADER">hide-from-header{block}</link> \
6305 +<link linkend="HIDE-REFERER">hide-referrer{forge}</link> \
6306 -<link linkend="HIDE-USER-AGENT">hide-user-agent</link> \
6307 -<link linkend="INSPECT-JPEGS">inspect-jpegs</link> \
6308 -<link linkend="KILL-POPUPS">kill-popups</link> \
6309 -<link linkend="LIMIT-CONNECT">limit-connect</link> \
6310 +<link linkend="PREVENT-COMPRESSION">prevent-compression</link> \
6311 -<link linkend="OVERWRITE-LAST-MODIFIED">overwrite-last-modified</link> \
6312 -<link linkend="REDIRECT">redirect</link> \
6313 -<link linkend="SEND-VANILLA-WAFER">send-vanilla-wafer</link> \
6314 -<link linkend="SEND-WAFER">send-wafer</link> \
6315 -<link linkend="SERVER-HEADER-FILTER">server-header-filter{xml-to-html}</link> \
6316 -<link linkend="SERVER-HEADER-FILTER">server-header-filter{html-to-xml}</link> \
6317 +<link linkend="SESSION-COOKIES-ONLY">session-cookies-only</link> \
6318 +<link linkend="SET-IMAGE-BLOCKER">set-image-blocker{pattern}</link> \
6319 -<link linkend="TREAT-FORBIDDEN-CONNECTS-LIKE-BLOCKS">treat-forbidden-connects-like-blocks</link> \
6321 / # forward slash will match *all* potential URL patterns.</screen>
6325 The default behavior is now set. Note that some actions, like not hiding
6326 the user agent, are part of a <quote>general policy</quote> that applies
6327 universally and won't get any exceptions defined later. Other choices,
6328 like not blocking (which is <emphasis>understandably</emphasis> the
6329 default!) need exceptions, i.e. we need to specify explicitly what we
6330 want to block in later sections.
6334 The first of our specialized sections is concerned with <quote>fragile</quote>
6335 sites, i.e. sites that require minimum interference, because they are either
6336 very complex or very keen on tracking you (and have mechanisms in place that
6337 make them unusable for people who avoid being tracked). We will simply use
6338 our pre-defined <literal>fragile</literal> alias instead of stating the list
6339 of actions explicitly:
6344 ##########################################################################
6345 # Exceptions for sites that'll break under the default action set:
6346 ##########################################################################
6348 # "Fragile" Use a minimum set of actions for these sites (see alias above):
6351 .office.microsoft.com # surprise, surprise!
6352 .windowsupdate.microsoft.com
6353 mail.google.com</screen>
6357 Shopping sites are not as fragile, but they typically
6358 require cookies to log in, and pop-up windows for shopping
6359 carts or item details. Again, we'll use a pre-defined alias:
6368 .worldpay.com # for quietpc.com
6370 .scan.co.uk</screen>
6373 <!-- No longer needed BEGIN OF COMMENTED OUT BLOCK
6376 Then, there are sites which rely on pop-up windows (yuck!) to work.
6377 Since we made pop-up-killing our default above, we need to make exceptions
6378 now. <ulink url="http://www.mozilla.org/">Mozilla</ulink> users, who
6379 can turn on smart handling of unwanted pop-ups in their browsers, can
6381 -<literal><link linkend="FILTER-ALL-POPUPS">filter{popups}</link></literal> (and
6382 -<literal><link linkend="KILL-POPUPS">kill-popups</link></literal>) above
6383 and hence don't need this section. Anyway, disabling an already disabled
6384 action doesn't hurt, so we'll define our exceptions regardless of what was
6385 chosen in the defaults section:
6390 # These sites require pop-ups too :(
6392 { -<link linkend="KILL-POPUPS">kill-popups</link> -<link linkend="FILTER-ALL-POPUPS">filter{popups}</link> }
6395 .deutsche-bank-24.de</screen>
6398 END OF COMMENTED OUT BLOCK -->
6401 The <literal><link linkend="FAST-REDIRECTS">fast-redirects</link></literal>
6402 action, which we enabled per default above, breaks some sites. So disable
6403 it for popular sites where we know it misbehaves:
6408 { -<link linkend="FAST-REDIRECTS">fast-redirects</link> }
6412 .altavista.com/.*(like|url|link):http
6413 .altavista.com/trans.*urltext=http
6414 .nytimes.com</screen>
6418 It is important that <application>Privoxy</application> knows which
6419 URLs belong to images, so that <emphasis>if</emphasis> they are to
6420 be blocked, a substitute image can be sent, rather than an HTML page.
6421 Contacting the remote site to find out is not an option, since it
6422 would destroy the loading time advantage of banner blocking, and it
6423 would feed the advertisers (in terms of money <emphasis>and</emphasis>
6424 information). We can mark any URL as an image with the <literal><link
6425 linkend="handle-as-image">handle-as-image</link></literal> action,
6426 and marking all URLs that end in a known image file extension is a
6432 ##########################################################################
6434 ##########################################################################
6436 # Define which file types will be treated as images, in case they get
6437 # blocked further down this file:
6439 { +<link linkend="HANDLE-AS-IMAGE">handle-as-image</link> }
6440 /.*\.(gif|jpe?g|png|bmp|ico)$</screen>
6444 And then there are known banner sources. They often use scripts to
6445 generate the banners, so it won't be visible from the URL that the
6446 request is for an image. Hence we block them <emphasis>and</emphasis>
6447 mark them as images in one go, with the help of our
6448 <literal>+block-as-image</literal> alias defined above. (We could of
6449 course just as well use <literal>+<link linkend="block">block</link>
6450 +<link linkend="handle-as-image">handle-as-image</link></literal> here.)
6451 Remember that the type of the replacement image is chosen by the
6452 <literal><link linkend="set-image-blocker">set-image-blocker</link></literal>
6453 action. Since all URLs have matched the default section with its
6454 <literal>+<link linkend="set-image-blocker">set-image-blocker</link>{pattern}</literal>
6455 action before, it still applies and needn't be repeated:
6460 # Known ad generators:
6465 .ad.*.doubleclick.net
6466 .a.yimg.com/(?:(?!/i/).)*$
6467 .a[0-9].yimg.com/(?:(?!/i/).)*$
6473 One of the most important jobs of <application>Privoxy</application>
6474 is to block banners. Many of these can be <quote>blocked</quote>
6475 by the <literal><link linkend="filter">filter</link>{banners-by-size}</literal>
6476 action, which we enabled above, and which deletes the references to banner
6477 images from the pages while they are loaded, so the browser doesn't request
6478 them anymore, and hence they don't need to be blocked here. But this naturally
6479 doesn't catch all banners, and some people choose not to use filters, so we
6480 need a comprehensive list of patterns for banner URLs here, and apply the
6481 <literal><link linkend="block">block</link></literal> action to them.
6484 First comes many generic patterns, which do most of the work, by
6485 matching typical domain and path name components of banners. Then comes
6486 a list of individual patterns for specific sites, which is omitted here
6487 to keep the example short:
6492 ##########################################################################
6493 # Block these fine banners:
6494 ##########################################################################
6495 { <link linkend="BLOCK">+block</link> }
6503 /.*count(er)?\.(pl|cgi|exe|dll|asp|php[34]?)
6504 /(?:.*/)?(publicite|werbung|rekla(ma|me|am)|annonse|maino(kset|nta|s)?)/
6506 # Site-specific patterns (abbreviated):
6508 .hitbox.com</screen>
6512 It's quite remarkable how many advertisers actually call their banner
6513 servers ads.<replaceable>company</replaceable>.com, or call the directory
6514 in which the banners are stored simply <quote>banners</quote>. So the above
6515 generic patterns are surprisingly effective.
6518 But being very generic, they necessarily also catch URLs that we don't want
6519 to block. The pattern <literal>.*ads.</literal> e.g. catches
6520 <quote>nasty-<emphasis>ads</emphasis>.nasty-corp.com</quote> as intended,
6521 but also <quote>downlo<emphasis>ads</emphasis>.sourcefroge.net</quote> or
6522 <quote><emphasis>ads</emphasis>l.some-provider.net.</quote> So here come some
6523 well-known exceptions to the <literal>+<link linkend="BLOCK">block</link></literal>
6527 Note that these are exceptions to exceptions from the default! Consider the URL
6528 <quote>downloads.sourcefroge.net</quote>: Initially, all actions are deactivated,
6529 so it wouldn't get blocked. Then comes the defaults section, which matches the
6530 URL, but just deactivates the <literal><link linkend="BLOCK">block</link></literal>
6531 action once again. Then it matches <literal>.*ads.</literal>, an exception to the
6532 general non-blocking policy, and suddenly
6533 <literal><link linkend="BLOCK">+block</link></literal> applies. And now, it'll match
6534 <literal>.*loads.</literal>, where <literal><link linkend="BLOCK">-block</link></literal>
6535 applies, so (unless it matches <emphasis>again</emphasis> further down) it ends up
6536 with no <literal><link linkend="BLOCK">block</link></literal> action applying.
6541 ##########################################################################
6542 # Save some innocent victims of the above generic block patterns:
6543 ##########################################################################
6547 { -<link linkend="BLOCK">block</link> }
6548 adv[io]*. # (for advogato.org and advice.*)
6549 adsl. # (has nothing to do with ads)
6550 adobe. # (has nothing to do with ads either)
6551 ad[ud]*. # (adult.* and add.*)
6552 .edu # (universities don't host banners (yet!))
6553 .*loads. # (downloads, uploads etc)
6561 www.globalintersec.com/adv # (adv = advanced)
6562 www.ugu.com/sui/ugu/adv</screen>
6566 Filtering source code can have nasty side effects,
6567 so make an exception for our friends at sourceforge.net,
6568 and all paths with <quote>cvs</quote> in them. Note that
6569 <literal>-<link linkend="FILTER">filter</link></literal>
6570 disables <emphasis>all</emphasis> filters in one fell swoop!
6575 # Don't filter code!
6577 { -<link linkend="FILTER">filter</link> }
6582 .sourceforge.net</screen>
6586 The actual <filename>default.action</filename> is of course much more
6587 comprehensive, but we hope this example made clear how it works.
6592 <sect3><title>user.action</title>
6595 So far we are painting with a broad brush by setting general policies,
6596 which would be a reasonable starting point for many people. Now,
6597 you might want to be more specific and have customized rules that
6598 are more suitable to your personal habits and preferences. These would
6599 be for narrowly defined situations like your ISP or your bank, and should
6600 be placed in <filename>user.action</filename>, which is parsed after all other
6601 actions files and hence has the last word, over-riding any previously
6602 defined actions. <filename>user.action</filename> is also a
6603 <emphasis>safe</emphasis> place for your personal settings, since
6604 <filename>default.action</filename> is actively maintained by the
6605 <application>Privoxy</application> developers and you'll probably want
6606 to install updated versions from time to time.
6610 So let's look at a few examples of things that one might typically do in
6611 <filename>user.action</filename>:
6615 <!-- brief sample user.action here -->
6619 # My user.action file. <fred@foobar.com></screen>
6623 As <link linkend="aliases">aliases</link> are local to the actions
6624 file that they are defined in, you can't use the ones from
6625 <filename>default.action</filename>, unless you repeat them here:
6630 # Aliases are local to the file they are defined in.
6631 # (Re-)define aliases for this file:
6635 # These aliases just save typing later, and the alias names should
6636 # be self explanatory.
6638 +crunch-all-cookies = +crunch-incoming-cookies +crunch-outgoing-cookies
6639 -crunch-all-cookies = -crunch-incoming-cookies -crunch-outgoing-cookies
6640 allow-all-cookies = -crunch-all-cookies -session-cookies-only
6641 allow-popups = -filter{all-popups} -kill-popups
6642 +block-as-image = +block +handle-as-image
6643 -block-as-image = -block
6645 # These aliases define combinations of actions that are useful for
6646 # certain types of sites:
6648 fragile = -block -crunch-all-cookies -filter -fast-redirects -hide-referrer -kill-popups
6649 shop = -crunch-all-cookies allow-popups
6651 # Allow ads for selected useful free sites:
6653 allow-ads = -block -filter{banners-by-size} -filter{banners-by-link}
6655 # Alias for specific file types that are text, but might have conflicting
6656 # MIME types. We want the browser to force these to be text documents.
6657 handle-as-text = -<link linkend="FILTER">filter</link> +-<link linkend="content-type-overwrite">content-type-overwrite{text/plain}</link> +-<link linkend="FORCE-TEXT-MODE">force-text-mode</link> -<link linkend="HIDE-CONTENT-DISPOSITION">hide-content-disposition</link></screen>
6662 Say you have accounts on some sites that you visit regularly, and
6663 you don't want to have to log in manually each time. So you'd like
6664 to allow persistent cookies for these sites. The
6665 <literal>allow-all-cookies</literal> alias defined above does exactly
6666 that, i.e. it disables crunching of cookies in any direction, and the
6667 processing of cookies to make them only temporary.
6672 { allow-all-cookies }
6676 .redhat.com</screen>
6680 Your bank is allergic to some filter, but you don't know which, so you disable them all:
6685 { -<link linkend="FILTER">filter</link> }
6686 .your-home-banking-site.com</screen>
6690 Some file types you may not want to filter for various reasons:
6695 # Technical documentation is likely to contain strings that might
6696 # erroneously get altered by the JavaScript-oriented filters:
6701 # And this stupid host sends streaming video with a wrong MIME type,
6702 # so that Privoxy thinks it is getting HTML and starts filtering:
6704 stupid-server.example.com/</screen>
6708 Example of a simple <link linkend="BLOCK">block</link> action. Say you've
6709 seen an ad on your favourite page on example.com that you want to get rid of.
6710 You have right-clicked the image, selected <quote>copy image location</quote>
6711 and pasted the URL below while removing the leading http://, into a
6712 <literal>{ +block }</literal> section. Note that <literal>{ +handle-as-image
6713 }</literal> need not be specified, since all URLs ending in
6714 <literal>.gif</literal> will be tagged as images by the general rules as set
6715 in default.action anyway:
6720 { +<link linkend="BLOCK">block</link> }
6721 www.example.com/nasty-ads/sponsor\.gif
6722 another.popular.site.net/more/junk/here/</screen>
6726 The URLs of dynamically generated banners, especially from large banner
6727 farms, often don't use the well-known image file name extensions, which
6728 makes it impossible for <application>Privoxy</application> to guess
6729 the file type just by looking at the URL.
6730 You can use the <literal>+block-as-image</literal> alias defined above for
6732 Note that objects which match this rule but then turn out NOT to be an
6733 image are typically rendered as a <quote>broken image</quote> icon by the
6734 browser. Use cautiously.
6743 ar.atwola.com/</screen>
6747 Now you noticed that the default configuration breaks Forbes Magazine,
6748 but you were too lazy to find out which action is the culprit, and you
6749 were again too lazy to give <link linkend="contact">feedback</link>, so
6750 you just used the <literal>fragile</literal> alias on the site, and
6751 -- <emphasis>whoa!</emphasis> -- it worked. The <literal>fragile</literal>
6752 aliases disables those actions that are most likely to break a site. Also,
6753 good for testing purposes to see if it is <application>Privoxy</application>
6754 that is causing the problem or not. We later find other regular sites
6755 that misbehave, and add those to our personalized list of troublemakers:
6763 .mybank.com</screen>
6767 You like the <quote>fun</quote> text replacements in <filename>default.filter</filename>,
6768 but it is disabled in the distributed actions file. (My colleagues on the team just
6769 don't have a sense of humour, that's why! ;-). So you'd like to turn it on in your private,
6770 update-safe config, once and for all:
6775 { +<link linkend="filter-fun">filter{fun}</link> }
6776 / # For ALL sites!</screen>
6780 Note that the above is not really a good idea: There are exceptions
6781 to the filters in <filename>default.action</filename> for things that
6782 really shouldn't be filtered, like code on CVS->Web interfaces. Since
6783 <filename>user.action</filename> has the last word, these exceptions
6784 won't be valid for the <quote>fun</quote> filtering specified here.
6788 You might also worry about how your favourite free websites are
6789 funded, and find that they rely on displaying banner advertisements
6790 to survive. So you might want to specifically allow banners for those
6791 sites that you feel provide value to you:
6803 Note that <literal>allow-ads</literal> has been aliased to
6804 <literal>-<link linkend="block">block</link></literal>,
6805 <literal>-<link linkend="filter-banners-by-size">filter{banners-by-size}</link></literal>, and
6806 <literal>-<link linkend="filter-banners-by-link">filter{banners-by-link}</link></literal> above.
6810 Invoke another alias here to force an over-ride of the MIME type <literal>
6811 application/x-sh</literal> which typically would open a download type
6812 dialog. In my case, I want to look at the shell script, and then I can save
6813 it should I choose to.
6823 <filename>user.action</filename> is generally the best place to define
6824 exceptions and additions to the default policies of
6825 <filename>default.action</filename>. Some actions are safe to have their
6826 default policies set here though. So let's set a default policy to have a
6827 <quote>blank</quote> image as opposed to the checkerboard pattern for
6828 <emphasis>ALL</emphasis> sites. <quote>/</quote> of course matches all URL
6834 { +<link linkend="set-image-blocker">set-image-blocker{blank}</link> }
6835 / # ALL sites</screen>
6841 <!-- ~ End section ~ -->
6845 <!-- ~ End section ~ -->
6847 <!-- ~~~~~~~~ New section Header ~~~~~~~~~ -->
6849 <sect1 id="filter-file">
6850 <title>Filter Files</title>
6853 On-the-fly text substitutions need
6854 to be defined in a <quote>filter file</quote>. Once defined, they
6855 can then be invoked as an <quote>action</quote>.
6859 &my-app; supports three different filter actions:
6860 <literal><link linkend="filter">filter</link></literal> to
6861 rewrite the content that is send to the client,
6862 <literal><link linkend="client-header-filter">client-header-filter</link></literal>
6863 to rewrite headers that are send by the client, and
6864 <literal><link linkend="server-header-filter">server-header-filter</link></literal>
6865 to rewrite headers that are send by the server, and
6869 &my-app; also supports two tagger actions:
6870 <literal><link linkend="client-header-tagger">client-header-tagger</link></literal>
6872 <literal><link linkend="server-header-tagger">server-header-tagger</link></literal>.
6873 Taggers and filters use the same syntax in the filter files, the differnce
6874 is that taggers don't modify the text they are filtering, but use a rewritten
6875 version of the filtered text as tag. The tags can then be used to change the
6876 applying actions through sections with <link linkend="tag-pattern">tag-patterns</link>.
6881 Multiple filter files can be defined through the <literal> <link
6882 linkend="filterfile">filterfile</link></literal> config directive. The filters
6883 as supplied by the developers will be found in
6884 <filename>default.filter</filename>. It is recommended that any locally
6885 defined or modified filters go in a separately defined file such as
6886 <filename>user.filter</filename>.
6891 Command tasks for content filters are to eliminate common annoyances in
6892 HTML and JavaScript, such as pop-up windows,
6893 exit consoles, crippled windows without navigation tools, the
6894 infamous <BLINK> tag etc, to suppress images with certain
6895 width and height attributes (standard banner sizes or web-bugs),
6896 or just to have fun.
6900 Content filtering works on any text-based document type, including
6901 HTML, JavaScript, CSS etc. (all <literal>text/*</literal>
6902 MIME types, <emphasis>except</emphasis> <literal>text/plain</literal>).
6903 Substitutions are made at the source level, so if you want to <quote>roll
6904 your own</quote> filters, you should first be familiar with HTML syntax,
6905 and, of course, regular expressions.
6909 Just like the <link linkend="actions-file">actions files</link>, the
6910 filter file is organized in sections, which are called <emphasis>filters</emphasis>
6911 here. Each filter consists of a heading line, that starts with one of the
6912 <emphasis>keywords</emphasis> <literal>FILTER:</literal>,
6913 <literal>CLIENT-HEADER-FILTER:</literal> or <literal>SERVER-HEADER-FILTER:</literal>
6914 followed by the filter's <emphasis>name</emphasis>, and a short (one line)
6915 <emphasis>description</emphasis> of what it does. Below that line
6916 come the <emphasis>jobs</emphasis>, i.e. lines that define the actual
6917 text substitutions. By convention, the name of a filter
6918 should describe what the filter <emphasis>eliminates</emphasis>. The
6919 comment is used in the <ulink url="http://config.privoxy.org/">web-based
6920 user interface</ulink>.
6924 Once a filter called <replaceable>name</replaceable> has been defined
6925 in the filter file, it can be invoked by using an action of the form
6926 +<literal><link linkend="filter">filter</link>{<replaceable>name</replaceable>}</literal>
6927 in any <link linkend="actions-file">actions file</link>.
6931 Filter definitions start with a header line that contains the filter
6932 type, the filter name and the filter description.
6933 A content filter header line for a filter called <quote>foo</quote> could look
6938 <screen>FILTER: foo Replace all "foo" with "bar"</screen>
6942 Below that line, and up to the next header line, come the jobs that
6943 define what text replacements the filter executes. They are specified
6944 in a syntax that imitates <ulink url="http://www.perl.org/">Perl</ulink>'s
6945 <literal>s///</literal> operator. If you are familiar with Perl, you
6946 will find this to be quite intuitive, and may want to look at the
6947 PCRS documentation for the subtle differences to Perl behaviour. Most
6948 notably, the non-standard option letter <literal>U</literal> is supported,
6949 which turns the default to ungreedy matching.
6954 <ulink url="http://en.wikipedia.org/wiki/Regular_expressions"><quote>Regular
6955 Expressions</quote></ulink>, you might want to take a look at
6956 the <link linkend="regex">Appendix on regular expressions</link>, and
6957 see the <ulink url="http://perldoc.perl.org/perlre.html">Perl
6959 <ulink url="http://perldoc.perl.org/perlop.html">the
6960 <literal>s///</literal> operator's syntax</ulink> and <ulink
6961 url="http://perldoc.perl.org/perlre.html">Perl-style regular
6962 expressions</ulink> in general.
6963 The below examples might also help to get you started.
6967 <!-- ~~~~~~~~ New section Header ~~~~~~~~~ -->
6969 <sect2><title>Filter File Tutorial</title>
6971 Now, let's complete our <quote>foo</quote> content filter. We have already defined
6972 the heading, but the jobs are still missing. Since all it does is to replace
6973 <quote>foo</quote> with <quote>bar</quote>, there is only one (trivial) job
6978 <screen>s/foo/bar/</screen>
6982 But wait! Didn't the comment say that <emphasis>all</emphasis> occurrences
6983 of <quote>foo</quote> should be replaced? Our current job will only take
6984 care of the first <quote>foo</quote> on each page. For global substitution,
6985 we'll need to add the <literal>g</literal> option:
6989 <screen>s/foo/bar/g</screen>
6993 Our complete filter now looks like this:
6996 <screen>FILTER: foo Replace all "foo" with "bar"
6997 s/foo/bar/g</screen>
7001 Let's look at some real filters for more interesting examples. Here you see
7002 a filter that protects against some common annoyances that arise from JavaScript
7003 abuse. Let's look at its jobs one after the other:
7009 FILTER: js-annoyances Get rid of particularly annoying JavaScript abuse
7011 # Get rid of JavaScript referrer tracking. Test page: http://www.randomoddness.com/untitled.htm
7013 s|(<script.*)document\.referrer(.*</script>)|$1"Not Your Business!"$2|Usg</screen>
7017 Following the header line and a comment, you see the job. Note that it uses
7018 <literal>|</literal> as the delimiter instead of <literal>/</literal>, because
7019 the pattern contains a forward slash, which would otherwise have to be escaped
7020 by a backslash (<literal>\</literal>).
7024 Now, let's examine the pattern: it starts with the text <literal><script.*</literal>
7025 enclosed in parentheses. Since the dot matches any character, and <literal>*</literal>
7026 means: <quote>Match an arbitrary number of the element left of myself</quote>, this
7027 matches <quote><script</quote>, followed by <emphasis>any</emphasis> text, i.e.
7028 it matches the whole page, from the start of the first <script> tag.
7032 That's more than we want, but the pattern continues: <literal>document\.referrer</literal>
7033 matches only the exact string <quote>document.referrer</quote>. The dot needed to
7034 be <emphasis>escaped</emphasis>, i.e. preceded by a backslash, to take away its
7035 special meaning as a joker, and make it just a regular dot. So far, the meaning is:
7036 Match from the start of the first <script> tag in a the page, up to, and including,
7037 the text <quote>document.referrer</quote>, if <emphasis>both</emphasis> are present
7038 in the page (and appear in that order).
7042 But there's still more pattern to go. The next element, again enclosed in parentheses,
7043 is <literal>.*</script></literal>. You already know what <literal>.*</literal>
7044 means, so the whole pattern translates to: Match from the start of the first <script>
7045 tag in a page to the end of the last <script> tag, provided that the text
7046 <quote>document.referrer</quote> appears somewhere in between.
7050 This is still not the whole story, since we have ignored the options and the parentheses:
7051 The portions of the page matched by sub-patterns that are enclosed in parentheses, will be
7052 remembered and be available through the variables <literal>$1, $2, ...</literal> in
7053 the substitute. The <literal>U</literal> option switches to ungreedy matching, which means
7054 that the first <literal>.*</literal> in the pattern will only <quote>eat up</quote> all
7055 text in between <quote><script</quote> and the <emphasis>first</emphasis> occurrence
7056 of <quote>document.referrer</quote>, and that the second <literal>.*</literal> will
7057 only span the text up to the <emphasis>first</emphasis> <quote></script></quote>
7058 tag. Furthermore, the <literal>s</literal> option says that the match may span
7059 multiple lines in the page, and the <literal>g</literal> option again means that the
7060 substitution is global.
7064 So, to summarize, the pattern means: Match all scripts that contain the text
7065 <quote>document.referrer</quote>. Remember the parts of the script from
7066 (and including) the start tag up to (and excluding) the string
7067 <quote>document.referrer</quote> as <literal>$1</literal>, and the part following
7068 that string, up to and including the closing tag, as <literal>$2</literal>.
7072 Now the pattern is deciphered, but wasn't this about substituting things? So
7073 lets look at the substitute: <literal>$1"Not Your Business!"$2</literal> is
7074 easy to read: The text remembered as <literal>$1</literal>, followed by
7075 <literal>"Not Your Business!"</literal> (<emphasis>including</emphasis>
7076 the quotation marks!), followed by the text remembered as <literal>$2</literal>.
7077 This produces an exact copy of the original string, with the middle part
7078 (the <quote>document.referrer</quote>) replaced by <literal>"Not Your
7079 Business!"</literal>.
7083 The whole job now reads: Replace <quote>document.referrer</quote> by
7084 <literal>"Not Your Business!"</literal> wherever it appears inside a
7085 <script> tag. Note that this job won't break JavaScript syntax,
7086 since both the original and the replacement are syntactically valid
7087 string objects. The script just won't have access to the referrer
7088 information anymore.
7092 We'll show you two other jobs from the JavaScript taming department, but
7093 this time only point out the constructs of special interest:
7098 # The status bar is for displaying link targets, not pointless blahblah
7100 s/window\.status\s*=\s*(['"]).*?\1/dUmMy=1/ig</screen>
7104 <literal>\s</literal> stands for whitespace characters (space, tab, newline,
7105 carriage return, form feed), so that <literal>\s*</literal> means: <quote>zero
7106 or more whitespace</quote>. The <literal>?</literal> in <literal>.*?</literal>
7107 makes this matching of arbitrary text ungreedy. (Note that the <literal>U</literal>
7108 option is not set). The <literal>['"]</literal> construct means: <quote>a single
7109 <emphasis>or</emphasis> a double quote</quote>. Finally, <literal>\1</literal> is
7110 a back-reference to the first parenthesis just like <literal>$1</literal> above,
7111 with the difference that in the <emphasis>pattern</emphasis>, a backslash indicates
7112 a back-reference, whereas in the <emphasis>substitute</emphasis>, it's the dollar.
7116 So what does this job do? It replaces assignments of single- or double-quoted
7117 strings to the <quote>window.status</quote> object with a dummy assignment
7118 (using a variable name that is hopefully odd enough not to conflict with
7119 real variables in scripts). Thus, it catches many cases where e.g. pointless
7120 descriptions are displayed in the status bar instead of the link target when
7121 you move your mouse over links.
7126 # Kill OnUnload popups. Yummy. Test: http://www.zdnet.com/zdsubs/yahoo/tree/yfs.html
7128 s/(<body [^>]*)onunload(.*>)/$1never$2/iU</screen>
7133 <ulink url="http://www.w3.org/TR/2000/REC-DOM-Level-2-Events-20001113/events.html#Events-eventgroupings-htmlevents">OnUnload
7134 event binding</ulink> in the HTML DOM was a <emphasis>CRIME</emphasis>.
7135 When I close a browser window, I want it to close and die. Basta.
7136 This job replaces the <quote>onunload</quote> attribute in
7137 <quote><body></quote> tags with the dummy word <literal>never</literal>.
7138 Note that the <literal>i</literal> option makes the pattern matching
7139 case-insensitive. Also note that ungreedy matching alone doesn't always guarantee
7140 a minimal match: In the first parenthesis, we had to use <literal>[^>]*</literal>
7141 instead of <literal>.*</literal> to prevent the match from exceeding the
7142 <body> tag if it doesn't contain <quote>OnUnload</quote>, but the page's
7147 The last example is from the fun department:
7152 FILTER: fun Fun text replacements
7154 # Spice the daily news:
7156 s/microsoft(?!\.com)/MicroSuck/ig</screen>
7160 Note the <literal>(?!\.com)</literal> part (a so-called negative lookahead)
7161 in the job's pattern, which means: Don't match, if the string
7162 <quote>.com</quote> appears directly following <quote>microsoft</quote>
7163 in the page. This prevents links to microsoft.com from being trashed, while
7164 still replacing the word everywhere else.
7169 # Buzzword Bingo (example for extended regex syntax)
7171 s* industry[ -]leading \
7173 | customer[ -]focused \
7174 | market[ -]driven \
7175 | award[ -]winning # Comments are OK, too! \
7176 | high[ -]performance \
7177 | solutions[ -]based \
7181 *<font color="red"><b>BINGO!</b></font> \
7186 The <literal>x</literal> option in this job turns on extended syntax, and allows for
7187 e.g. the liberal use of (non-interpreted!) whitespace for nicer formatting.
7195 <!-- ~~~~~~~~ New section Header ~~~~~~~~~ -->
7197 <sect2 id="predefined-filters"><title>The Pre-defined Filters</title>
7201 Note each filter is also listed in the +filter action section above. Please
7202 keep these listings in sync.
7207 The distribution <filename>default.filter</filename> file contains a selection of
7208 pre-defined filters for your convenience:
7213 <term><emphasis>js-annoyances</emphasis></term>
7216 The purpose of this filter is to get rid of particularly annoying JavaScript abuse.
7221 replaces JavaScript references to the browser's referrer information
7222 with the string "Not Your Business!". This compliments the <literal><link
7223 linkend="hide-referrer">hide-referrer</link></literal> action on the content level.
7228 removes the bindings to the DOM's
7229 <ulink url="http://www.w3.org/TR/2000/REC-DOM-Level-2-Events-20001113/events.html#Events-eventgroupings-htmlevents">unload
7230 event</ulink> which we feel has no right to exist and is responsible for most <quote>exit consoles</quote>, i.e.
7231 nasty windows that pop up when you close another one.
7236 removes code that causes new windows to be opened with undesired properties, such as being
7237 full-screen, non-resizeable, without location, status or menu bar etc.
7243 Use with caution. This is an aggressive filter, and can break sites that
7244 rely heavily on JavaScript.
7250 <term><emphasis>js-events</emphasis></term>
7253 This is a very radical measure. It removes virtually all JavaScript event bindings, which
7254 means that scripts can not react to user actions such as mouse movements or clicks, window
7255 resizing etc, anymore. Use with caution!
7258 We <emphasis>strongly discourage</emphasis> using this filter as a default since it breaks
7259 many legitimate scripts. It is meant for use only on extra-nasty sites (should you really
7266 <term><emphasis>html-annoyances</emphasis></term>
7269 This filter will undo many common instances of HTML based abuse.
7272 The <literal>BLINK</literal> and <literal>MARQUEE</literal> tags
7273 are neutralized (yeah baby!), and browser windows will be created as
7274 resizeable (as of course they should be!), and will have location,
7275 scroll and menu bars -- even if specified otherwise.
7281 <term><emphasis>content-cookies</emphasis></term>
7284 Most cookies are set in the HTTP dialog, where they can be intercepted
7286 <literal><link linkend="crunch-incoming-cookies">crunch-incoming-cookies</link></literal>
7287 and <literal><link linkend="crunch-outgoing-cookies">crunch-outgoing-cookies</link></literal>
7288 actions. But web sites increasingly make use of HTML meta tags and JavaScript
7289 to sneak cookies to the browser on the content level.
7292 This filter disables most HTML and JavaScript code that reads or sets
7293 cookies. It cannot detect all clever uses of these types of code, so it
7294 should not be relied on as an absolute fix. Use it wherever you would also
7295 use the cookie crunch actions.
7301 <term><emphasis>refresh tags</emphasis></term>
7304 Disable any refresh tags if the interval is greater than nine seconds (so
7305 that redirections done via refresh tags are not destroyed). This is useful
7306 for dial-on-demand setups, or for those who find this HTML feature
7313 <term><emphasis>unsolicited-popups</emphasis></term>
7316 This filter attempts to prevent only <quote>unsolicited</quote> pop-up
7317 windows from opening, yet still allow pop-up windows that the user
7318 has explicitly chosen to open. It was added in version 3.0.1,
7319 as an improvement over earlier such filters.
7322 Technical note: The filter works by redefining the window.open JavaScript
7323 function to a dummy function, <literal>PrivoxyWindowOpen()</literal>,
7324 during the loading and rendering phase of each HTML page access, and
7325 restoring the function afterward.
7328 This is recommended only for browsers that cannot perform this function
7329 reliably themselves. And be aware that some sites require such windows
7330 in order to function normally. Use with caution.
7336 <term><emphasis>all-popups</emphasis></term>
7339 Attempt to prevent <emphasis>all</emphasis> pop-up windows from opening.
7340 Note this should be used with even more discretion than the above, since
7341 it is more likely to break some sites that require pop-ups for normal
7342 usage. Use with caution.
7348 <term><emphasis>img-reorder</emphasis></term>
7351 This is a helper filter that has no value if used alone. It makes the
7352 <literal>banners-by-size</literal> and <literal>banners-by-link</literal>
7353 (see below) filters more effective and should be enabled together with them.
7359 <term><emphasis>banners-by-size</emphasis></term>
7362 This filter removes image tags purely based on what size they are. Fortunately
7363 for us, many ads and banner images tend to conform to certain standardized
7364 sizes, which makes this filter quite effective for ad stripping purposes.
7367 Occasionally this filter will cause false positives on images that are not ads,
7368 but just happen to be of one of the standard banner sizes.
7371 Recommended only for those who require extreme ad blocking. The default
7372 block rules should catch 95+% of all ads <emphasis>without</emphasis> this filter enabled.
7378 <term><emphasis>banners-by-link</emphasis></term>
7381 This is an experimental filter that attempts to kill any banners if
7382 their URLs seem to point to known or suspected click trackers. It is currently
7383 not of much value and is not recommended for use by default.
7389 <term><emphasis>webbugs</emphasis></term>
7392 Webbugs are small, invisible images (technically 1X1 GIF images), that
7393 are used to track users across websites, and collect information on them.
7394 As an HTML page is loaded by the browser, an embedded image tag causes the
7395 browser to contact a third-party site, disclosing the tracking information
7396 through the requested URL and/or cookies for that third-party domain, without
7397 the user ever becoming aware of the interaction with the third-party site.
7398 HTML-ized spam also uses a similar technique to verify email addresses.
7401 This filter removes the HTML code that loads such <quote>webbugs</quote>.
7407 <term><emphasis>tiny-textforms</emphasis></term>
7410 A rather special-purpose filter that can be used to enlarge textareas (those
7411 multi-line text boxes in web forms) and turn off hard word wrap in them.
7412 It was written for the sourceforge.net tracker system where such boxes are
7413 a nuisance, but it can be handy on other sites, too.
7416 It is not recommended to use this filter as a default.
7422 <term><emphasis>jumping-windows</emphasis></term>
7425 Many consider windows that move, or resize themselves to be abusive. This filter
7426 neutralizes the related JavaScript code. Note that some sites might not display
7427 or behave as intended when using this filter. Use with caution.
7433 <term><emphasis>frameset-borders</emphasis></term>
7436 Some web designers seem to assume that everyone in the world will view their
7437 web sites using the same browser brand and version, screen resolution etc,
7438 because only that assumption could explain why they'd use static frame sizes,
7439 yet prevent their frames from being resized by the user, should they be too
7440 small to show their whole content.
7443 This filter removes the related HTML code. It should only be applied to sites
7450 <term><emphasis>demoronizer</emphasis></term>
7453 Many Microsoft products that generate HTML use non-standard extensions (read:
7454 violations) of the ISO 8859-1 aka Latin-1 character set. This can cause those
7455 HTML documents to display with errors on standard-compliant platforms.
7458 This filter translates the MS-only characters into Latin-1 equivalents.
7459 It is not necessary when using MS products, and will cause corruption of
7460 all documents that use 8-bit character sets other than Latin-1. It's mostly
7461 worthwhile for Europeans on non-MS platforms, if weird garbage characters
7462 sometimes appear on some pages, or user agents that don't correct for this on
7465 My version of Mozilla (ancient) shows litte square boxes for quote
7466 characters, and apostrophes on moronized pages. So many pages have this, I
7467 can read them fine now. HB 08/27/06
7474 <term><emphasis>shockwave-flash</emphasis></term>
7477 A filter for shockwave haters. As the name suggests, this filter strips code
7478 out of web pages that is used to embed shockwave flash objects.
7486 <term><emphasis>quicktime-kioskmode</emphasis></term>
7489 Change HTML code that embeds Quicktime objects so that kioskmode, which
7490 prevents saving, is disabled.
7496 <term><emphasis>fun</emphasis></term>
7499 Text replacements for subversive browsing fun. Make fun of your favorite
7500 Monopolist or play buzzword bingo.
7506 <term><emphasis>crude-parental</emphasis></term>
7509 A demonstration-only filter that shows how <application>Privoxy</application>
7510 can be used to delete web content on a keyword basis.
7516 <term><emphasis>ie-exploits</emphasis></term>
7519 An experimental collection of text replacements to disable malicious HTML and JavaScript
7520 code that exploits known security holes in Internet Explorer.
7523 Presently, it only protects against Nimda and a cross-site scripting bug, and
7524 would need active maintenance to provide more substantial protection.
7530 <term><emphasis>site-specifics</emphasis></term>
7533 Some web sites have very specific problems, the cure for which doesn't apply
7534 anywhere else, or could even cause damage on other sites.
7537 This is a collection of such site-specific cures which should only be applied
7538 to the sites they were intended for, which is what the supplied
7539 <filename>default.action</filename> file does. Users shouldn't need to change
7540 anything regarding this filter.
7546 <term><emphasis>google</emphasis></term>
7549 A CSS based block for Google text ads. Also removes a width limitation
7550 and the toolbar advertisement.
7556 <term><emphasis>yahoo</emphasis></term>
7559 Another CSS based block, this time for Yahoo text ads. And removes
7560 a width limitation as well.
7566 <term><emphasis>msn</emphasis></term>
7569 Another CSS based block, this time for MSN text ads. And removes
7570 tracking URLs, as well as a width limitation.
7576 <term><emphasis>blogspot</emphasis></term>
7579 Cleans up some Blogspot blogs. Read the fine print before using this one!
7582 This filter also intentionally removes some navigation stuff and sets the
7583 page width to 100%. As a result, some rounded <quote>corners</quote> would
7584 appear to early or not at all and as fixing this would require a browser
7585 that understands background-size (CSS3), they are removed instead.
7591 <term><emphasis>xml-to-html</emphasis></term>
7594 Server-header filter to change the Content-Type from xml to html.
7600 <term><emphasis>html-to-xml</emphasis></term>
7603 Server-header filter to change the Content-Type from html to xml.
7609 <term><emphasis>no-ping</emphasis></term>
7612 Removes the non-standard <literal>ping</literal> attribute from
7613 anchor and area HTML tags.
7619 <term><emphasis>hide-tor-exit-notation</emphasis></term>
7622 Client-header filter to remove the <command>Tor</command> exit node notation
7623 found in Host and Referer headers.
7626 If &my-app; and <command>Tor</command> are chained and &my-app;
7627 is configured to use socks4a, one can use <quote>http://www.example.org.foobar.exit/</quote>
7628 to access the host <quote>www.example.org</quote> through the
7629 <command>Tor</command> exit node <quote>foobar</quote>.
7632 As the HTTP client isn't aware of this notation, it treats the
7633 whole string <quote>www.example.org.foobar.exit</quote> as host and uses it
7634 for the <quote>Host</quote> and <quote>Referer</quote> headers. From the
7635 server's point of view the resulting headers are invalid and can cause problems.
7638 An invalid <quote>Referer</quote> header can trigger <quote>hot-linking</quote>
7639 protections, an invalid <quote>Host</quote> header will make it impossible for
7640 the server to find the right vhost (several domains hosted on the same IP address).
7643 This client-header filter removes the <quote>foo.exit</quote> part in those headers
7644 to prevent the mentioned problems. Note that it only modifies
7645 the HTTP headers, it doesn't make it impossible for the server
7646 to detect your <command>Tor</command> exit node based on the IP address
7647 the request is coming from.
7654 <term><emphasis> </emphasis></term>
7668 <!-- ~ End section ~ -->
7672 <!-- ~~~~~ New section ~~~~~ -->
7674 <sect1 id="templates">
7675 <title>Privoxy's Template Files</title>
7677 All <application>Privoxy</application> built-in pages, i.e. error pages such as the
7678 <ulink url="http://show-the-404-error.page"><quote>404 - No Such Domain</quote>
7679 error page</ulink>, the <ulink
7680 url="http://ads.bannerserver.example.com/nasty-ads/sponsor.html"><quote>BLOCKED</quote>
7682 and all pages of its <ulink url="http://config.privoxy.org/">web-based
7683 user interface</ulink>, are generated from <emphasis>templates</emphasis>.
7684 (<application>Privoxy</application> must be running for the above links to work as
7689 These templates are stored in a subdirectory of the <link linkend="confdir">configuration
7690 directory</link> called <filename>templates</filename>. On Unixish platforms,
7692 <ulink url="file:///etc/privoxy/templates/"><filename>/etc/privoxy/templates/</filename></ulink>.
7696 The templates are basically normal HTML files, but with place-holders (called symbols
7697 or exports), which <application>Privoxy</application> fills at run time. You can
7698 edit the templates with a normal text editor, should you want to customize them.
7699 (<emphasis>Not recommended for the casual user</emphasis>). Note that
7700 just like in configuration files, lines starting with <literal>#</literal> are
7701 ignored when the templates are filled in.
7705 The place-holders are of the form <literal>@name@</literal>, and you will
7706 find a list of available symbols, which vary from template to template,
7707 in the comments at the start of each file. Note that these comments are not
7708 always accurate, and that it's probably best to look at the existing HTML
7709 code to find out which symbols are supported and what they are filled in with.
7713 A special application of this substitution mechanism is to make whole
7714 blocks of HTML code disappear when a specific symbol is set. We use this
7715 for many purposes, one of them being to include the beta warning in all
7716 our user interface (CGI) pages when <application>Privoxy</application>
7717 is in an alpha or beta development stage:
7722 <!-- @if-unstable-start -->
7724 ... beta warning HTML code goes here ...
7726 <!-- if-unstable-end@ --></screen>
7730 If the "unstable" symbol is set, everything in between and including
7731 <literal>@if-unstable-start</literal> and <literal>if-unstable-end@</literal>
7732 will disappear, leaving nothing but an empty comment:
7736 <screen><!-- --></screen>
7740 There's also an if-then-else construct and an <literal>#include</literal>
7741 mechanism, but you'll sure find out if you are inclined to edit the
7746 All templates refer to a style located at
7747 <ulink url="http://config.privoxy.org/send-stylesheet"><literal>http://config.privoxy.org/send-stylesheet</literal></ulink>.
7748 This is, of course, locally served by <application>Privoxy</application>
7749 and the source for it can be found and edited in the
7750 <filename>cgi-style.css</filename> template.
7755 <!-- ~ End section ~ -->
7759 <!-- ~~~~~ New section ~~~~~ -->
7761 <sect1 id="contact"><title>Contacting the Developers, Bug Reporting and Feature
7764 <!-- Include contacting.sgml boilerplate: -->
7766 <!-- end boilerplate -->
7770 <!-- ~ End section ~ -->
7773 <!-- ~~~~~ New section ~~~~~ -->
7774 <sect1 id="copyright"><title>Privoxy Copyright, License and History</title>
7776 <!-- Include copyright.sgml: -->
7778 <!-- end copyright -->
7780 <!-- ~~~~~ New section ~~~~~ -->
7781 <sect2><title>License</title>
7782 <!-- Include copyright.sgml: -->
7784 <!-- end copyright -->
7786 <!-- ~ End section ~ -->
7789 <!-- ~~~~~ New section ~~~~~ -->
7791 <sect2 id="history"><title>History</title>
7792 <!-- Include history.sgml: -->
7794 <!-- end history -->
7797 <sect2 id="authors"><title>Authors</title>
7798 <!-- Include p-authors.sgml: -->
7800 <!-- end authors -->
7805 <!-- ~ End section ~ -->
7808 <!-- ~~~~~ New section ~~~~~ -->
7809 <sect1 id="seealso"><title>See Also</title>
7810 <!-- Include seealso.sgml: -->
7812 <!-- end seealso -->
7817 <!-- ~~~~~ New section ~~~~~ -->
7818 <sect1 id="appendix"><title>Appendix</title>
7821 <!-- ~~~~~ New section ~~~~~ -->
7823 <title>Regular Expressions</title>
7825 <application>Privoxy</application> uses Perl-style <quote>regular
7826 expressions</quote> in its <link linkend="actions-file">actions
7827 files</link> and <link linkend="filter-file">filter file</link>,
7828 through the <ulink url="http://www.pcre.org/">PCRE</ulink> and
7831 <ulink url="http://www.oesterhelt.org/pcrs/">PCRS</ulink> libraries.
7833 <application>PCRS</application> libraries.
7837 If you are reading this, you probably don't understand what <quote>regular
7838 expressions</quote> are, or what they can do. So this will be a very brief
7839 introduction only. A full explanation would require a <ulink
7840 url="http://www.oreilly.com/catalog/regex/">book</ulink> ;-)
7844 Regular expressions provide a language to describe patterns that can be
7845 run against strings of characters (letter, numbers, etc), to see if they
7846 match the string or not. The patterns are themselves (sometimes complex)
7847 strings of literal characters, combined with wild-cards, and other special
7848 characters, called meta-characters. The <quote>meta-characters</quote> have
7849 special meanings and are used to build complex patterns to be matched against.
7850 Perl Compatible Regular Expressions are an especially convenient
7851 <quote>dialect</quote> of the regular expression language.
7855 To make a simple analogy, we do something similar when we use wild-card
7856 characters when listing files with the <command>dir</command> command in DOS.
7857 <literal>*.*</literal> matches all filenames. The <quote>special</quote>
7858 character here is the asterisk which matches any and all characters. We can be
7859 more specific and use <literal>?</literal> to match just individual
7860 characters. So <quote>dir file?.text</quote> would match
7861 <quote>file1.txt</quote>, <quote>file2.txt</quote>, etc. We are pattern
7862 matching, using a similar technique to <quote>regular expressions</quote>!
7866 Regular expressions do essentially the same thing, but are much, much more
7867 powerful. There are many more <quote>special characters</quote> and ways of
7868 building complex patterns however. Let's look at a few of the common ones,
7869 and then some examples:
7874 <emphasis>.</emphasis> - Matches any single character, e.g. <quote>a</quote>,
7875 <quote>A</quote>, <quote>4</quote>, <quote>:</quote>, or <quote>@</quote>.
7877 </simplelist></para>
7881 <emphasis>?</emphasis> - The preceding character or expression is matched ZERO or ONE
7884 </simplelist></para>
7888 <emphasis>+</emphasis> - The preceding character or expression is matched ONE or MORE
7891 </simplelist></para>
7895 <emphasis>*</emphasis> - The preceding character or expression is matched ZERO or MORE
7898 </simplelist></para>
7902 <emphasis>\</emphasis> - The <quote>escape</quote> character denotes that
7903 the following character should be taken literally. This is used where one of the
7904 special characters (e.g. <quote>.</quote>) needs to be taken literally and
7905 not as a special meta-character. Example: <quote>example\.com</quote>, makes
7906 sure the period is recognized only as a period (and not expanded to its
7907 meta-character meaning of any single character).
7909 </simplelist></para>
7913 <emphasis>[ ]</emphasis> - Characters enclosed in brackets will be matched if
7914 any of the enclosed characters are encountered. For instance, <quote>[0-9]</quote>
7915 matches any numeric digit (zero through nine). As an example, we can combine
7916 this with <quote>+</quote> to match any digit one of more times: <quote>[0-9]+</quote>.
7918 </simplelist></para>
7922 <emphasis>( )</emphasis> - parentheses are used to group a sub-expression,
7923 or multiple sub-expressions.
7925 </simplelist></para>
7929 <emphasis>|</emphasis> - The <quote>bar</quote> character works like an
7930 <quote>or</quote> conditional statement. A match is successful if the
7931 sub-expression on either side of <quote>|</quote> matches. As an example:
7932 <quote>/(this|that) example/</quote> uses grouping and the bar character
7933 and would match either <quote>this example</quote> or <quote>that
7934 example</quote>, and nothing else.
7936 </simplelist></para>
7939 These are just some of the ones you are likely to use when matching URLs with
7940 <application>Privoxy</application>, and is a long way from a definitive
7941 list. This is enough to get us started with a few simple examples which may
7942 be more illuminating:
7946 <emphasis><literal>/.*/banners/.*</literal></emphasis> - A simple example
7947 that uses the common combination of <quote>.</quote> and <quote>*</quote> to
7948 denote any character, zero or more times. In other words, any string at all.
7949 So we start with a literal forward slash, then our regular expression pattern
7950 (<quote>.*</quote>) another literal forward slash, the string
7951 <quote>banners</quote>, another forward slash, and lastly another
7952 <quote>.*</quote>. We are building
7953 a directory path here. This will match any file with the path that has a
7954 directory named <quote>banners</quote> in it. The <quote>.*</quote> matches
7955 any characters, and this could conceivably be more forward slashes, so it
7956 might expand into a much longer looking path. For example, this could match:
7957 <quote>/eye/hate/spammers/banners/annoy_me_please.gif</quote>, or just
7958 <quote>/banners/annoying.html</quote>, or almost an infinite number of other
7959 possible combinations, just so it has <quote>banners</quote> in the path
7964 And now something a little more complex:
7968 <emphasis><literal>/.*/adv((er)?ts?|ertis(ing|ements?))?/</literal></emphasis> -
7969 We have several literal forward slashes again (<quote>/</quote>), so we are
7970 building another expression that is a file path statement. We have another
7971 <quote>.*</quote>, so we are matching against any conceivable sub-path, just so
7972 it matches our expression. The only true literal that <emphasis>must
7973 match</emphasis> our pattern is <application>adv</application>, together with
7974 the forward slashes. What comes after the <quote>adv</quote> string is the
7979 Remember the <quote>?</quote> means the preceding expression (either a
7980 literal character or anything grouped with <quote>(...)</quote> in this case)
7981 can exist or not, since this means either zero or one match. So
7982 <quote>((er)?ts?|ertis(ing|ements?))</quote> is optional, as are the
7983 individual sub-expressions: <quote>(er)</quote>,
7984 <quote>(ing|ements?)</quote>, and the <quote>s</quote>. The <quote>|</quote>
7985 means <quote>or</quote>. We have two of those. For instance,
7986 <quote>(ing|ements?)</quote>, can expand to match either <quote>ing</quote>
7987 <emphasis>OR</emphasis> <quote>ements?</quote>. What is being done here, is an
7988 attempt at matching as many variations of <quote>advertisement</quote>, and
7989 similar, as possible. So this would expand to match just <quote>adv</quote>,
7990 or <quote>advert</quote>, or <quote>adverts</quote>, or
7991 <quote>advertising</quote>, or <quote>advertisement</quote>, or
7992 <quote>advertisements</quote>. You get the idea. But it would not match
7993 <quote>advertizements</quote> (with a <quote>z</quote>). We could fix that by
7994 changing our regular expression to:
7995 <quote>/.*/adv((er)?ts?|erti(s|z)(ing|ements?))?/</quote>, which would then match
8000 <emphasis><literal>/.*/advert[0-9]+\.(gif|jpe?g)</literal></emphasis> - Again
8001 another path statement with forward slashes. Anything in the square brackets
8002 <quote>[ ]</quote> can be matched. This is using <quote>0-9</quote> as a
8003 shorthand expression to mean any digit one through nine. It is the same as
8004 saying <quote>0123456789</quote>. So any digit matches. The <quote>+</quote>
8005 means one or more of the preceding expression must be included. The preceding
8006 expression here is what is in the square brackets -- in this case, any digit
8007 one through nine. Then, at the end, we have a grouping: <quote>(gif|jpe?g)</quote>.
8008 This includes a <quote>|</quote>, so this needs to match the expression on
8009 either side of that bar character also. A simple <quote>gif</quote> on one side, and the other
8010 side will in turn match either <quote>jpeg</quote> or <quote>jpg</quote>,
8011 since the <quote>?</quote> means the letter <quote>e</quote> is optional and
8012 can be matched once or not at all. So we are building an expression here to
8013 match image GIF or JPEG type image file. It must include the literal
8014 string <quote>advert</quote>, then one or more digits, and a <quote>.</quote>
8015 (which is now a literal, and not a special character, since it is escaped
8016 with <quote>\</quote>), and lastly either <quote>gif</quote>, or
8017 <quote>jpeg</quote>, or <quote>jpg</quote>. Some possible matches would
8018 include: <quote>//advert1.jpg</quote>,
8019 <quote>/nasty/ads/advert1234.gif</quote>,
8020 <quote>/banners/from/hell/advert99.jpg</quote>. It would not match
8021 <quote>advert1.gif</quote> (no leading slash), or
8022 <quote>/adverts232.jpg</quote> (the expression does not include an
8023 <quote>s</quote>), or <quote>/advert1.jsp</quote> (<quote>jsp</quote> is not
8024 in the expression anywhere).
8028 We are barely scratching the surface of regular expressions here so that you
8029 can understand the default <application>Privoxy</application>
8030 configuration files, and maybe use this knowledge to customize your own
8031 installation. There is much, much more that can be done with regular
8032 expressions. Now that you know enough to get started, you can learn more on
8037 More reading on Perl Compatible Regular expressions:
8038 <ulink url="http://perldoc.perl.org/perlre.html">http://perldoc.perl.org/perlre.html</ulink>
8042 For information on regular expression based substitutions and their applications
8043 in filters, please see the <link linkend="filter-file">filter file tutorial</link>
8048 <!-- ~ End section ~ -->
8051 <!-- ~~~~~ New section ~~~~~ -->
8053 <title>Privoxy's Internal Pages</title>
8056 Since <application>Privoxy</application> proxies each requested
8057 web page, it is easy for <application>Privoxy</application> to
8058 trap certain special URLs. In this way, we can talk directly to
8059 <application>Privoxy</application>, and see how it is
8060 configured, see how our rules are being applied, change these
8061 rules and other configuration options, and even turn
8062 <application>Privoxy's</application> filtering off, all with
8068 The URLs listed below are the special ones that allow direct access
8069 to <application>Privoxy</application>. Of course,
8070 <application>Privoxy</application> must be running to access these. If
8071 not, you will get a friendly error message. Internet access is not
8084 <ulink url="http://config.privoxy.org/">http://config.privoxy.org/</ulink>
8088 There is a shortcut: <ulink url="http://p.p/">http://p.p/</ulink> (But it
8089 doesn't provide a fall-back to a real page, in case the request is not
8090 sent through <application>Privoxy</application>)
8096 Show information about the current configuration, including viewing and
8097 editing of actions files:
8101 <ulink url="http://config.privoxy.org/show-status">http://config.privoxy.org/show-status</ulink>
8108 Show the source code version numbers:
8112 <ulink url="http://config.privoxy.org/show-version">http://config.privoxy.org/show-version</ulink>
8119 Show the browser's request headers:
8123 <ulink url="http://config.privoxy.org/show-request">http://config.privoxy.org/show-request</ulink>
8130 Show which actions apply to a URL and why:
8134 <ulink url="http://config.privoxy.org/show-url-info">http://config.privoxy.org/show-url-info</ulink>
8141 Toggle Privoxy on or off. In this case, <quote>Privoxy</quote> continues
8142 to run, but only as a pass-through proxy, with no actions taking place:
8146 <ulink url="http://config.privoxy.org/toggle">http://config.privoxy.org/toggle</ulink>
8150 Short cuts. Turn off, then on:
8154 <ulink url="http://config.privoxy.org/toggle?set=disable">http://config.privoxy.org/toggle?set=disable</ulink>
8159 <ulink url="http://config.privoxy.org/toggle?set=enable">http://config.privoxy.org/toggle?set=enable</ulink>
8168 These may be bookmarked for quick reference. See next.
8172 <sect3 id="bookmarklets">
8173 <title>Bookmarklets</title>
8175 Below are some <quote>bookmarklets</quote> to allow you to easily access a
8176 <quote>mini</quote> version of some of <application>Privoxy's</application>
8177 special pages. They are designed for MS Internet Explorer, but should work
8178 equally well in Netscape, Mozilla, and other browsers which support
8179 JavaScript. They are designed to run directly from your bookmarks - not by
8180 clicking the links below (although that should work for testing).
8183 To save them, right-click the link and choose <quote>Add to Favorites</quote>
8184 (IE) or <quote>Add Bookmark</quote> (Netscape). You will get a warning that
8185 the bookmark <quote>may not be safe</quote> - just click OK. Then you can run the
8186 Bookmarklet directly from your favorites/bookmarks. For even faster access,
8187 you can put them on the <quote>Links</quote> bar (IE) or the <quote>Personal
8188 Toolbar</quote> (Netscape), and run them with a single click.
8197 url="javascript:void(window.open('http://config.privoxy.org/toggle?mini=y&set=enabled','ijbstatus','width=250,height=100,resizable=yes,scrollbars=no,toolbar=no,location=no,directories=no,status=no,menubar=no,copyhistory=no').focus());">Privoxy - Enable</ulink>
8204 url="javascript:void(window.open('http://config.privoxy.org/toggle?mini=y&set=disabled','ijbstatus','width=250,height=100,resizable=yes,scrollbars=no,toolbar=no,location=no,directories=no,status=no,menubar=no,copyhistory=no').focus());">Privoxy - Disable</ulink>
8211 url="javascript:void(window.open('http://config.privoxy.org/toggle?mini=y&set=toggle','ijbstatus','width=250,height=100,resizable=yes,scrollbars=no,toolbar=no,location=no,directories=no,status=no,menubar=no,copyhistory=no').focus());">Privoxy - Toggle Privoxy</ulink> (Toggles between enabled and disabled)
8218 url="javascript:void(window.open('http://config.privoxy.org/toggle?mini=y','ijbstatus','width=250,height=2,resizable=yes,scrollbars=no,toolbar=no,location=no,directories=no,status=no,menubar=no,copyhistory=no').focus());">Privoxy- View Status</ulink>
8224 <ulink url="javascript:w=Math.floor(screen.width/2);h=Math.floor(screen.height*0.9);void(window.open('http://www.privoxy.org/actions/index.php?url='+escape(location.href),'Feedback','screenx='+w+',width='+w+',height='+h+',scrollbars=yes,toolbar=no,location=no,directories=no,status=no,menubar=no,copyhistory=no').focus());">Privoxy - Submit Actions File Feedback</ulink>
8230 <ulink url="javascript:void(window.open('http://config.privoxy.org/show-url-info?url='+escape(location.href),'Why').focus());">Privoxy - Why?</ulink>
8237 Credit: The site which gave us the general idea for these bookmarklets is
8238 <ulink url="http://www.bookmarklets.com/">www.bookmarklets.com</ulink>. They
8239 have more information about bookmarklets.
8248 <!-- ~~~~~ New section ~~~~~ -->
8250 <title>Chain of Events</title>
8252 Let's take a quick look at how some of <application>Privoxy's</application>
8253 core features are triggered, and the ensuing sequence of events when a web
8254 page is requested by your browser:
8261 First, your web browser requests a web page. The browser knows to send
8262 the request to <application>Privoxy</application>, which will in turn,
8263 relay the request to the remote web server after passing the following
8269 <application>Privoxy</application> traps any request for its own internal CGI
8270 pages (e.g <ulink url="http://p.p/">http://p.p/</ulink>) and sends the CGI page back to the browser.
8275 Next, <application>Privoxy</application> checks to see if the URL
8277 linkend="BLOCK"><quote>+block</quote></link> patterns. If
8278 so, the URL is then blocked, and the remote web server will not be contacted.
8279 <link linkend="HANDLE-AS-IMAGE"><quote>+handle-as-image</quote></link>
8281 <link linkend="HANDLE-AS-EMPTY-DOCUMENT"><quote>+handle-as-empty-document</quote></link>
8282 are then checked, and if there is no match, an
8283 HTML <quote>BLOCKED</quote> page is sent back to the browser. Otherwise, if
8284 it does match, an image is returned for the former, and an empty text
8285 document for the latter. The type of image would depend on the setting of
8286 <link linkend="SET-IMAGE-BLOCKER"><quote>+set-image-blocker</quote></link>
8287 (blank, checkerboard pattern, or an HTTP redirect to an image elsewhere).
8292 Untrusted URLs are blocked. If URLs are being added to the
8293 <filename>trust</filename> file, then that is done.
8298 If the URL pattern matches the <link
8299 linkend="FAST-REDIRECTS"><quote>+fast-redirects</quote></link> action,
8300 it is then processed. Unwanted parts of the requested URL are stripped.
8305 Now the rest of the client browser's request headers are processed. If any
8306 of these match any of the relevant actions (e.g. <link
8307 linkend="HIDE-USER-AGENT"><quote>+hide-user-agent</quote></link>,
8308 etc.), headers are suppressed or forged as determined by these actions and
8314 Now the web server starts sending its response back (i.e. typically a web
8320 First, the server headers are read and processed to determine, among other
8321 things, the MIME type (document type) and encoding. The headers are then
8322 filtered as determined by the
8323 <link linkend="CRUNCH-INCOMING-COOKIES"><quote>+crunch-incoming-cookies</quote></link>,
8324 <link linkend="SESSION-COOKIES-ONLY"><quote>+session-cookies-only</quote></link>,
8325 and <link linkend="DOWNGRADE-HTTP-VERSION"><quote>+downgrade-http-version</quote></link>
8331 If the <link linkend="KILL-POPUPS"><quote>+kill-popups</quote></link>
8332 action applies, and it is an HTML or JavaScript document, the popup-code in the
8333 response is filtered on-the-fly as it is received.
8338 If any <link linkend="FILTER"><quote>+filter</quote></link> action
8340 linkend="DEANIMATE-GIFS"><quote>+deanimate-gifs</quote></link>
8341 action applies (and the document type fits the action), the rest of the page is
8342 read into memory (up to a configurable limit). Then the filter rules (from
8343 <filename>default.filter</filename> and any other filter files) are
8344 processed against the buffered content. Filters are applied in the order
8345 they are specified in one of the filter files. Animated GIFs, if present,
8346 are reduced to either the first or last frame, depending on the action
8347 setting.The entire page, which is now filtered, is then sent by
8348 <application>Privoxy</application> back to your browser.
8351 If neither a <link linkend="FILTER"><quote>+filter</quote></link> action
8353 linkend="DEANIMATE-GIFS"><quote>+deanimate-gifs</quote></link>
8354 matches, then <application>Privoxy</application> passes the raw data through
8355 to the client browser as it becomes available.
8360 As the browser receives the now (possibly filtered) page content, it
8361 reads and then requests any URLs that may be embedded within the page
8362 source, e.g. ad images, stylesheets, JavaScript, other HTML documents (e.g.
8363 frames), sounds, etc. For each of these objects, the browser issues a
8364 separate request (this is easily viewable in <application>Privoxy's</application>
8365 logs). And each such request is in turn processed just as above. Note that a
8366 complex web page will have many, many such embedded URLs. If these
8367 secondary requests are to a different server, then quite possibly a very
8368 differing set of actions is triggered.
8375 NOTE: This is somewhat of a simplistic overview of what happens with each URL
8376 request. For the sake of brevity and simplicity, we have focused on
8377 <application>Privoxy's</application> core features only.
8383 <!-- ~~~~~ New section ~~~~~ -->
8384 <sect2 id="actionsanat">
8385 <title>Troubleshooting: Anatomy of an Action</title>
8388 The way <application>Privoxy</application> applies
8389 <link linkend="ACTIONS">actions</link> and <link linkend="FILTER">filters</link>
8390 to any given URL can be complex, and not always so
8391 easy to understand what is happening. And sometimes we need to be able to
8392 <emphasis>see</emphasis> just what <application>Privoxy</application> is
8393 doing. Especially, if something <application>Privoxy</application> is doing
8394 is causing us a problem inadvertently. It can be a little daunting to look at
8395 the actions and filters files themselves, since they tend to be filled with
8396 <link linkend="regex">regular expressions</link> whose consequences are not
8401 One quick test to see if <application>Privoxy</application> is causing a problem
8402 or not, is to disable it temporarily. This should be the first troubleshooting
8403 step. See <link linkend="bookmarklets">the Bookmarklets</link> section on a quick
8404 and easy way to do this (be sure to flush caches afterward!). Looking at the
8405 logs is a good idea too.
8408 Another easy troubleshooting step to try is if you have done any
8409 customization of your installation, revert back to the installed
8410 defaults and see if that helps. There are times the developers get complaints
8411 about one thing or another, and the problem is more related to a customized
8412 configuration issue.
8416 <application>Privoxy</application> also provides the
8417 <ulink url="http://config.privoxy.org/show-url-info">http://config.privoxy.org/show-url-info</ulink>
8418 page that can show us very specifically how <application>actions</application>
8419 are being applied to any given URL. This is a big help for troubleshooting.
8423 First, enter one URL (or partial URL) at the prompt, and then
8424 <application>Privoxy</application> will tell us
8425 how the current configuration will handle it. This will not
8426 help with filtering effects (i.e. the <link
8427 linkend="FILTER"><quote>+filter</quote></link> action) from
8428 one of the filter files since this is handled very
8429 differently and not so easy to trap! It also will not tell you about any other
8430 URLs that may be embedded within the URL you are testing. For instance, images
8431 such as ads are expressed as URLs within the raw page source of HTML pages. So
8432 you will only get info for the actual URL that is pasted into the prompt area
8433 -- not any sub-URLs. If you want to know about embedded URLs like ads, you
8434 will have to dig those out of the HTML source. Use your browser's <quote>View
8435 Page Source</quote> option for this. Or right click on the ad, and grab the
8440 Let's try an example, <ulink url="http://google.com">google.com</ulink>,
8441 and look at it one section at a time in a sample configuration (your real
8442 configuration may vary):
8447 Matches for http://google.com:
8449 In file: default.action <guibutton>[ View ]</guibutton> <guibutton>[ Edit ]</guibutton>
8453 -client-header-filter{hide-tor-exit-notation}
8454 -content-type-overwrite
8455 -crunch-client-header
8456 -crunch-if-none-match
8457 -crunch-incoming-cookies
8458 -crunch-outgoing-cookies
8459 -crunch-server-header
8460 +deanimate-gifs {last}
8461 -downgrade-http-version
8462 +fast-redirects {check-decoded-url}
8464 -filter {content-cookies}
8465 -filter {all-popups}
8466 -filter {banners-by-link}
8467 -filter {tiny-textforms}
8468 -filter {frameset-borders}
8469 -filter {demoronizer}
8470 -filter {shockwave-flash}
8471 -filter {quicktime-kioskmode}
8473 -filter {crude-parental}
8474 -filter {site-specifics}
8475 -filter {js-annoyances}
8476 -filter {html-annoyances}
8477 +filter {refresh-tags}
8478 -filter {unsolicited-popups}
8479 +filter {img-reorder}
8480 +filter {banners-by-size}
8482 +filter {jumping-windows}
8483 +filter {ie-exploits}
8490 -handle-as-empty-document
8492 -hide-accept-language
8493 -hide-content-disposition
8494 +hide-forwarded-for-headers
8495 +hide-from-header {block}
8496 -hide-if-modified-since
8497 +hide-referrer {forge}
8502 -overwrite-last-modified
8503 +prevent-compression
8507 -server-header-filter{xml-to-html}
8508 -server-header-filter{html-to-xml}
8509 +session-cookies-only
8510 +set-image-blocker {pattern}
8511 -treat-forbidden-connects-like-blocks }
8514 { -session-cookies-only }
8520 In file: user.action <guibutton>[ View ]</guibutton> <guibutton>[ Edit ]</guibutton>
8521 (no matches in this file)
8526 This is telling us how we have defined our
8527 <link linkend="ACTIONS"><quote>actions</quote></link>, and
8528 which ones match for our test case, <quote>google.com</quote>.
8529 Displayed is all the actions that are available to us. Remember,
8530 the <literal>+</literal> sign denotes <quote>on</quote>. <literal>-</literal>
8531 denotes <quote>off</quote>. So some are <quote>on</quote> here, but many
8532 are <quote>off</quote>. Each example we try may provide a slightly different
8533 end result, depending on our configuration directives.
8537 is for our <filename>default.action</filename> file. The large, multi-line
8538 listing, is how the actions are set to match for all URLs, i.e. our default
8539 settings. If you look at your <quote>actions</quote> file, this would be the
8540 section just below the <quote>aliases</quote> section near the top. This
8541 will apply to all URLs as signified by the single forward slash at the end
8542 of the listing -- <quote> / </quote>.
8546 But we have defined additional actions that would be exceptions to these general
8547 rules, and then we list specific URLs (or patterns) that these exceptions
8548 would apply to. Last match wins. Just below this then are two explicit
8549 matches for <quote>.google.com</quote>. The first is negating our previous
8550 cookie setting, which was for <link
8551 linkend="SESSION-COOKIES-ONLY"><quote>+session-cookies-only</quote></link>
8552 (i.e. not persistent). So we will allow persistent cookies for google, at
8553 least that is how it is in this example. The second turns
8554 <emphasis>off</emphasis> any <link
8555 linkend="FAST-REDIRECTS"><quote>+fast-redirects</quote></link>
8556 action, allowing this to take place unmolested. Note that there is a leading
8557 dot here -- <quote>.google.com</quote>. This will match any hosts and
8558 sub-domains, in the google.com domain also, such as
8559 <quote>www.google.com</quote> or <quote>mail.google.com</quote>. But it would not
8560 match <quote>www.google.de</quote>! So, apparently, we have these two actions
8561 defined as exceptions to the general rules at the top somewhere in the lower
8562 part of our <filename>default.action</filename> file, and
8563 <quote>google.com</quote> is referenced somewhere in these latter sections.
8567 Then, for our <filename>user.action</filename> file, we again have no hits.
8568 So there is nothing google-specific that we might have added to our own, local
8569 configuration. If there was, those actions would over-rule any actions from
8570 previously processed files, such as <filename>default.action</filename>.
8571 <filename>user.action</filename> typically has the last word. This is the
8572 best place to put hard and fast exceptions,
8576 And finally we pull it all together in the bottom section and summarize how
8577 <application>Privoxy</application> is applying all its <quote>actions</quote>
8578 to <quote>google.com</quote>:
8589 -client-header-filter{hide-tor-exit-notation}
8590 -content-type-overwrite
8591 -crunch-client-header
8592 -crunch-if-none-match
8593 -crunch-incoming-cookies
8594 -crunch-outgoing-cookies
8595 -crunch-server-header
8596 +deanimate-gifs {last}
8597 -downgrade-http-version
8598 +fast-redirects {check-decoded-url}
8600 -filter {content-cookies}
8601 -filter {all-popups}
8602 -filter {banners-by-link}
8603 -filter {tiny-textforms}
8604 -filter {frameset-borders}
8605 -filter {demoronizer}
8606 -filter {shockwave-flash}
8607 -filter {quicktime-kioskmode}
8609 -filter {crude-parental}
8610 -filter {site-specifics}
8611 -filter {js-annoyances}
8612 -filter {html-annoyances}
8613 +filter {refresh-tags}
8614 -filter {unsolicited-popups}
8615 +filter {img-reorder}
8616 +filter {banners-by-size}
8618 +filter {jumping-windows}
8619 +filter {ie-exploits}
8626 -handle-as-empty-document
8628 -hide-accept-language
8629 -hide-content-disposition
8630 +hide-forwarded-for-headers
8631 +hide-from-header {block}
8632 -hide-if-modified-since
8633 +hide-referrer {forge}
8638 -overwrite-last-modified
8639 +prevent-compression
8643 -server-header-filter{xml-to-html}
8644 -server-header-filter{html-to-xml}
8645 -session-cookies-only
8646 +set-image-blocker {pattern}
8647 -treat-forbidden-connects-like-blocks </screen>
8651 Notice the only difference here to the previous listing, is to
8652 <quote>fast-redirects</quote> and <quote>session-cookies-only</quote>,
8653 which are activated specifically for this site in our configuration,
8654 and thus show in the <quote>Final Results</quote>.
8658 Now another example, <quote>ad.doubleclick.net</quote>:
8670 { +block +handle-as-image }
8671 .[a-vx-z]*.doubleclick.net
8676 We'll just show the interesting part here - the explicit matches. It is
8677 matched three different times. Two <quote>+block</quote> sections,
8678 and a <quote>+block +handle-as-image</quote>,
8679 which is the expanded form of one of our aliases that had been defined as:
8680 <quote>+block-as-image</quote>. (<link
8681 linkend="ALIASES"><quote>Aliases</quote></link> are defined in
8682 the first section of the actions file and typically used to combine more
8687 Any one of these would have done the trick and blocked this as an unwanted
8688 image. This is unnecessarily redundant since the last case effectively
8689 would also cover the first. No point in taking chances with these guys
8690 though ;-) Note that if you want an ad or obnoxious
8691 URL to be invisible, it should be defined as <quote>ad.doubleclick.net</quote>
8692 is done here -- as both a <link
8693 linkend="BLOCK"><quote>+block</quote></link>
8694 <emphasis>and</emphasis> an
8695 <link linkend="HANDLE-AS-IMAGE"><quote>+handle-as-image</quote></link>.
8696 The custom alias <quote><literal>+block-as-image</literal></quote> just
8697 simplifies the process and make it more readable.
8701 One last example. Let's try <quote>http://www.example.net/adsl/HOWTO/</quote>.
8702 This one is giving us problems. We are getting a blank page. Hmmm ...
8708 Matches for http://www.example.net/adsl/HOWTO/:
8710 In file: default.action <guibutton>[ View ]</guibutton> <guibutton>[ Edit ]</guibutton>
8714 -client-header-filter{hide-tor-exit-notation}
8715 -content-type-overwrite
8716 -crunch-client-header
8717 -crunch-if-none-match
8718 -crunch-incoming-cookies
8719 -crunch-outgoing-cookies
8720 -crunch-server-header
8722 -downgrade-http-version
8723 +fast-redirects {check-decoded-url}
8725 -filter {content-cookies}
8726 -filter {all-popups}
8727 -filter {banners-by-link}
8728 -filter {tiny-textforms}
8729 -filter {frameset-borders}
8730 -filter {demoronizer}
8731 -filter {shockwave-flash}
8732 -filter {quicktime-kioskmode}
8734 -filter {crude-parental}
8735 -filter {site-specifics}
8736 -filter {js-annoyances}
8737 -filter {html-annoyances}
8738 +filter {refresh-tags}
8739 -filter {unsolicited-popups}
8740 +filter {img-reorder}
8741 +filter {banners-by-size}
8743 +filter {jumping-windows}
8744 +filter {ie-exploits}
8751 -handle-as-empty-document
8753 -hide-accept-language
8754 -hide-content-disposition
8755 +hide-forwarded-for-headers
8756 +hide-from-header{block}
8757 +hide-referer{forge}
8761 -overwrite-last-modified
8762 +prevent-compression
8766 -server-header-filter{xml-to-html}
8767 -server-header-filter{html-to-xml}
8768 +session-cookies-only
8769 +set-image-blocker{blank}
8770 -treat-forbidden-connects-like-blocks }
8773 { +block +handle-as-image }
8779 Ooops, the <quote>/adsl/</quote> is matching <quote>/ads</quote> in our
8780 configuration! But we did not want this at all! Now we see why we get the
8781 blank page. It is actually triggering two different actions here, and
8782 the effects are aggregated so that the URL is blocked, and &my-app; is told
8783 to treat the block as if it were an image. But this is, of course, all wrong.
8784 We could now add a new action below this (or better in our own
8785 <filename>user.action</filename> file) that explicitly
8786 <emphasis>un</emphasis> blocks (
8787 <link linkend="BLOCK"><quote>{-block}</quote></link>) paths with
8788 <quote>adsl</quote> in them (remember, last match in the configuration
8789 wins). There are various ways to handle such exceptions. Example:
8801 Now the page displays ;-)
8802 Remember to flush your browser's caches when making these kinds of changes to
8803 your configuration to insure that you get a freshly delivered page! Or, try
8804 using <literal>Shift+Reload</literal>.
8808 But now what about a situation where we get no explicit matches like
8815 { +block +handle-as-image }
8821 That actually was very helpful and pointed us quickly to where the problem
8822 was. If you don't get this kind of match, then it means one of the default
8823 rules in the first section of <filename>default.action</filename> is causing
8824 the problem. This would require some guesswork, and maybe a little trial and
8825 error to isolate the offending rule. One likely cause would be one of the
8826 <link linkend="FILTER"><quote>+filter</quote></link> actions.
8827 These tend to be harder to troubleshoot.
8828 Try adding the URL for the site to one of aliases that turn off
8829 <link linkend="FILTER"><quote>+filter</quote></link>:
8837 .worldpay.com # for quietpc.com
8845 <quote><literal>{ shop }</literal></quote> is an <quote>alias</quote> that expands to
8846 <quote><literal>{ -filter -session-cookies-only }</literal></quote>.
8847 Or you could do your own exception to negate filtering:
8855 # Disable ALL filter actions for sites in this section
8863 This would turn off all filtering for these sites. This is best
8864 put in <filename>user.action</filename>, for local site
8865 exceptions. Note that when a simple domain pattern is used by itself (without
8866 the subsequent path portion), all sub-pages within that domain are included
8867 automatically in the scope of the action.
8871 Images that are inexplicably being blocked, may well be hitting the
8872 <link linkend="FILTER-BANNERS-BY-SIZE"><quote>+filter{banners-by-size}</quote></link>
8874 that images of certain sizes are ad banners (works well
8875 <emphasis>most of the time</emphasis> since these tend to be standardized).
8879 <quote><literal>{ fragile }</literal></quote> is an alias that disables most
8880 actions that are the most likely to cause trouble. This can be used as a
8881 last resort for problem sites.
8887 # Handle with care: easy to break
8889 mybank.example.com</screen>
8894 <emphasis>Remember to flush caches!</emphasis> Note that the
8895 <literal>mail.google</literal> reference lacks the TLD portion (e.g.
8896 <quote>.com</quote>. This will effectively match any TLD with
8897 <literal>google</literal> in it, such as <literal>mail.google.de</literal>,
8901 If this still does not work, you will have to go through the remaining
8902 actions one by one to find which one(s) is causing the problem.
8911 This program is free software; you can redistribute it
8912 and/or modify it under the terms of the GNU General
8913 Public License as published by the Free Software
8914 Foundation; either version 2 of the License, or (at
8915 your option) any later version.
8917 This program is distributed in the hope that it will
8918 be useful, but WITHOUT ANY WARRANTY; without even the
8919 implied warranty of MERCHANTABILITY or FITNESS FOR A
8920 PARTICULAR PURPOSE. See the GNU General Public
8921 License for more details.
8923 The GNU General Public License should be included with
8924 this file. If not, you can view it at
8925 http://www.gnu.org/copyleft/gpl.html
8926 or write to the Free Software Foundation, Inc.,
8927 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
8930 $Log: user-manual.sgml,v $
8931 Revision 2.31 2007/06/02 14:01:37 fabiankeil
8932 Start to document forward-override{}.
8934 Revision 2.30 2007/04/25 15:10:36 fabiankeil
8935 - Describe installation for FreeBSD.
8936 - Start to document taggers and tag patterns.
8937 - Don't confuse devils and daemons.
8939 Revision 2.29 2007/04/05 11:47:51 fabiankeil
8940 Some updates regarding header filtering,
8941 handling of compressed content and redirect's
8942 support for pcrs commands.
8944 Revision 2.28 2006/12/10 23:42:48 hal9
8945 Fix various typos reported by Adam P. Thanks.
8947 Revision 2.27 2006/11/14 01:57:47 hal9
8948 Dump all docs prior to 3.0.6 release. Various minor changes to faq and user
8951 Revision 2.26 2006/10/24 11:16:44 hal9
8954 Revision 2.25 2006/10/18 10:50:33 hal9
8955 Add note that since filters are off in Cautious, compression is ON. Turn off
8956 compression to make filters work on all sites.
8958 Revision 2.24 2006/10/03 11:13:54 hal9
8959 More references to the new filters. Include html this time around.
8961 Revision 2.23 2006/10/02 22:43:53 hal9
8962 Contains new filter definitions from Fabian, and few other miscellaneous
8965 Revision 2.22 2006/09/22 01:27:55 hal9
8966 Final commit of probably various minor changes here and there. Unless
8967 something changes this should be ready for pending release.
8969 Revision 2.21 2006/09/20 03:21:36 david__schmidt
8970 Just the tiniest tweak. Wafer thin!
8972 Revision 2.20 2006/09/10 14:53:54 hal9
8973 Results of spell check. User manual has some updates to standard.actions file
8976 Revision 2.19 2006/09/08 12:19:02 fabiankeil
8977 Adjust hide-if-modified-since example values
8978 to reflect the recent changes.
8980 Revision 2.18 2006/09/08 02:38:57 hal9
8982 -Fix a number of broken links.
8983 -Migrate the new Windows service command line options, and reference as
8985 -Rebuild so that can be used with the new "user-manual" config capabilities.
8988 Revision 2.17 2006/09/05 13:25:12 david__schmidt
8989 Add Windows service invocation stuff (duplicated) in FAQ and in user manual under Windows startup. One probably ought to reference the other.
8991 Revision 2.16 2006/09/02 12:49:37 hal9
8992 Various small updates for new actions, filterfiles, etc.
8994 Revision 2.15 2006/08/30 11:15:22 hal9
8995 More work on the new actions, especially filter-*-headers, and What's New
8996 section. User Manual is close to final form for 3.0.4 release. Some tinkering
8997 and proof reading left to do.
8999 Revision 2.14 2006/08/29 10:59:36 hal9
9000 Add a "Whats New in this release" Section. Further work on multiple filter
9001 files, and assorted other minor changes.
9003 Revision 2.13 2006/08/22 11:04:59 hal9
9004 Silence warnings and errors. This should build now. New filters were only
9005 stubbed in. More to be done.
9007 Revision 2.12 2006/08/14 08:40:39 fabiankeil
9008 Documented new actions that were part of
9009 the "minor Privoxy improvements".
9011 Revision 2.11 2006/07/18 14:48:51 david__schmidt
9012 Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
9013 with what was really the latest development (the v_3_0_branch branch)
9015 Revision 1.123.2.43 2005/05/23 09:59:10 hal9
9018 Revision 1.123.2.42 2004/12/04 14:39:57 hal9
9019 Fix two minor typos per bug SF report.
9021 Revision 1.123.2.41 2004/03/23 12:58:42 oes
9024 Revision 1.123.2.40 2004/02/27 12:48:49 hal9
9025 Add comment re: redirecting to local file system for set-image-blocker may
9026 is dependent on browser.
9028 Revision 1.123.2.39 2004/01/30 22:31:40 oes
9029 Added a hint re bookmarklets to Quickstart section
9031 Revision 1.123.2.38 2004/01/30 16:47:51 oes
9032 Some minor clarifications
9034 Revision 1.123.2.37 2004/01/29 22:36:11 hal9
9035 Updates for no longer filtering text/plain, and demoronizer default settings,
9036 and copyright notice dates.
9038 Revision 1.123.2.36 2003/12/10 02:26:26 hal9
9039 Changed the demoronizer filter description.
9041 Revision 1.123.2.35 2003/11/06 13:36:37 oes
9042 Updated link to nightly CVS tarball
9044 Revision 1.123.2.34 2003/06/26 23:50:16 hal9
9045 Add a small bit on filtering and problems re: source code being corrupted.
9047 Revision 1.123.2.33 2003/05/08 18:17:33 roro
9048 Use apt-get instead of dpkg to install Debian package, which is more
9049 solid, uses the correct and most recent Debian version automatically.
9051 Revision 1.123.2.32 2003/04/11 03:13:57 hal9
9052 Add small note about only one filterfile (as opposed to multiple actions
9055 Revision 1.123.2.31 2003/03/26 02:03:43 oes
9056 Updated hard-coded copyright dates
9058 Revision 1.123.2.30 2003/03/24 12:58:56 hal9
9059 Add new section on Predefined Filters.
9061 Revision 1.123.2.29 2003/03/20 02:45:29 hal9
9062 More problems with \-\-chroot causing markup problems :(
9064 Revision 1.123.2.28 2003/03/19 00:35:24 hal9
9065 Manual edit of revision log because 'chroot' (even inside a comment) was
9066 causing Docbook to hang here (due to double hyphen and the processor thinking
9069 Revision 1.123.2.27 2003/03/18 19:37:14 oes
9070 s/Advanced|Radical/Adventuresome/g to avoid complaints re fun filter
9072 Revision 1.123.2.26 2003/03/17 16:50:53 oes
9073 Added documentation for new chroot option
9075 Revision 1.123.2.25 2003/03/15 18:36:55 oes
9076 Adapted to the new filters
9078 Revision 1.123.2.24 2002/11/17 06:41:06 hal9
9079 Move default profiles table from FAQ to U-M, and other minor related changes.
9082 Revision 1.123.2.23 2002/10/21 02:32:01 hal9
9083 Updates to the user.action examples section. A few new ones.
9085 Revision 1.123.2.22 2002/10/12 00:51:53 hal9
9086 Add demoronizer to filter section.
9088 Revision 1.123.2.21 2002/10/10 04:09:35 hal9
9089 s/Advanced/Radical/ and added very brief note.
9091 Revision 1.123.2.20 2002/10/10 03:49:21 hal9
9092 Add notes to session-cookies-only and Quickstart about pre-existing
9093 cookies. Also, note content-cookies work differently.
9095 Revision 1.123.2.19 2002/09/26 01:25:36 hal9
9096 More explanation on Privoxy patterns, more on content-cookies and SSL.
9098 Revision 1.123.2.18 2002/08/22 23:47:58 hal9
9099 Add 'Documentation' to Privoxy Menu shot in Configuration section to match
9102 Revision 1.123.2.17 2002/08/18 01:13:05 hal9
9103 Spell checked (only one typo this time!).
9105 Revision 1.123.2.16 2002/08/09 19:20:54 david__schmidt
9106 Update to Mac OSX startup script name
9108 Revision 1.123.2.15 2002/08/07 17:32:11 oes
9109 Converted some internal links from ulink to link for PDF creation; no content changed
9111 Revision 1.123.2.14 2002/08/06 09:16:13 oes
9112 Nits re: actions file download
9114 Revision 1.123.2.13 2002/08/02 18:23:19 g_sauthoff
9115 Just 2 small corrections to the Gentoo sections
9117 Revision 1.123.2.12 2002/08/02 18:17:21 g_sauthoff
9118 Added 2 Gentoo sections
9120 Revision 1.123.2.11 2002/07/26 15:20:31 oes
9121 - Added version info to title
9122 - Added info on new filters
9123 - Revised parts of the filter file tutorial
9124 - Added info on where to get updated actions files
9126 Revision 1.123.2.10 2002/07/25 21:42:29 hal9
9127 Add brief notes on not proxying non-HTTP protocols.
9129 Revision 1.123.2.9 2002/07/11 03:40:28 david__schmidt
9131 Updated Mac OSX sections due to installation location change
9133 Revision 1.123.2.8 2002/06/09 16:36:32 hal9
9134 Clarifications on filtering and MIME. Hardcode 'latest release' in index.html.
9136 Revision 1.123.2.7 2002/06/09 00:29:34 hal9
9137 Touch ups on filtering, in actions section and Anatomy.
9139 Revision 1.123.2.6 2002/06/06 23:11:03 hal9
9140 Fix broken link. Linkchecked all docs.
9142 Revision 1.123.2.5 2002/05/29 02:01:02 hal9
9143 This is break out of the entire config section from u-m, so it can
9144 eventually be used to generate the comments, etc in the main config file
9145 so that these are in sync with each other.
9147 Revision 1.123.2.4 2002/05/27 03:28:45 hal9
9148 Ooops missed something from David.
9150 Revision 1.123.2.3 2002/05/27 03:23:17 hal9
9151 Fix FIXMEs for OS2 and OSX startup. Fix Redhat typos (should be Red Hat).
9152 That's a wrap, I think.
9154 Revision 1.123.2.2 2002/05/26 19:02:09 hal9
9155 Move Amiga stuff around to take of FIXME in start up section.
9157 Revision 1.123.2.1 2002/05/26 17:04:25 hal9
9158 -Spellcheck, very minor edits, and sync across branches
9160 Revision 1.123 2002/05/24 23:19:23 hal9
9161 Include new image (Proxy setup). More fun with guibutton.
9162 Minor corrections/clarifications here and there.
9164 Revision 1.122 2002/05/24 13:24:08 oes
9165 Added Bookmarklet for one-click pre-filled access to show-url-info
9167 Revision 1.121 2002/05/23 23:20:17 oes
9168 - Changed more (all?) references to actions to the
9169 <literal><link> style.
9170 - Small fixes in the actions chapter
9171 - Small clarifications in the quickstart to ad blocking
9172 - Removed <emphasis> from <title>s since the new doc CSS
9173 renders them red (bad in TOC).
9175 Revision 1.120 2002/05/23 19:16:43 roro
9176 Correct Debian specials (installation and startup).
9178 Revision 1.119 2002/05/22 17:17:05 oes
9181 Revision 1.118 2002/05/21 04:54:55 hal9
9182 -New Section: Quickstart to Ad Blocking
9183 -Reformat Actions Anatomy to match new CGI layout
9185 Revision 1.117 2002/05/17 13:56:16 oes
9186 - Reworked & extended Templates chapter
9187 - Small changes to Regex appendix
9188 - #included authors.sgml into (C) and hist chapter
9190 Revision 1.116 2002/05/17 03:23:46 hal9
9191 Fixing merge conflict in Quickstart section.
9193 Revision 1.115 2002/05/16 16:25:00 oes
9194 Extended the Filter File chapter & minor fixes
9196 Revision 1.114 2002/05/16 09:42:50 oes
9197 More ulink->link, added some hints to Quickstart section
9199 Revision 1.113 2002/05/15 21:07:25 oes
9200 Extended and further commented the example actions files
9202 Revision 1.112 2002/05/15 03:57:14 hal9
9203 Spell check. A few minor edits here and there for better syntax and
9206 Revision 1.111 2002/05/14 23:01:36 oes
9209 Revision 1.110 2002/05/14 19:10:45 oes
9210 Restored alphabetical order of actions
9212 Revision 1.109 2002/05/14 17:23:11 oes
9213 Renamed the prevent-*-cookies actions, extended aliases section and moved it before the example AFs
9215 Revision 1.108 2002/05/14 15:29:12 oes
9216 Completed proofreading the actions chapter
9218 Revision 1.107 2002/05/12 03:20:41 hal9
9219 Small clarifications for 127.0.0.1 vs localhost for listen-address since this
9220 apparently an important distinction for some OS's.
9222 Revision 1.106 2002/05/10 01:48:20 hal9
9223 This is mostly proposed copyright/licensing additions and changes. Docs
9224 are still GPL, but licensing and copyright are more visible. Also, copyright
9225 changed in doc header comments (eliminate references to JB except FAQ).
9227 Revision 1.105 2002/05/05 20:26:02 hal9
9228 Sorting out license vs copyright in these docs.
9230 Revision 1.104 2002/05/04 08:44:45 swa
9233 Revision 1.103 2002/05/04 00:40:53 hal9
9234 -Remove the TOC first page kludge. It's fixed proper now in ldp.dsl.in.
9235 -Some minor additions to Quickstart.
9237 Revision 1.102 2002/05/03 17:46:00 oes
9238 Further proofread & reactivated short build instructions
9240 Revision 1.101 2002/05/03 03:58:30 hal9
9241 Move the user-manual config directive to top of section. Add note about
9242 Privoxy needing read permissions for configs, and write for logs.
9244 Revision 1.100 2002/04/29 03:05:55 hal9
9245 Add clarification on differences of new actions files.
9247 Revision 1.99 2002/04/28 16:59:05 swa
9248 more structure in starting section
9250 Revision 1.98 2002/04/28 05:43:59 hal9
9251 This is the break up of configuration.html into multiple files. This
9252 will probably break links elsewhere :(
9254 Revision 1.97 2002/04/27 21:04:42 hal9
9255 -Rewrite of Actions File example.
9256 -Add section for user-manual directive in config.
9258 Revision 1.96 2002/04/27 05:32:00 hal9
9259 -Add short section to Filter Files to tie in with +filter action.
9260 -Start rewrite of examples in Actions Examples (not finished).
9262 Revision 1.95 2002/04/26 17:23:29 swa
9263 bookmarks cleaned, changed structure of user manual, screen and programlisting cleanups, and numerous other changes that I forgot
9265 Revision 1.94 2002/04/26 05:24:36 hal9
9266 -Add most of Andreas suggestions to Chain of Events section.
9267 -A few other minor corrections and touch up.
9269 Revision 1.92 2002/04/25 18:55:13 hal9
9270 More catchups on new actions files, and new actions names.
9271 Other assorted cleanups, and minor modifications.
9273 Revision 1.91 2002/04/24 02:39:31 hal9
9274 Add 'Chain of Events' section.
9276 Revision 1.90 2002/04/23 21:41:25 hal9
9277 Linuxconf is deprecated on RH, substitute chkconfig.
9279 Revision 1.89 2002/04/23 21:05:28 oes
9280 Added hint for startup on Red Hat
9282 Revision 1.88 2002/04/23 05:37:54 hal9
9283 Add AmigaOS install stuff.
9285 Revision 1.87 2002/04/23 02:53:15 david__schmidt
9286 Updated OSX installation section
9287 Added a few English tweaks here an there
9289 Revision 1.86 2002/04/21 01:46:32 hal9
9290 Re-write actions section.
9292 Revision 1.85 2002/04/18 21:23:23 hal9
9293 Fix ugly typo (mine).
9295 Revision 1.84 2002/04/18 21:17:13 hal9
9296 Spell Redhat correctly (ie Red Hat). A few minor grammar corrections.
9298 Revision 1.83 2002/04/18 18:21:12 oes
9299 Added RPM install detail
9301 Revision 1.82 2002/04/18 12:04:50 oes
9304 Revision 1.81 2002/04/18 11:50:24 oes
9305 Extended Install section - needs fixing by packagers
9307 Revision 1.80 2002/04/18 10:45:19 oes
9308 Moved text to buildsource.sgml, renamed some filters, details
9310 Revision 1.79 2002/04/18 03:18:06 hal9
9311 Spellcheck, and minor touchups.
9313 Revision 1.78 2002/04/17 18:04:16 oes
9316 Revision 1.77 2002/04/17 13:51:23 oes
9317 Proofreading, part one
9319 Revision 1.76 2002/04/16 04:25:51 hal9
9320 -Added 'Note to Upgraders' and re-ordered the 'Quickstart' section.
9321 -Note about proxy may need requests to re-read config files.
9323 Revision 1.75 2002/04/12 02:08:48 david__schmidt
9324 Remove OS/2 building info... it is already in the developer-manual
9326 Revision 1.74 2002/04/11 00:54:38 hal9
9327 Add small section on submitting actions.
9329 Revision 1.73 2002/04/10 18:45:15 swa
9332 Revision 1.72 2002/04/10 04:06:19 hal9
9333 Added actions feedback to Bookmarklets section
9335 Revision 1.71 2002/04/08 22:59:26 hal9
9336 Version update. Spell chkconfig correctly :)
9338 Revision 1.70 2002/04/08 20:53:56 swa
9341 Revision 1.69 2002/04/06 05:07:29 hal9
9342 -Add privoxy-man-page.sgml, for man page.
9343 -Add authors.sgml for AUTHORS (and p-authors.sgml)
9344 -Reworked various aspects of various docs.
9345 -Added additional comments to sub-docs.
9347 Revision 1.68 2002/04/04 18:46:47 swa
9348 consistent look. reuse of copyright, history et. al.
9350 Revision 1.67 2002/04/04 17:27:57 swa
9351 more single file to be included at multiple points. make maintaining easier
9353 Revision 1.66 2002/04/04 06:48:37 hal9
9354 Structural changes to allow for conditional inclusion/exclusion of content
9355 based on entity toggles, e.g. 'entity % p-not-stable "INCLUDE"'. And
9356 definition of internal entities, e.g. 'entity p-version "2.9.13"' that will
9357 eventually be set by Makefile.
9358 More boilerplate text for use across multiple docs.
9360 Revision 1.65 2002/04/03 19:52:07 swa
9361 enhance squid section due to user suggestion
9363 Revision 1.64 2002/04/03 03:53:43 hal9
9364 A few minor bug fixes, and touch ups. Ready for review.
9366 Revision 1.63 2002/04/01 16:24:49 hal9
9367 Define entities to include boilerplate text. See doc/source/*.
9369 Revision 1.62 2002/03/30 04:15:53 hal9
9370 - Fix privoxy.org/config links.
9371 - Paste in Bookmarklets from Toggle page.
9372 - Move Quickstart nearer top, and minor rework.
9374 Revision 1.61 2002/03/29 01:31:08 hal9
9377 Revision 1.60 2002/03/27 01:57:34 hal9
9378 Added more to Anatomy section.
9380 Revision 1.59 2002/03/27 00:54:33 hal9
9381 Touch up intro for new name.
9383 Revision 1.58 2002/03/26 22:29:55 swa
9384 we have a new homepage!
9386 Revision 1.57 2002/03/24 20:33:30 hal9
9387 A few minor catch ups with name change.
9389 Revision 1.56 2002/03/24 16:17:06 swa
9390 configure needs to be generated.
9392 Revision 1.55 2002/03/24 16:08:08 swa
9393 we are too lazy to make a block-built
9394 privoxy logo. hence removed the option.
9396 Revision 1.54 2002/03/24 15:46:20 swa
9397 name change related issue.
9399 Revision 1.53 2002/03/24 11:51:00 swa
9400 name change. changed filenames.
9402 Revision 1.52 2002/03/24 11:01:06 swa
9405 Revision 1.51 2002/03/23 15:13:11 swa
9406 renamed every reference to the old name with foobar.
9407 fixed "application foobar application" tag, fixed
9408 "the foobar" with "foobar". left junkbustser in cvs
9409 comments and remarks to history untouched.
9411 Revision 1.50 2002/03/23 05:06:21 hal9
9414 Revision 1.49 2002/03/21 17:01:05 hal9
9415 New section in Appendix.
9417 Revision 1.48 2002/03/12 06:33:01 hal9
9418 Catching up to Andreas and re_filterfile changes.
9420 Revision 1.47 2002/03/11 13:13:27 swa
9421 correct feedback channels
9423 Revision 1.46 2002/03/10 00:51:08 hal9
9424 Added section on JB internal pages in Appendix.
9426 Revision 1.45 2002/03/09 17:43:53 swa
9429 Revision 1.44 2002/03/09 17:08:48 hal9
9430 New section on Jon's actions file editor, and move some stuff around.
9432 Revision 1.43 2002/03/08 00:47:32 hal9
9433 Added imageblock{pattern}.
9435 Revision 1.42 2002/03/07 18:16:55 swa
9438 Revision 1.41 2002/03/07 16:46:43 hal9
9439 Fix a few markup problems for jade.
9441 Revision 1.40 2002/03/07 16:28:39 swa
9442 provide correct feedback channels
9444 Revision 1.39 2002/03/06 16:19:28 hal9
9445 Note on perceived filtering slowdown per FR.
9447 Revision 1.38 2002/03/05 23:55:14 hal9
9448 Stupid I did it again. Double hyphen in comment breaks jade.
9450 Revision 1.37 2002/03/05 23:53:49 hal9
9451 jade barfs on '- -' embedded in comments. - -user option broke it.
9453 Revision 1.36 2002/03/05 22:53:28 hal9
9454 Add new - - user option.
9456 Revision 1.35 2002/03/05 00:17:27 hal9
9457 Added section on command line options.
9459 Revision 1.34 2002/03/04 19:32:07 oes
9460 Changed default port to 8118
9462 Revision 1.33 2002/03/03 19:46:13 hal9
9463 Emphasis on where/how to report bugs, etc
9465 Revision 1.32 2002/03/03 09:26:06 joergs
9466 AmigaOS changes, config is now loaded from PROGDIR: instead of
9467 AmiTCP:db/junkbuster/ if no configuration file is specified on the
9470 Revision 1.31 2002/03/02 22:45:52 david__schmidt
9473 Revision 1.30 2002/03/02 22:00:14 hal9
9474 Updated 'New Features' list. Ran through spell-checker.
9476 Revision 1.29 2002/03/02 20:34:07 david__schmidt
9477 Update OS/2 build section
9479 Revision 1.28 2002/02/24 14:34:24 jongfoster
9480 Formatting changes. Now changing the doctype to DocBook XML 4.1
9481 will work - no other changes are needed.
9483 Revision 1.27 2002/01/11 14:14:32 hal9
9484 Added a very short section on Templates
9486 Revision 1.26 2002/01/09 20:02:50 hal9
9487 Fix bug re: auto-detect config file changes.
9489 Revision 1.25 2002/01/09 18:20:30 hal9
9490 Touch ups for *.action files.
9492 Revision 1.24 2001/12/02 01:13:42 hal9
9495 Revision 1.23 2001/12/02 00:20:41 hal9
9496 Updates for recent changes.
9498 Revision 1.22 2001/11/05 23:57:51 hal9
9499 Minor update for startup now daemon mode.
9501 Revision 1.21 2001/10/31 21:11:03 hal9
9502 Correct 2 minor errors
9504 Revision 1.18 2001/10/24 18:45:26 hal9
9505 *** empty log message ***
9507 Revision 1.17 2001/10/24 17:10:55 hal9
9508 Catching up with Jon's recent work, and a few other things.
9510 Revision 1.16 2001/10/21 17:19:21 swa
9511 wrong url in documentation
9513 Revision 1.15 2001/10/14 23:46:24 hal9
9514 Various minor changes. Fleshed out SEE ALSO section.
9516 Revision 1.13 2001/10/10 17:28:33 hal9
9519 Revision 1.12 2001/09/28 02:57:04 hal9
9522 Revision 1.11 2001/09/28 02:25:20 hal9
9525 Revision 1.9 2001/09/27 23:50:29 hal9
9526 A few changes. A short section on regular expression in appendix.
9528 Revision 1.8 2001/09/25 00:34:59 hal9
9529 Some additions, and re-arranging.
9531 Revision 1.7 2001/09/24 14:31:36 hal9
9534 Revision 1.6 2001/09/24 14:10:32 hal9
9535 Including David's OS/2 installation instructions.
9537 Revision 1.2 2001/09/13 15:27:40 swa
9540 Revision 1.1 2001/09/12 15:36:41 swa
9541 source files for junkbuster documentation
9543 Revision 1.3 2001/09/10 17:43:59 swa
9544 first proposal of a structure.
9546 Revision 1.2 2001/06/13 14:28:31 swa
9547 docs should have an author.
9549 Revision 1.1 2001/06/13 14:20:37 swa
9550 first import of project's documentation for the webserver.