>Miscellaneous</TITLE
><META
NAME="GENERATOR"
-CONTENT="Modular DocBook HTML Stylesheet Version 1.64
+CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
"><LINK
REL="HOME"
TITLE="Privoxy Frequently Asked Questions"
><DIV
CLASS="NAVHEADER"
><TABLE
+SUMMARY="Header navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
VALIGN="bottom"
><A
HREF="configuration.html"
+ACCESSKEY="P"
>Prev</A
></TD
><TD
VALIGN="bottom"
><A
HREF="trouble.html"
+ACCESSKEY="N"
>Next</A
></TD
></TR
><H1
CLASS="SECT1"
><A
-NAME="MISC"
->4. Miscellaneous</A
-></H1
+NAME="MISC">4. Miscellaneous</H1
><DIV
CLASS="SECT2"
><H3
CLASS="SECT2"
><A
-NAME="AEN396"
->4.1. How much does <SPAN
+NAME="AEN528">4.1. How much does <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
> slow my browsing down? This
-has to add extra time to browsing.</A
-></H3
+has to add extra time to browsing.</H3
><P
> It should not slow you down any in real terms, and may actually help
speed things up since ads, banners and other junk are not being displayed.
> <SPAN
CLASS="QUOTE"
>"Filtering"</SPAN
-> via the <TT
-CLASS="FILENAME"
->filterfile</TT
->
- mechanism may cause a perceived slowdown, since the entire page is buffered
+> content via the <TT
+CLASS="LITERAL"
+><A
+HREF="../user-manual/actions-file.html#FILTER"
+TARGET="_top"
+>filter</A
+></TT
+> or
+ <TT
+CLASS="LITERAL"
+><A
+HREF="../user-manual/actions-file.html#DEANIMATE-GIFS"
+TARGET="_top"
+>deanimate-gifs</A
+></TT
+>
+ actions may cause a perceived slowdown, since the entire document needs to be buffered
before displaying. See below.</P
></DIV
><DIV
><H3
CLASS="SECT2"
><A
-NAME="LOADINGTIMES"
->4.2. I noticed considerable
-delays in page requests compared to the old Junkbuster. What's wrong?</A
-></H3
-><P
->The entire page content must be loaded into memory in order for the filtering
-mechanism to work, and nothing is sent to the browser during this time. The
-loading time does not really change in real numbers, but the feeling is
-different, because most browsers are able to start rendering incomplete
-content, giving the user a feeling of "it works".
+NAME="LOADINGTIMES">4.2. I noticed considerable
+delays in page requests compared to the old Junkbuster. What's wrong?</H3
+><P
+> If you use any <TT
+CLASS="LITERAL"
+><A
+HREF="../user-manual/actions-file.html#FILTER"
+TARGET="_top"
+>filter</A
+></TT
+> action,
+ such as filtering banners by size, web-bugs etc, or the <TT
+CLASS="LITERAL"
+><A
+HREF="../user-manual/actions-file.html#DEANIMATE-GIFS"
+TARGET="_top"
+>deanimate-gifs</A
+></TT
+>
+ action, the entire document must be loaded into memory in order for the filtering
+ mechanism to work, and nothing is sent to the browser during this time.</P
+><P
+> The loading time does not really change in real numbers, but the feeling is
+ different, because most browsers are able to start rendering incomplete
+ content, giving the user a feeling of "it works". This effect is especially
+ noticeable on slow dialup connections.
</P
><P
-> To modify the content of a page (i.e. make frames resizeable again, etc.) and
- not just replace ads, <SPAN
-CLASS="APPLICATION"
->Privoxy</SPAN
-> needs to download
- the entire page first, do its content magic and then send the page to the
- browser.</P
+> Filtering is automatically disabled for inappropriate MIME types. </P
></DIV
><DIV
CLASS="SECT2"
><H3
CLASS="SECT2"
><A
-NAME="CONFIGURL"
->4.3. What is the "http://p.p/"?</A
-></H3
-><P
->Since <SPAN
-CLASS="APPLICATION"
->Privoxy</SPAN
-> sits between your web browser and the Internet, it can be
-programmed to handle certain pages specially.</P
+NAME="CONFIGURL">4.3. What are "http://config.privoxy.org/" and
+"http://p.p/"?</H3
><P
-> With recent versions of <SPAN
-CLASS="APPLICATION"
->Privoxy</SPAN
-> (version 2.9.x and
- greater), you can get some information about
- <SPAN
+> <A
+HREF="http://config.privoxy.org/"
+TARGET="_top"
+>http://config.privoxy.org/</A
+> is the
+ address of <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
-> and change some settings by going to
+>'s built-in user interface, and
<A
HREF="http://p.p/"
TARGET="_top"
>http://p.p/</A
-> or, equivalently, <A
+> is a shortcut for it.</P
+><P
+> Since <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> sits between your web browser and the Internet,
+ it can simply intercept requests for these addresses and answer them with its built-in
+ <SPAN
+CLASS="QUOTE"
+>"web server"</SPAN
+>.</P
+><P
+> This also makes for a good test for your browser configuration: If entering the
+ URL <A
HREF="http://config.privoxy.org/"
TARGET="_top"
>http://config.privoxy.org/</A
-> (Note
- that p.p is far easier to type but may not work in some configurations. With
- the name change to <SPAN
+>
+ takes you to a page saying <SPAN
+CLASS="QUOTE"
+>"This is Privoxy.."</SPAN
+>, everything is OK.
+ If you get a page saying <SPAN
+CLASS="QUOTE"
+>"Privoxy is not working"</SPAN
+> instead, then
+ your browser didn't use <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
->, this is changed from
- the previous http://i.j.b/ and earlier 2.9.x versions).</P
-><P
-> These pages are <I
+> for the request,
+ hence it could not be intercepted, and you have accessed the <SPAN
+CLASS="emphasis"
+><I
CLASS="EMPHASIS"
->not</I
-> forwarded to a server on the
- Internet - instead they are handled by a special web server which is built in to
- <SPAN
+>real</I
+></SPAN
+>
+ web site at config.privoxy.org.</P
+><P
+> With recent versions of <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
+> (version 2.9.x and
+ later), the user interface features information on the run time status, the
+ configuration, and even a built-in editor for the <A
+HREF="../user-manual/actions-file.html"
+TARGET="_top"
+>actions files</A
>.</P
><P
-> If you are not running <SPAN
+> Note that the built-in URLs from earlier versions of <SPAN
CLASS="APPLICATION"
->Privoxy</SPAN
->, then <A
-HREF="http://p.p/"
-TARGET="_top"
->http://p.p/</A
-> will fail, and <A
-HREF="http://config.privoxy.org/"
-TARGET="_top"
->http://config.privoxy.org/</A
-> will
- return a web page telling you you're not running
- <SPAN
+>Junkbuster</SPAN
+>
+ / <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
->.</P
-><P
-> If you have version 2.0.2, then the equivalent is
- http://example.com/show-proxy-args (but you get far less information, and
- you should really consider upgrading to 2.9.15).</P
+>, http://example.com/show-proxy-args and http://i.j.b/,
+ are no longer supported. If you still use such an old version, you should really consider
+ upgrading to 3.1.1.</P
></DIV
><DIV
CLASS="SECT2"
><H3
CLASS="SECT2"
><A
-NAME="BLOCKLIST"
->4.4. Do you still maintain the blocklists?</A
-></H3
+NAME="BLOCKLIST">4.4. Do you still maintain the blocklists?</H3
><P
-> No, not by this name. The format of the blocklists has changed
- significantly in versions 2.9.x and later. This functionality
- is done by the <SPAN
-CLASS="QUOTE"
->"actions"</SPAN
-> file now. See next question ...</P
+> No. The patterns for blocking now reside (among other things) in the <A
+HREF="../user-manual/actions-file.html"
+TARGET="_top"
+>actions files</A
+>, which are
+ actively maintained instead. See next question ...</P
></DIV
><DIV
CLASS="SECT2"
><H3
CLASS="SECT2"
><A
-NAME="NEWADS"
->4.5. How can I submit new ads?</A
-></H3
+NAME="NEWADS">4.5. How can I submit new ads?</H3
><P
->Please see the <A
+>
Yes, absolutely! Please see the <A
HREF="contact.html"
>Contact section</A
->.</P
-><P
-> This process does not work with earlier versions of <SPAN
+> for
+how to do that. Please note that you (technically) need the latest
+<SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
->
- or <SPAN
-CLASS="APPLICATION"
->Junkbuster</SPAN
->.</P
+> version for this to work.</P
></DIV
><DIV
CLASS="SECT2"
><H3
CLASS="SECT2"
><A
-NAME="IP"
->4.6. How can I hide my IP address?</A
-></H3
+NAME="IP">4.6. How can I hide my IP address?</H3
><P
-> You cannot hide your IP address with <SPAN
+> If you run both the browser and the proxy locally, you cannot hide your IP
+ address with <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
-> or any other software, since
-the server needs to know your IP address to send the answers back to you.</P
+> or any other software. The
+ server needs to know your IP address to send the answers back to you. </P
><P
->Fortunately there are many publicly usable anonymous proxies out there, which
-solve the problem by providing a further level of indirection between you and
-the web server, shared by many people and thus letting your requests "drown"
-in white noise of unrelated requests as far as user tracking is concerned.</P
+> Fortunately there are many publicly usable anonymous proxies out there, which
+ solve the problem by providing a further level of indirection between you and
+ the web server, shared by many people, and thus letting your requests "drown"
+ in white noise of unrelated requests as far as user tracking is concerned.</P
><P
->Most of them will, however, log your IP address and make it available to the
-authorities in case you abuse that anonymity for criminal purposes. In fact
-you can't even rule out that some of them only exist to *collect* information
-on (those suspicious) people with a more than average preference for privacy.</P
+> Most of them will, however, log your IP address and make it available to the
+ authorities in case you abuse that anonymity for criminal purposes. In fact
+ you can't even rule out that some of them only exist to *collect* information
+ on (those suspicious) people with a more than average preference for privacy.</P
><P
->You can find a list of anonymous public proxies at <A
+>
You can find a list of anonymous public proxies at <A
HREF="http://www.multiproxy.org/anon_list.htm"
TARGET="_top"
>multiproxy.org</A
> and many
-more through Google.</P
+ more through Google. A particularly interesting project is the JAP service
+ offered by the Technical University of Dresden (<A
+HREF="http://anon.inf.tu-dresden.de/index_en.html"
+TARGET="_top"
+>http://anon.inf.tu-dresden.de/index_en.html</A
+>.</P
+><P
+> There is, however, even in the single-machine case the possibility to make the
+ server believe that your machine is in fact a shared proxy serving a whole big
+ LAN, and we are looking into that.</P
></DIV
><DIV
CLASS="SECT2"
><H3
CLASS="SECT2"
><A
-NAME="AEN447"
->4.7. Can <SPAN
+NAME="AEN588">4.7. Can <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
-> guarantee I am anonymous?</A
-></H3
+> guarantee I am anonymous?</H3
><P
> No. Your chances of remaining anonymous are greatly improved, but unless you
are an expert on Internet security it would be safest to assume that
CLASS="APPLICATION"
>Privoxy</SPAN
> can remove various information about you,
- and allows <I
+ and allows <SPAN
+CLASS="emphasis"
+><I
CLASS="EMPHASIS"
>you</I
+></SPAN
> more freedom to decide which sites
you can trust, and what details you want to reveal. But it's still possible
that web sites can find out who you are. Here's one way this can happen.</P
><H3
CLASS="SECT2"
><A
-NAME="AEN458"
->4.8. Might some things break because header information is
-being altered?</A
-></H3
+NAME="AEN599">4.8. Might some things break because header information or
+content is being altered?</H3
><P
> Definitely. More and more sites use HTTP header content to decide what to
display and how to display it. There is many ways that this can be handled,
><P
> <SPAN
CLASS="QUOTE"
->"USER AGENT"</SPAN
+>"User-Agent"</SPAN
> in particular is often used in this way to identify
- the browser, and adjust content accordingly. Changing this now is not
- recommended, since so many sites do look for this. You may get undesirable
- results by changing this.</P
+ the browser, and adjust content accordingly. Changing this now (at least not
+ further than removing the OS information) is not recommended, since so many
+ sites do look for it. You may get undesirable results by changing this.</P
><P
> For instance, different browsers use different encodings of Russian and Czech
characters, certain web servers convert pages on-the-fly according to the
something closer. And then some page access counters work by looking at the
<SPAN
CLASS="QUOTE"
->"REFERER"</SPAN
+>"Referer"</SPAN
> header; they may fail or break if unavailable. The
weather maps of Intellicast have been blocked by their server when no
<SPAN
CLASS="QUOTE"
->"REFERER"</SPAN
-> or cookie is provided, is another example. There are
- many, many other ways things can go wrong when trying to fool a web server.</P
+>"Referer"</SPAN
+> or cookie is provided, is another example. (But you
+ can forge both headers without giving information away). There are
+ many other ways things can go wrong when trying to fool a web server.</P
+><P
+> Similar thoughts apply to modifying JavaScript, and, to a lesser degree,
+ HTML elements.</P
><P
> If you have problems with a site, you will have to adjust your configuration
accordingly. Cookies are probably the most likely adjustment that may
><H3
CLASS="SECT2"
><A
-NAME="AEN468"
->4.9. Can <SPAN
+NAME="AEN610">4.9. Can <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
> act as a <SPAN
CLASS="QUOTE"
>"caching"</SPAN
> proxy to
-speed up web browsing?</A
-></H3
+speed up web browsing?</H3
><P
> No, it does not have this ability at all. You want something like
<A
with other kinds of proxies like <SPAN
CLASS="APPLICATION"
>Squid</SPAN
->.</P
-></DIV
-><DIV
-CLASS="SECT2"
-><H3
-CLASS="SECT2"
-><A
-NAME="AEN476"
->4.10. What about as a firewall? Can <SPAN
-CLASS="APPLICATION"
->Privoxy</SPAN
-> protect me?</A
-></H3
-><P
-> Not in the way you mean, or in the way a true firewall can, or a proxy that
- has this specific capability. <SPAN
-CLASS="APPLICATION"
->Privoxy</SPAN
-> can help
- protect your privacy, but not really protect you from intrusion attempts.</P
+>.
+ See the <A
+HREF="../user-manual/config.html#FORWARDING"
+TARGET="_top"
+>forwarding
+ chapter</A
+> in the <A
+HREF="../user-manual/index.html"
+TARGET="_top"
+>user
+ manual</A
+> for details.</P
></DIV
><DIV
CLASS="SECT2"
><H3
CLASS="SECT2"
><A
-NAME="AEN481"
->4.11. The <SPAN
+NAME="AEN620">4.10. What about as a firewall? Can <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
-> logo that replaces ads is very blocky
-and ugly looking. Can't a better font be used?</A
-></H3
+> protect me?</H3
><P
-> This is not a font problem. The logo is an image that is created by
+> Not in the way you mean, or in the way a true firewall can.
<SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
-> on the fly. So as to not waste
- memory, the image is rather small. The blockiness comes when the
- image is scaled to fill a largish area. There is not much to be done
- about this, other than to use one of the other
- <SPAN
-CLASS="QUOTE"
->"imageblock"</SPAN
-> directives: <I
-CLASS="EMPHASIS"
->pattern</I
->,
- <I
+> can help protect your privacy, but not
+ protect you from intrusion attempts. It is, of course, perfectly possible
+ and recommended to use <SPAN
+CLASS="emphasis"
+><I
CLASS="EMPHASIS"
->blank</I
->, or a URL of your choosing.</P
-><P
->Given the above problem, we have decided to remove the logo option entirely
-[as of v2.9.13].</P
+>both</I
+></SPAN
+>.</P
></DIV
><DIV
CLASS="SECT2"
><H3
CLASS="SECT2"
><A
-NAME="AEN490"
->4.12. I have large empty spaces now where ads used to be.
-Why?</A
-></H3
-><P
-> It would be easy enough to just eliminate this space altogether, rather than
- fill it with blank space. But, this would create problems with many pages
- that use the overall size of the ad to help organize the page layout and
- position the various components of the page where they were intended to be.
- It is best left this way.</P
+NAME="AEN626">4.11. I have large empty spaces / a checkerboard pattern now where
+ads used to be. Why?</H3
+><P
+> It would be technically possible eliminate the banners in a way that frees
+ their screen estate in many cases, by doing all banner blocking with filters,
+ i.e. eliminating the whole image references from the HTML pages instead
+ of letting them stay in, and blocking the resulting requests for the
+ banners themselves.</P
+><P
+> But this would consume considerable CPU resources, would likely destroy
+ the layout of many web pages which rely on the banners consuming a certain
+ amount of screen space, and would fail in other cases, where the screen space
+ is reserved e.g. by tables anyway. Also, making the banners disappear without
+ a visual trace complicates troubleshooting.</P
+><P
+> So we won't support this in the default configuration, but you can of course
+ define appropriate filters yourself.</P
></DIV
><DIV
CLASS="SECT2"
><H3
CLASS="SECT2"
><A
-NAME="AEN493"
->4.13. How can <SPAN
+NAME="AEN631">4.12. How can <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
-> filter Secure (HTTPS) URLs?</A
-></H3
+> filter Secure (HTTPS) URLs?</H3
><P
-> This is a limitation since HTTPS transactions are encrypted SSL sessions
- between your browser and the secure site, and are meant to be reliably
- <I
+> Since secure HTTP connections are encrypted SSL sessions between your browser
+ and the secure site, and are meant to be reliably <SPAN
+CLASS="emphasis"
+><I
CLASS="EMPHASIS"
>secure</I
-> and private. This means that all cookies and HTTP
- header information are also encrypted from the time they leave your browser,
- to the site, and vice versa. <SPAN
+></SPAN
+>,
+ there is little that <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> can do but hand the raw
+ gibberish data though from one end to the other unprocessed.</P
+><P
+> The only exception to this is blocking by host patterns, as the client needs
+ to tell <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> the name of the remote server,
+ so that <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
-> does not
- try to unencrypt this information, so it just passes through as is.
+> can establish the connection.
+ If that name matches a host-only pattern, the connection will be blocked.</P
+><P
+> As far as ad blocking is concerned, this is less of a restriction than it may
+ seem, since ad sources are often identifiable by the host name, and often
+ the banners to be placed in an encrypted page come unencrypted nonetheless
+ for efficiency reasons, which exposes them to the full power of
<SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
-> can still catch images and ads that
- are embedded in the SSL stream though.</P
+>'s ad blocking.</P
></DIV
><DIV
CLASS="SECT2"
><H3
CLASS="SECT2"
><A
-NAME="AEN500"
->4.14. <SPAN
+NAME="AEN642">4.13. <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
> runs as a <SPAN
CLASS="QUOTE"
>"server"</SPAN
>. How
-secure is it? Do I need to take any special precautions?</A
-></H3
+secure is it? Do I need to take any special precautions?</H3
><P
-> There are no known exploits that might effect
+> There are no known exploits that might affect
<SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
from <SPAN
CLASS="QUOTE"
>"localhost"</SPAN
->. The server aspect of
+> only. The server aspect of
<SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
<SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
-> config file. All LAN hosts can then use
- this as their proxy address in the browser proxy configuration. In this way,
- <SPAN
+> configuration file and check all <A
+HREF="../user-manual/config.html#ACCESS-CONTROL"
+TARGET="_top"
+>access control and security
+ options</A
+>. All LAN hosts can then use this as their proxy address
+ in the browser proxy configuration, but <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
-> will not listen on any external ports.
- Of course, a firewall is always good too. Better safe than sorry.</P
+>
+ will not listen on any external interfaces. ACLs can be defined in addition,
+ and using a firewall is always good too. Better safe than sorry.</P
></DIV
><DIV
CLASS="SECT2"
><H3
CLASS="SECT2"
><A
-NAME="TURNOFF"
->4.15. How can I temporarily disable <SPAN
+NAME="TURNOFF">4.14. How can I temporarily disable <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
->?</A
-></H3
+>?</H3
><P
> The easiest way is to access <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
> with your
- browser by using the
special URL: <A
-HREF="http://p.p/"
+ browser by using the
remote toggle URL: <A
+HREF="http://config.privoxy.org/toggle"
TARGET="_top"
->http://p.p/</A
->
- and select "Toggle Privoxy on or off" from that page. </P
+>http://config.privoxy.org/toggle</A
+>.
+ See the <A
+HREF="../user-manual/appendix.html#BOOKMARKLETS"
+TARGET="_top"
+>Bookmarklets section</A
+>
+ of the <I
+CLASS="CITETITLE"
+>User Manual</I
+> for an easy way to access this
+ feature.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="REALLYOFF">4.15. When <SPAN
+CLASS="QUOTE"
+>"disabled"</SPAN
+> is <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> totally
+out of the picture?</H3
+><P
+> No, this just means all filtering and actions are disabled.
+ <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> is still acting as a proxy, but just not
+ doing any of the things that <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> would
+ normally be expected to do. It is still a <SPAN
+CLASS="QUOTE"
+>"middle-man"</SPAN
+> in
+ the interaction between your browser and web sites.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="CRUNCH">4.16. My logs show <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> <SPAN
+CLASS="QUOTE"
+>"crunches"</SPAN
+>
+ads, but also its own CGI pages. What is a <SPAN
+CLASS="QUOTE"
+>"crunch"</SPAN
+>?</H3
+><P
+> A <SPAN
+CLASS="QUOTE"
+>"crunch"</SPAN
+> simply means <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> intercepted
+ <SPAN
+CLASS="emphasis"
+><I
+CLASS="EMPHASIS"
+>something</I
+></SPAN
+>, nothing more. Often this is indeed ads or
+ banners, but <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> uses the same mechanism for
+ trapping requests for its own internal pages. For instance, a request for
+ <SPAN
+CLASS="APPLICATION"
+>Privoxy's</SPAN
+> configuration page at: <A
+HREF="http://config.privoxy.org"
+TARGET="_top"
+>http://config.privoxy.org</A
+>, is
+ intercepted (i.e. it does not go out to the 'net), and the familiar CGI
+ configuration is returned to the browser, and the log consequently will show
+ a <SPAN
+CLASS="QUOTE"
+>"crunch"</SPAN
+>.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="DOWNLOADS">4.17. Can <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> effect files that I download
+from a webserver? FTP server?</H3
+><P
+> From the webserver's perspective, there is no difference between
+ viewing a document (i.e. a page), and downloading a file. The same is true of
+ <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+>. If there is a match for a <TT
+CLASS="LITERAL"
+><A
+HREF="../user-manual/actions-file.html#BLOCK"
+TARGET="_top"
+>block</A
+></TT
+> pattern,
+ it will still be blocked, and of course this is obvious. Filtering is
+ potentially more of a concern since the results are not always so obvious.</P
+><P
+> <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> knows the differences in files according
+ to the <SPAN
+CLASS="QUOTE"
+>"Document Type"</SPAN
+> as reported by the webserver. If this is
+ reported accurately (e.g. <SPAN
+CLASS="QUOTE"
+>"application/zip"</SPAN
+> for a zip archive),
+ then <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> knows to ignore these where
+ appropriate. It is possible, however, that documents that are of an unknown
+ type (generally assumed to be <SPAN
+CLASS="QUOTE"
+>"text/plain"</SPAN
+>) will be filtered, as
+ will those that might be incorrectly reported by the webserver. If such a
+ file is a downloaded file that is intended to be saved to disk, then any
+ content that might have been altered by filtering, will be saved too, for
+ these (probably very rare) cases.</P
+><P
+> <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> does not do FTP at all, only HTTP
+ protocols.</P
></DIV
><DIV
CLASS="SECT2"
><H3
CLASS="SECT2"
><A
-NAME="SEEALSO"
->4.16. Where can I find more information about <SPAN
+NAME="SEEALSO">4.18. Where can I find more information about <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
>
-and related issues?</A
-></H3
+and related issues?</H3
><P
> Other references and sites of interest to <SPAN
CLASS="APPLICATION"
><TR
><TD
> <A
+HREF="http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/ijbswa/contrib/"
+TARGET="_top"
+>http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/ijbswa/contrib/</A
+>, cool
+ and fun ideas from <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> users.
+ </TD
+></TR
+></TBODY
+></TABLE
+><P
+></P
+>
+ <P
+></P
+><TABLE
+BORDER="0"
+><TBODY
+><TR
+><TD
+> <A
HREF="http://www.junkbusters.com/ht/en/cookies.html"
TARGET="_top"
>http://www.junkbusters.com/ht/en/cookies.html</A
><HR
ALIGN="LEFT"
WIDTH="100%"><TABLE
+SUMMARY="Footer navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
VALIGN="top"
><A
HREF="configuration.html"
+ACCESSKEY="P"
>Prev</A
></TD
><TD
VALIGN="top"
><A
HREF="index.html"
+ACCESSKEY="H"
>Home</A
></TD
><TD
VALIGN="top"
><A
HREF="trouble.html"
+ACCESSKEY="N"
>Next</A
></TD
></TR
projects / privoxy.git / blobdiff