This file belongs into
ijbswa.sourceforge.net:/home/groups/i/ij/ijbswa/htdocs/
- $Id: user-manual.sgml,v 1.125 2002/06/03 00:28:17 hal9 Exp $
+ $Id: user-manual.sgml,v 1.126 2002/06/05 00:31:55 hal9 Exp $
Copyright (C) 2001, 2002 Privoxy Developers <developers@privoxy.org>
See LICENSE.
</subscript>
</pubdate>
-<pubdate>$Id: user-manual.sgml,v 1.125 2002/06/03 00:28:17 hal9 Exp $</pubdate>
+<pubdate>$Id: user-manual.sgml,v 1.126 2002/06/05 00:31:55 hal9 Exp $</pubdate>
<!--
The name of a filter, as defined in the <link linkend="filter-file">filter file</link>
(typically <filename>default.filter</filename>, set by the
<literal><link linkend="filterfile">filterfile</link></literal>
- option in the <link linkend="config">config file</link>)
+ option in the <link linkend="config">config file</link>). Filtering
+ can be completely disabled without the use of parameters.
</para>
</listitem>
</varlistentry>
<term>Notes:</term>
<listitem>
<para>
- For your convenience, there are a bunch of pre-defined filters available
- in the distribution filter file that you can use. See the example below for
+ For your convenience, there are a number of pre-defined filters available
+ in the distribution filter file that you can use. See the examples below for
a list.
</para>
<para>
since the page is not incrementally displayed.) This effect will be more
noticeable on slower connections.
</para>
+ <para>
+ The amount of data that can be filtered is limited to the
+ <literal><link linkend="buffer-limit">buffer-limit</link></literal>
+ option in the main <link linkend="config">config file</link>. The
+ default is 4096 KB (4 Megs). Once this limit is exceeded, the buffered
+ data, and all pending data, is passed through unfiltered. Inappropriate
+ MIME types are not filtered.
+ </para>
<para>
At this time, <application>Privoxy</application> cannot (yet!) uncompress compressed
documents. If you want filtering to work on all documents, even those that
action in conjunction with <literal>filter</literal>.
</para>
<para>
- Filtering can achieve some of the effects as the
+ Filtering can achieve some of the same effects as the
<literal><link linkend="block">block</link></literal>
- action, i.e. it can be used to block ads and banners.
+ action, i.e. it can be used to block ads and banners. But the mechanism
+ works quite differently. One effective use, is to block ad banners
+ based on their size (see below), since many of these seem to be somewhat
+ standardized.
</para>
<para>
- <link linkend="contact">Feedback</link> with suggestions for new or improved filters is particularly
- welcome!
+ <link linkend="contact">Feedback</link> with suggestions for new or
+ improved filters is particularly welcome!
</para>
</listitem>
</varlistentry>
</para>
<para>
<anchor id="filter-banners-by-size">
- <screen>+filter{banners-by-size} # Kill banners by size (<emphasis>very</emphasis> efficient!)</screen>
+ <screen>+filter{banners-by-size} # Kill banners based on their size for this page (<emphasis>very</emphasis> efficient!)</screen>
</para>
<para>
<anchor id="filter-content-cookies">
in a syntax that imitates <ulink url="http://www.perl.org/">Perl</ulink>'s
<literal>s///</literal> operator. If you are familiar with Perl, you
will find this to be quite intuitive, and may want to look at the
- <ulink url="http://www.oesterhelt.org/pcrs/pcrs.1.html">PCRS man page</ulink>
+ <ulink url="http://www.oesterhelt.org/pcrs/pcrs.3.html">PCRS man page</ulink>
for the subtle differences to Perl behaviour. Most notably, the non-standard
option letter <literal>U</literal> is supported, which turns the default
to ungreedy matching.
Note the <literal>(?!\.com)</literal> part (a so-called negative lookahead)
in the job's pattern, which means: Don't match, if the string
<quote>.com</quote> appears directly following <quote>microsoft</quote>
- in the page. This prevents links to microsoft.com from being messed, while
+ in the page. This prevents links to microsoft.com from being trashed, while
still replacing the word everywhere else.
</para>
One quick test to see if <application>Privoxy</application> is causing a problem
or not, is to disable it temporarily. This should be the first troubleshooting
step. See <link linkend="bookmarklets">the Bookmarklets</link> section on a quick
- and easy way to do this (be sure to flush caches afterward!).
+ and easy way to do this (be sure to flush caches afterward!). Looking at the
+ logs is a good idea too.
</para>
<para>
was. If you don't get this kind of match, then it means one of the default
rules in the first section is causing the problem. This would require some
guesswork, and maybe a little trial and error to isolate the offending rule.
- One likely cause would be one of the <quote>{+filter}</quote> actions. Try
- adding the URL for the site to one of aliases that turn off <quote>+filter</quote>:
+ One likely cause would be one of the <quote>{+filter}</quote> actions. These
+ tend to be harder to troubleshoot. Try adding the URL for the site to one of
+ aliases that turn off <quote>+filter</quote>:
</para>
<para>
</para>
<para>
- This would probably be most appropriately put in <filename>user.action</filename>,
- for local site exceptions.
+ This would turn off all filtering for that site. This would probably be most
+ appropriately put in <filename>user.action</filename>, for local site
+ exceptions.
+</para>
+
+<para>
+ Images that are inexplicably being blocked, may well be hitting the
+ <quote>+filter{banners-by-size}</quote> rule, which assumes
+ that images of certain sizes are ad banners (works well most of the time
+ since these tend to be standardized).
</para>
<para>
Temple Place - Suite 330, Boston, MA 02111-1307, USA.
$Log: user-manual.sgml,v $
+ Revision 1.126 2002/06/05 00:31:55 hal9
+ Mass commit for new entities, most significantly so docs can read version
+ and code status info from tmp files, so perl is no longer used. Also, docs can
+ differentiate on alpha -> beta -> stable now.
+
Revision 1.125 2002/06/03 00:28:17 hal9
Sync with various changes from 3.0 branch. Add two new files for config stuff.
projects / privoxy.git / blobdiff