<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >Actions Files</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE="Privoxy 3.0.12 User Manual" HREF="index.html"><LINK REL="PREVIOUS" TITLE="The Main Configuration File" HREF="config.html"><LINK REL="NEXT" TITLE="Filter Files" HREF="filter-file.html"><LINK REL="STYLESHEET" TYPE="text/css" HREF="../p_doc.css"><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=ISO-8859-1"> <LINK REL="STYLESHEET" TYPE="text/css" HREF="p_doc.css"> </head ><BODY CLASS="SECT1" BGCOLOR="#EEEEEE" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >Privoxy 3.0.12 User Manual</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="config.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="filter-file.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="ACTIONS-FILE" >8. Actions Files</A ></H1 ><P > The actions files are used to define what <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >actions</I ></SPAN > <SPAN CLASS="APPLICATION" >Privoxy</SPAN > takes for which URLs, and thus determines how ad images, cookies and various other aspects of HTTP content and transactions are handled, and on which sites (or even parts thereof). There are a number of such actions, with a wide range of functionality. Each action does something a little different. These actions give us a veritable arsenal of tools with which to exert our control, preferences and independence. Actions can be combined so that their effects are aggregated when applied against a given set of URLs.</P ><P > There are three action files included with <SPAN CLASS="APPLICATION" >Privoxy</SPAN > with differing purposes:</P ><P > <P ></P ><UL ><LI ><P > <TT CLASS="FILENAME" >match-all.action</TT > - is used to define which <SPAN CLASS="QUOTE" >"actions"</SPAN > relating to banner-blocking, images, pop-ups, content modification, cookie handling etc should be applied by default. It should be the first actions file loaded </P ></LI ><LI ><P > <TT CLASS="FILENAME" >default.action</TT > - defines many exceptions (both positive and negative) from the default set of actions that's configured in <TT CLASS="FILENAME" >match-all.action</TT >. It is a set of rules that should work reasonably well as-is for most users. This file is only supposed to be edited by the developers. It should be the second actions file loaded. </P ></LI ><LI ><P > <TT CLASS="FILENAME" >user.action</TT > - is intended to be for local site preferences and exceptions. As an example, if your ISP or your bank has specific requirements, and need special handling, this kind of thing should go here. This file will not be upgraded. </P ></LI ><LI ><P > <SPAN CLASS="GUIBUTTON" >Edit</SPAN > <SPAN CLASS="GUIBUTTON" >Set to Cautious</SPAN > <SPAN CLASS="GUIBUTTON" >Set to Medium</SPAN > <SPAN CLASS="GUIBUTTON" >Set to Advanced</SPAN > </P ><P > These have increasing levels of aggressiveness <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >and have no influence on your browsing unless you select them explicitly in the editor</I ></SPAN >. A default installation should be pre-set to <TT CLASS="LITERAL" >Cautious</TT >. New users should try this for a while before adjusting the settings to more aggressive levels. The more aggressive the settings, then the more likelihood there is of problems such as sites not working as they should. </P ><P > The <SPAN CLASS="GUIBUTTON" >Edit</SPAN > button allows you to turn each action on/off individually for fine-tuning. The <SPAN CLASS="GUIBUTTON" >Cautious</SPAN > button changes the actions list to low/safe settings which will activate ad blocking and a minimal set of <SPAN CLASS="APPLICATION" >Privoxy</SPAN >'s features, and subsequently there will be less of a chance for accidental problems. The <SPAN CLASS="GUIBUTTON" >Medium</SPAN > button sets the list to a medium level of other features and a low level set of privacy features. The <SPAN CLASS="GUIBUTTON" >Advanced</SPAN > button sets the list to a high level of ad blocking and medium level of privacy. See the chart below. The latter three buttons over-ride any changes via with the <SPAN CLASS="GUIBUTTON" >Edit</SPAN > button. More fine-tuning can be done in the lower sections of this internal page. </P ><P > While the actions file editor allows to enable these settings in all actions files, they are only supposed to be enabled in the first one to make sure you don't unintentionally overrule earlier rules. </P ><P > The default profiles, and their associated actions, as pre-defined in <TT CLASS="FILENAME" >default.action</TT > are: </P ><P > <DIV CLASS="TABLE" ><A NAME="AEN2189" ></A ><P ><B >Table 1. Default Configurations</B ></P ><TABLE BORDER="1" FRAME="border" RULES="all" CLASS="CALSTABLE" ><COL WIDTH="1*" TITLE="C1"><COL WIDTH="1*" TITLE="C2"><COL WIDTH="1*" TITLE="C3"><COL WIDTH="1*" TITLE="C4"><THEAD ><TR ><TH >Feature</TH ><TH >Cautious</TH ><TH >Medium</TH ><TH >Advanced</TH ></TR ></THEAD ><TBODY ><TR ><TD >Ad-blocking Aggressiveness</TD ><TD >medium</TD ><TD >high</TD ><TD >high</TD ></TR ><TR ><TD >Ad-filtering by size</TD ><TD >no</TD ><TD >yes</TD ><TD >yes</TD ></TR ><TR ><TD >Ad-filtering by link</TD ><TD >no</TD ><TD >no</TD ><TD >yes</TD ></TR ><TR ><TD >Pop-up killing</TD ><TD >blocks only</TD ><TD >blocks only</TD ><TD >blocks only</TD ></TR ><TR ><TD >Privacy Features</TD ><TD >low</TD ><TD >medium</TD ><TD >medium/high</TD ></TR ><TR ><TD >Cookie handling</TD ><TD >none</TD ><TD >session-only</TD ><TD >kill</TD ></TR ><TR ><TD >Referer forging</TD ><TD >no</TD ><TD >yes</TD ><TD >yes</TD ></TR ><TR ><TD >GIF de-animation</TD ><TD >no</TD ><TD >yes</TD ><TD >yes</TD ></TR ><TR ><TD >Fast redirects</TD ><TD >no</TD ><TD >no</TD ><TD >yes</TD ></TR ><TR ><TD >HTML taming</TD ><TD >no</TD ><TD >no</TD ><TD >yes</TD ></TR ><TR ><TD >JavaScript taming</TD ><TD >no</TD ><TD >no</TD ><TD >yes</TD ></TR ><TR ><TD >Web-bug killing</TD ><TD >no</TD ><TD >yes</TD ><TD >yes</TD ></TR ><TR ><TD >Image tag reordering</TD ><TD >no</TD ><TD >yes</TD ><TD >yes</TD ></TR ></TBODY ></TABLE ></DIV > </P ></LI ></UL ></P ><P > The list of actions files to be used are defined in the main configuration file, and are processed in the order they are defined (e.g. <TT CLASS="FILENAME" >default.action</TT > is typically processed before <TT CLASS="FILENAME" >user.action</TT >). The content of these can all be viewed and edited from <A HREF="http://config.privoxy.org/show-status" TARGET="_top" >http://config.privoxy.org/show-status</A >. The over-riding principle when applying actions, is that the last action that matches a given URL wins. The broadest, most general rules go first (defined in <TT CLASS="FILENAME" >default.action</TT >), followed by any exceptions (typically also in <TT CLASS="FILENAME" >default.action</TT >), which are then followed lastly by any local preferences (typically in <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >user</I ></SPAN ><TT CLASS="FILENAME" >.action</TT >). Generally, <TT CLASS="FILENAME" >user.action</TT > has the last word. </P ><P > An actions file typically has multiple sections. If you want to use <SPAN CLASS="QUOTE" >"aliases"</SPAN > in an actions file, you have to place the (optional) <A HREF="actions-file.html#ALIASES" >alias section</A > at the top of that file. Then comes the default set of rules which will apply universally to all sites and pages (be <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >very careful</I ></SPAN > with using such a universal set in <TT CLASS="FILENAME" >user.action</TT > or any other actions file after <TT CLASS="FILENAME" >default.action</TT >, because it will override the result from consulting any previous file). And then below that, exceptions to the defined universal policies. You can regard <TT CLASS="FILENAME" >user.action</TT > as an appendix to <TT CLASS="FILENAME" >default.action</TT >, with the advantage that it is a separate file, which makes preserving your personal settings across <SPAN CLASS="APPLICATION" >Privoxy</SPAN > upgrades easier.</P ><P > Actions can be used to block anything you want, including ads, banners, or just some obnoxious URL whose content you would rather not see. Cookies can be accepted or rejected, or accepted only during the current browser session (i.e. not written to disk), content can be modified, some JavaScripts tamed, user-tracking fooled, and much more. See below for a <A HREF="actions-file.html#ACTIONS" >complete list of actions</A >.</P ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="AEN2288" >8.1. Finding the Right Mix</A ></H2 ><P > Note that some <A HREF="actions-file.html#ACTIONS" >actions</A >, like cookie suppression or script disabling, may render some sites unusable that rely on these techniques to work properly. Finding the right mix of actions is not always easy and certainly a matter of personal taste. And, things can always change, requiring refinements in the configuration. In general, it can be said that the more <SPAN CLASS="QUOTE" >"aggressive"</SPAN > your default settings (in the top section of the actions file) are, the more exceptions for <SPAN CLASS="QUOTE" >"trusted"</SPAN > sites you will have to make later. If, for example, you want to crunch all cookies per default, you'll have to make exceptions from that rule for sites that you regularly use and that require cookies for actually useful purposes, like maybe your bank, favorite shop, or newspaper.</P ><P > We have tried to provide you with reasonable rules to start from in the distribution actions files. But there is no general rule of thumb on these things. There just are too many variables, and sites are constantly changing. Sooner or later you will want to change the rules (and read this chapter again :).</P ></DIV ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="AEN2295" >8.2. How to Edit</A ></H2 ><P > The easiest way to edit the actions files is with a browser by using our browser-based editor, which can be reached from <A HREF="http://config.privoxy.org/show-status" TARGET="_top" >http://config.privoxy.org/show-status</A >. Note: the config file option <A HREF="config.html#ENABLE-EDIT-ACTIONS" >enable-edit-actions</A > must be enabled for this to work. The editor allows both fine-grained control over every single feature on a per-URL basis, and easy choosing from wholesale sets of defaults like <SPAN CLASS="QUOTE" >"Cautious"</SPAN >, <SPAN CLASS="QUOTE" >"Medium"</SPAN > or <SPAN CLASS="QUOTE" >"Advanced"</SPAN >. Warning: the <SPAN CLASS="QUOTE" >"Advanced"</SPAN > setting is more aggressive, and will be more likely to cause problems for some sites. Experienced users only! </P ><P > If you prefer plain text editing to GUIs, you can of course also directly edit the the actions files with your favorite text editor. Look at <TT CLASS="FILENAME" >default.action</TT > which is richly commented with many good examples.</P ></DIV ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="ACTIONS-APPLY" >8.3. How Actions are Applied to Requests</A ></H2 ><P > Actions files are divided into sections. There are special sections, like the <SPAN CLASS="QUOTE" >"<A HREF="actions-file.html#ALIASES" >alias</A >"</SPAN > sections which will be discussed later. For now let's concentrate on regular sections: They have a heading line (often split up to multiple lines for readability) which consist of a list of actions, separated by whitespace and enclosed in curly braces. Below that, there is a list of URL and tag patterns, each on a separate line.</P ><P > To determine which actions apply to a request, the URL of the request is compared to all URL patterns in each <SPAN CLASS="QUOTE" >"action file"</SPAN >. Every time it matches, the list of applicable actions for the request is incrementally updated, using the heading of the section in which the pattern is located. The same is done again for tags and tag patterns later on.</P ><P > If multiple applying sections set the same action differently, the last match wins. If not, the effects are aggregated. E.g. a URL might match a regular section with a heading line of <TT CLASS="LITERAL" >{ +<A HREF="actions-file.html#HANDLE-AS-IMAGE" >handle-as-image</A > }</TT >, then later another one with just <TT CLASS="LITERAL" >{ +<A HREF="actions-file.html#BLOCK" >block</A > }</TT >, resulting in <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >both</I ></SPAN > actions to apply. And there may well be cases where you will want to combine actions together. Such a section then might look like:</P ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><PRE CLASS="SCREEN" > { +<TT CLASS="LITERAL" >handle-as-image</TT > +<TT CLASS="LITERAL" >block{Banner ads.}</TT > } # Block these as if they were images. Send no block page. banners.example.com media.example.com/.*banners .example.com/images/ads/</PRE ></TD ></TR ></TABLE > </P ><P > You can trace this process for URL patterns and any given URL by visiting <A HREF="http://config.privoxy.org/show-url-info" TARGET="_top" >http://config.privoxy.org/show-url-info</A >.</P ><P > Examples and more detail on this is provided in the Appendix, <A HREF="appendix.html#ACTIONSANAT" > Troubleshooting: Anatomy of an Action</A > section.</P ></DIV ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="AF-PATTERNS" >8.4. Patterns</A ></H2 ><P > As mentioned, <SPAN CLASS="APPLICATION" >Privoxy</SPAN > uses <SPAN CLASS="QUOTE" >"patterns"</SPAN > to determine what <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >actions</I ></SPAN > might apply to which sites and pages your browser attempts to access. These <SPAN CLASS="QUOTE" >"patterns"</SPAN > use wild card type <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >pattern</I ></SPAN > matching to achieve a high degree of flexibility. This allows one expression to be expanded and potentially match against many similar patterns.</P ><P > Generally, an URL pattern has the form <TT CLASS="LITERAL" ><domain>/<path></TT >, where both the <TT CLASS="LITERAL" ><domain></TT > and <TT CLASS="LITERAL" ><path></TT > are optional. (This is why the special <TT CLASS="LITERAL" >/</TT > pattern matches all URLs). Note that the protocol portion of the URL pattern (e.g. <TT CLASS="LITERAL" >http://</TT >) should <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >not</I ></SPAN > be included in the pattern. This is assumed already!</P ><P > The pattern matching syntax is different for the domain and path parts of the URL. The domain part uses a simple globbing type matching technique, while the path part uses more flexible <A HREF="http://en.wikipedia.org/wiki/Regular_expressions" TARGET="_top" ><SPAN CLASS="QUOTE" >"Regular Expressions"</SPAN ></A > (POSIX 1003.2).</P ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT ><TT CLASS="LITERAL" >www.example.com/</TT ></DT ><DD ><P > is a domain-only pattern and will match any request to <TT CLASS="LITERAL" >www.example.com</TT >, regardless of which document on that server is requested. So ALL pages in this domain would be covered by the scope of this action. Note that a simple <TT CLASS="LITERAL" >example.com</TT > is different and would NOT match. </P ></DD ><DT ><TT CLASS="LITERAL" >www.example.com</TT ></DT ><DD ><P > means exactly the same. For domain-only patterns, the trailing <TT CLASS="LITERAL" >/</TT > may be omitted. </P ></DD ><DT ><TT CLASS="LITERAL" >www.example.com/index.html</TT ></DT ><DD ><P > matches all the documents on <TT CLASS="LITERAL" >www.example.com</TT > whose name starts with <TT CLASS="LITERAL" >/index.html</TT >. </P ></DD ><DT ><TT CLASS="LITERAL" >www.example.com/index.html$</TT ></DT ><DD ><P > matches only the single document <TT CLASS="LITERAL" >/index.html</TT > on <TT CLASS="LITERAL" >www.example.com</TT >. </P ></DD ><DT ><TT CLASS="LITERAL" >/index.html$</TT ></DT ><DD ><P > matches the document <TT CLASS="LITERAL" >/index.html</TT >, regardless of the domain, i.e. on <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >any</I ></SPAN > web server anywhere. </P ></DD ><DT ><TT CLASS="LITERAL" >index.html</TT ></DT ><DD ><P > matches nothing, since it would be interpreted as a domain name and there is no top-level domain called <TT CLASS="LITERAL" >.html</TT >. So its a mistake. </P ></DD ></DL ></DIV ><DIV CLASS="SECT3" ><H3 CLASS="SECT3" ><A NAME="AEN2386" >8.4.1. The Domain Pattern</A ></H3 ><P > The matching of the domain part offers some flexible options: if the domain starts or ends with a dot, it becomes unanchored at that end. For example:</P ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT ><TT CLASS="LITERAL" >.example.com</TT ></DT ><DD ><P > matches any domain with first-level domain <TT CLASS="LITERAL" >com</TT > and second-level domain <TT CLASS="LITERAL" >example</TT >. For example <TT CLASS="LITERAL" >www.example.com</TT >, <TT CLASS="LITERAL" >example.com</TT > and <TT CLASS="LITERAL" >foo.bar.baz.example.com</TT >. Note that it wouldn't match if the second-level domain was <TT CLASS="LITERAL" >another-example</TT >. </P ></DD ><DT ><TT CLASS="LITERAL" >www.</TT ></DT ><DD ><P > matches any domain that <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >STARTS</I ></SPAN > with <TT CLASS="LITERAL" >www.</TT > (It also matches the domain <TT CLASS="LITERAL" >www</TT > but most of the time that doesn't matter.) </P ></DD ><DT ><TT CLASS="LITERAL" >.example.</TT ></DT ><DD ><P > matches any domain that <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >CONTAINS</I ></SPAN > <TT CLASS="LITERAL" >.example.</TT >. And, by the way, also included would be any files or documents that exist within that domain since no path limitations are specified. (Correctly speaking: It matches any FQDN that contains <TT CLASS="LITERAL" >example</TT > as a domain.) This might be <TT CLASS="LITERAL" >www.example.com</TT >, <TT CLASS="LITERAL" >news.example.de</TT >, or <TT CLASS="LITERAL" >www.example.net/cgi/testing.pl</TT > for instance. All these cases are matched. </P ></DD ></DL ></DIV ><P > Additionally, there are wild-cards that you can use in the domain names themselves. These work similarly to shell globbing type wild-cards: <SPAN CLASS="QUOTE" >"*"</SPAN > represents zero or more arbitrary characters (this is equivalent to the <A HREF="http://en.wikipedia.org/wiki/Regular_expressions" TARGET="_top" ><SPAN CLASS="QUOTE" >"Regular Expression"</SPAN ></A > based syntax of <SPAN CLASS="QUOTE" >".*"</SPAN >), <SPAN CLASS="QUOTE" >"?"</SPAN > represents any single character (this is equivalent to the regular expression syntax of a simple <SPAN CLASS="QUOTE" >"."</SPAN >), and you can define <SPAN CLASS="QUOTE" >"character classes"</SPAN > in square brackets which is similar to the same regular expression technique. All of this can be freely mixed:</P ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT ><TT CLASS="LITERAL" >ad*.example.com</TT ></DT ><DD ><P > matches <SPAN CLASS="QUOTE" >"adserver.example.com"</SPAN >, <SPAN CLASS="QUOTE" >"ads.example.com"</SPAN >, etc but not <SPAN CLASS="QUOTE" >"sfads.example.com"</SPAN > </P ></DD ><DT ><TT CLASS="LITERAL" >*ad*.example.com</TT ></DT ><DD ><P > matches all of the above, and then some. </P ></DD ><DT ><TT CLASS="LITERAL" >.?pix.com</TT ></DT ><DD ><P > matches <TT CLASS="LITERAL" >www.ipix.com</TT >, <TT CLASS="LITERAL" >pictures.epix.com</TT >, <TT CLASS="LITERAL" >a.b.c.d.e.upix.com</TT > etc. </P ></DD ><DT ><TT CLASS="LITERAL" >www[1-9a-ez].example.c*</TT ></DT ><DD ><P > matches <TT CLASS="LITERAL" >www1.example.com</TT >, <TT CLASS="LITERAL" >www4.example.cc</TT >, <TT CLASS="LITERAL" >wwwd.example.cy</TT >, <TT CLASS="LITERAL" >wwwz.example.com</TT > etc., but <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >not</I ></SPAN > <TT CLASS="LITERAL" >wwww.example.com</TT >. </P ></DD ></DL ></DIV ><P > While flexible, this is not the sophistication of full regular expression based syntax.</P ></DIV ><DIV CLASS="SECT3" ><H3 CLASS="SECT3" ><A NAME="AEN2462" >8.4.2. The Path Pattern</A ></H3 ><P > <SPAN CLASS="APPLICATION" >Privoxy</SPAN > uses <SPAN CLASS="QUOTE" >"modern"</SPAN > POSIX 1003.2 <A HREF="http://en.wikipedia.org/wiki/Regular_expressions" TARGET="_top" ><SPAN CLASS="QUOTE" >"Regular Expressions"</SPAN ></A > for matching the path portion (after the slash), and is thus more flexible.</P ><P > There is an <A HREF="appendix.html#REGEX" >Appendix</A > with a brief quick-start into regular expressions, you also might want to have a look at your operating system's documentation on regular expressions (try <TT CLASS="LITERAL" >man re_format</TT >).</P ><P > Note that the path pattern is automatically left-anchored at the <SPAN CLASS="QUOTE" >"/"</SPAN >, i.e. it matches as if it would start with a <SPAN CLASS="QUOTE" >"^"</SPAN > (regular expression speak for the beginning of a line).</P ><P > Please also note that matching in the path is <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >CASE INSENSITIVE</I ></SPAN > by default, but you can switch to case sensitive at any point in the pattern by using the <SPAN CLASS="QUOTE" >"(?-i)"</SPAN > switch: <TT CLASS="LITERAL" >www.example.com/(?-i)PaTtErN.*</TT > will match only documents whose path starts with <TT CLASS="LITERAL" >PaTtErN</TT > in <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >exactly</I ></SPAN > this capitalization.</P ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT ><TT CLASS="LITERAL" >.example.com/.*</TT ></DT ><DD ><P > Is equivalent to just <SPAN CLASS="QUOTE" >".example.com"</SPAN >, since any documents within that domain are matched with or without the <SPAN CLASS="QUOTE" >".*"</SPAN > regular expression. This is redundant </P ></DD ><DT ><TT CLASS="LITERAL" >.example.com/.*/index.html$</TT ></DT ><DD ><P > Will match any page in the domain of <SPAN CLASS="QUOTE" >"example.com"</SPAN > that is named <SPAN CLASS="QUOTE" >"index.html"</SPAN >, and that is part of some path. For example, it matches <SPAN CLASS="QUOTE" >"www.example.com/testing/index.html"</SPAN > but NOT <SPAN CLASS="QUOTE" >"www.example.com/index.html"</SPAN > because the regular expression called for at least two <SPAN CLASS="QUOTE" >"/'s"</SPAN >, thus the path requirement. It also would match <SPAN CLASS="QUOTE" >"www.example.com/testing/index_html"</SPAN >, because of the special meta-character <SPAN CLASS="QUOTE" >"."</SPAN >. </P ></DD ><DT ><TT CLASS="LITERAL" >.example.com/(.*/)?index\.html$</TT ></DT ><DD ><P > This regular expression is conditional so it will match any page named <SPAN CLASS="QUOTE" >"index.html"</SPAN > regardless of path which in this case can have one or more <SPAN CLASS="QUOTE" >"/'s"</SPAN >. And this one must contain exactly <SPAN CLASS="QUOTE" >".html"</SPAN > (but does not have to end with that!). </P ></DD ><DT ><TT CLASS="LITERAL" >.example.com/(.*/)(ads|banners?|junk)</TT ></DT ><DD ><P > This regular expression will match any path of <SPAN CLASS="QUOTE" >"example.com"</SPAN > that contains any of the words <SPAN CLASS="QUOTE" >"ads"</SPAN >, <SPAN CLASS="QUOTE" >"banner"</SPAN >, <SPAN CLASS="QUOTE" >"banners"</SPAN > (because of the <SPAN CLASS="QUOTE" >"?"</SPAN >) or <SPAN CLASS="QUOTE" >"junk"</SPAN >. The path does not have to end in these words, just contain them. </P ></DD ><DT ><TT CLASS="LITERAL" >.example.com/(.*/)(ads|banners?|junk)/.*\.(jpe?g|gif|png)$</TT ></DT ><DD ><P > This is very much the same as above, except now it must end in either <SPAN CLASS="QUOTE" >".jpg"</SPAN >, <SPAN CLASS="QUOTE" >".jpeg"</SPAN >, <SPAN CLASS="QUOTE" >".gif"</SPAN > or <SPAN CLASS="QUOTE" >".png"</SPAN >. So this one is limited to common image formats. </P ></DD ></DL ></DIV ><P > There are many, many good examples to be found in <TT CLASS="FILENAME" >default.action</TT >, and more tutorials below in <A HREF="appendix.html#REGEX" >Appendix on regular expressions</A >.</P ></DIV ><DIV CLASS="SECT3" ><H3 CLASS="SECT3" ><A NAME="TAG-PATTERN" >8.4.3. The Tag Pattern</A ></H3 ><P > Tag patterns are used to change the applying actions based on the request's tags. Tags can be created with either the <A HREF="actions-file.html#CLIENT-HEADER-TAGGER" >client-header-tagger</A > or the <A HREF="actions-file.html#SERVER-HEADER-TAGGER" >server-header-tagger</A > action.</P ><P > Tag patterns have to start with <SPAN CLASS="QUOTE" >"TAG:"</SPAN >, so <SPAN CLASS="APPLICATION" >Privoxy</SPAN > can tell them apart from URL patterns. Everything after the colon including white space, is interpreted as a regular expression with path pattern syntax, except that tag patterns aren't left-anchored automatically (<SPAN CLASS="APPLICATION" >Privoxy</SPAN > doesn't silently add a <SPAN CLASS="QUOTE" >"^"</SPAN >, you have to do it yourself if you need it).</P ><P > To match all requests that are tagged with <SPAN CLASS="QUOTE" >"foo"</SPAN > your pattern line should be <SPAN CLASS="QUOTE" >"TAG:^foo$"</SPAN >, <SPAN CLASS="QUOTE" >"TAG:foo"</SPAN > would work as well, but it would also match requests whose tags contain <SPAN CLASS="QUOTE" >"foo"</SPAN > somewhere. <SPAN CLASS="QUOTE" >"TAG: foo"</SPAN > wouldn't work as it requires white space.</P ><P > Sections can contain URL and tag patterns at the same time, but tag patterns are checked after the URL patterns and thus always overrule them, even if they are located before the URL patterns.</P ><P > Once a new tag is added, Privoxy checks right away if it's matched by one of the tag patterns and updates the action settings accordingly. As a result tags can be used to activate other tagger actions, as long as these other taggers look for headers that haven't already be parsed.</P ><P > For example you could tag client requests which use the <TT CLASS="LITERAL" >POST</TT > method, then use this tag to activate another tagger that adds a tag if cookies are sent, and then use a block action based on the cookie tag. This allows the outcome of one action, to be input into a subsequent action. However if you'd reverse the position of the described taggers, and activated the method tagger based on the cookie tagger, no method tags would be created. The method tagger would look for the request line, but at the time the cookie tag is created, the request line has already been parsed.</P ><P > While this is a limitation you should be aware of, this kind of indirection is seldom needed anyway and even the example doesn't make too much sense.</P ></DIV ></DIV ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="ACTIONS" >8.5. Actions</A ></H2 ><P > All actions are disabled by default, until they are explicitly enabled somewhere in an actions file. Actions are turned on if preceded with a <SPAN CLASS="QUOTE" >"+"</SPAN >, and turned off if preceded with a <SPAN CLASS="QUOTE" >"-"</SPAN >. So a <TT CLASS="LITERAL" >+action</TT > means <SPAN CLASS="QUOTE" >"do that action"</SPAN >, e.g. <TT CLASS="LITERAL" >+block</TT > means <SPAN CLASS="QUOTE" >"please block URLs that match the following patterns"</SPAN >, and <TT CLASS="LITERAL" >-block</TT > means <SPAN CLASS="QUOTE" >"don't block URLs that match the following patterns, even if <TT CLASS="LITERAL" >+block</TT > previously applied."</SPAN > </P ><P > Again, actions are invoked by placing them on a line, enclosed in curly braces and separated by whitespace, like in <TT CLASS="LITERAL" >{+some-action -some-other-action{some-parameter}}</TT >, followed by a list of URL patterns, one per line, to which they apply. Together, the actions line and the following pattern lines make up a section of the actions file. </P ><P > Actions fall into three categories:</P ><P > <P ></P ><UL ><LI ><P > Boolean, i.e the action can only be <SPAN CLASS="QUOTE" >"enabled"</SPAN > or <SPAN CLASS="QUOTE" >"disabled"</SPAN >. Syntax: </P ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" > +<TT CLASS="REPLACEABLE" ><I >name</I ></TT > # enable action <TT CLASS="REPLACEABLE" ><I >name</I ></TT > -<TT CLASS="REPLACEABLE" ><I >name</I ></TT > # disable action <TT CLASS="REPLACEABLE" ><I >name</I ></TT ></PRE ></TD ></TR ></TABLE > </P ><P > Example: <TT CLASS="LITERAL" >+handle-as-image</TT > </P ></LI ><LI ><P > Parameterized, where some value is required in order to enable this type of action. Syntax: </P ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" > +<TT CLASS="REPLACEABLE" ><I >name</I ></TT >{<TT CLASS="REPLACEABLE" ><I >param</I ></TT >} # enable action and set parameter to <TT CLASS="REPLACEABLE" ><I >param</I ></TT >, # overwriting parameter from previous match if necessary -<TT CLASS="REPLACEABLE" ><I >name</I ></TT > # disable action. The parameter can be omitted</PRE ></TD ></TR ></TABLE > </P ><P > Note that if the URL matches multiple positive forms of a parameterized action, the last match wins, i.e. the params from earlier matches are simply ignored. </P ><P > Example: <TT CLASS="LITERAL" >+hide-user-agent{Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.8.1.4) Gecko/20070602 Firefox/2.0.0.4}</TT > </P ></LI ><LI ><P > Multi-value. These look exactly like parameterized actions, but they behave differently: If the action applies multiple times to the same URL, but with different parameters, <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >all</I ></SPAN > the parameters from <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >all</I ></SPAN > matches are remembered. This is used for actions that can be executed for the same request repeatedly, like adding multiple headers, or filtering through multiple filters. Syntax: </P ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" > +<TT CLASS="REPLACEABLE" ><I >name</I ></TT >{<TT CLASS="REPLACEABLE" ><I >param</I ></TT >} # enable action and add <TT CLASS="REPLACEABLE" ><I >param</I ></TT > to the list of parameters -<TT CLASS="REPLACEABLE" ><I >name</I ></TT >{<TT CLASS="REPLACEABLE" ><I >param</I ></TT >} # remove the parameter <TT CLASS="REPLACEABLE" ><I >param</I ></TT > from the list of parameters # If it was the last one left, disable the action. <TT CLASS="REPLACEABLE" ><I >-name</I ></TT > # disable this action completely and remove all parameters from the list</PRE ></TD ></TR ></TABLE > </P ><P > Examples: <TT CLASS="LITERAL" >+add-header{X-Fun-Header: Some text}</TT > and <TT CLASS="LITERAL" >+filter{html-annoyances}</TT > </P ></LI ></UL ></P ><P > If nothing is specified in any actions file, no <SPAN CLASS="QUOTE" >"actions"</SPAN > are taken. So in this case <SPAN CLASS="APPLICATION" >Privoxy</SPAN > would just be a normal, non-blocking, non-filtering proxy. You must specifically enable the privacy and blocking features you need (although the provided default actions files will give a good starting point).</P ><P > Later defined action sections always over-ride earlier ones of the same type. So exceptions to any rules you make, should come in the latter part of the file (or in a file that is processed later when using multiple actions files such as <TT CLASS="FILENAME" >user.action</TT >). For multi-valued actions, the actions are applied in the order they are specified. Actions files are processed in the order they are defined in <TT CLASS="FILENAME" >config</TT > (the default installation has three actions files). It also quite possible for any given URL to match more than one <SPAN CLASS="QUOTE" >"pattern"</SPAN > (because of wildcards and regular expressions), and thus to trigger more than one set of actions! Last match wins.</P ><P > The list of valid <SPAN CLASS="APPLICATION" >Privoxy</SPAN > actions are:</P ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="ADD-HEADER" >8.5.1. add-header</A ></H4 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P >Confuse log analysis, custom applications</P ></DD ><DT >Effect:</DT ><DD ><P > Sends a user defined HTTP header to the web server. </P ></DD ><DT >Type:</DT ><DD ><P >Multi-value.</P ></DD ><DT >Parameter:</DT ><DD ><P > Any string value is possible. Validity of the defined HTTP headers is not checked. It is recommended that you use the <SPAN CLASS="QUOTE" >"<TT CLASS="LITERAL" >X-</TT >"</SPAN > prefix for custom headers. </P ></DD ><DT >Notes:</DT ><DD ><P > This action may be specified multiple times, in order to define multiple headers. This is rarely needed for the typical user. If you don't know what <SPAN CLASS="QUOTE" >"HTTP headers"</SPAN > are, you definitely don't need to worry about this one. </P ></DD ><DT >Example usage:</DT ><DD ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+add-header{X-User-Tracking: sucks}</PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="BLOCK" >8.5.2. block</A ></H4 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P >Block ads or other unwanted content</P ></DD ><DT >Effect:</DT ><DD ><P > Requests for URLs to which this action applies are blocked, i.e. the requests are trapped by <SPAN CLASS="APPLICATION" >Privoxy</SPAN > and the requested URL is never retrieved, but is answered locally with a substitute page or image, as determined by the <TT CLASS="LITERAL" ><A HREF="actions-file.html#HANDLE-AS-IMAGE" >handle-as-image</A ></TT >, <TT CLASS="LITERAL" ><A HREF="actions-file.html#SET-IMAGE-BLOCKER" >set-image-blocker</A ></TT >, and <TT CLASS="LITERAL" ><A HREF="actions-file.html#HANDLE-AS-EMPTY-DOCUMENT" >handle-as-empty-document</A ></TT > actions. </P ></DD ><DT >Type:</DT ><DD ><P >Parameterized.</P ></DD ><DT >Parameter:</DT ><DD ><P >A block reason that should be given to the user.</P ></DD ><DT >Notes:</DT ><DD ><P > <SPAN CLASS="APPLICATION" >Privoxy</SPAN > sends a special <SPAN CLASS="QUOTE" >"BLOCKED"</SPAN > page for requests to blocked pages. This page contains the block reason given as parameter, a link to find out why the block action applies, and a click-through to the blocked content (the latter only if the force feature is available and enabled). </P ><P > A very important exception occurs if <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >both</I ></SPAN > <TT CLASS="LITERAL" >block</TT > and <TT CLASS="LITERAL" ><A HREF="actions-file.html#HANDLE-AS-IMAGE" >handle-as-image</A ></TT >, apply to the same request: it will then be replaced by an image. If <TT CLASS="LITERAL" ><A HREF="actions-file.html#SET-IMAGE-BLOCKER" >set-image-blocker</A ></TT > (see below) also applies, the type of image will be determined by its parameter, if not, the standard checkerboard pattern is sent. </P ><P > It is important to understand this process, in order to understand how <SPAN CLASS="APPLICATION" >Privoxy</SPAN > deals with ads and other unwanted content. Blocking is a core feature, and one upon which various other features depend. </P ><P > The <TT CLASS="LITERAL" ><A HREF="actions-file.html#FILTER" >filter</A ></TT > action can perform a very similar task, by <SPAN CLASS="QUOTE" >"blocking"</SPAN > banner images and other content through rewriting the relevant URLs in the document's HTML source, so they don't get requested in the first place. Note that this is a totally different technique, and it's easy to confuse the two. </P ></DD ><DT >Example usage (section):</DT ><DD ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >{+block{No nasty stuff for you.}} # Block and replace with "blocked" page .nasty-stuff.example.com {+block{Doubleclick banners.} +handle-as-image} # Block and replace with image .ad.doubleclick.net .ads.r.us/banners/ {+block{Layered ads.} +handle-as-empty-document} # Block and then ignore adserver.example.net/.*\.js$</PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="CHANGE-X-FORWARDED-FOR" >8.5.3. change-x-forwarded-for</A ></H4 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P >Improve privacy by not forwarding the source of the request in the HTTP headers.</P ></DD ><DT >Effect:</DT ><DD ><P > Deletes the <SPAN CLASS="QUOTE" >"X-Forwarded-For:"</SPAN > HTTP header from the client request, or adds a new one. </P ></DD ><DT >Type:</DT ><DD ><P >Parameterized.</P ></DD ><DT >Parameter:</DT ><DD ><P ></P ><UL ><LI ><P ><SPAN CLASS="QUOTE" >"block"</SPAN > to delete the header.</P ></LI ><LI ><P > <SPAN CLASS="QUOTE" >"add"</SPAN > to create the header (or append the client's IP address to an already existing one). </P ></LI ></UL ></DD ><DT >Notes:</DT ><DD ><P > It is safe and recommended to use <TT CLASS="LITERAL" >block</TT >. </P ><P > Forwarding the source address of the request may make sense in some multi-user setups but is also a privacy risk. </P ></DD ><DT >Example usage:</DT ><DD ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+change-x-forwarded-for{block}</PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="CLIENT-HEADER-FILTER" >8.5.4. client-header-filter</A ></H4 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P > Rewrite or remove single client headers. </P ></DD ><DT >Effect:</DT ><DD ><P > All client headers to which this action applies are filtered on-the-fly through the specified regular expression based substitutions. </P ></DD ><DT >Type:</DT ><DD ><P >Parameterized.</P ></DD ><DT >Parameter:</DT ><DD ><P > The name of a client-header filter, as defined in one of the <A HREF="filter-file.html" >filter files</A >. </P ></DD ><DT >Notes:</DT ><DD ><P > Client-header filters are applied to each header on its own, not to all at once. This makes it easier to diagnose problems, but on the downside you can't write filters that only change header x if header y's value is z. You can do that by using tags though. </P ><P > Client-header filters are executed after the other header actions have finished and use their output as input. </P ><P > If the request URL gets changed, <SPAN CLASS="APPLICATION" >Privoxy</SPAN > will detect that and use the new one. This can be used to rewrite the request destination behind the client's back, for example to specify a Tor exit relay for certain requests. </P ><P > Please refer to the <A HREF="filter-file.html" >filter file chapter</A > to learn which client-header filters are available by default, and how to create your own. </P ></DD ><DT >Example usage (section):</DT ><DD ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" ># Hide Tor exit notation in Host and Referer Headers {+client-header-filter{hide-tor-exit-notation}} / </PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="CLIENT-HEADER-TAGGER" >8.5.5. client-header-tagger</A ></H4 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P > Block requests based on their headers. </P ></DD ><DT >Effect:</DT ><DD ><P > Client headers to which this action applies are filtered on-the-fly through the specified regular expression based substitutions, the result is used as tag. </P ></DD ><DT >Type:</DT ><DD ><P >Parameterized.</P ></DD ><DT >Parameter:</DT ><DD ><P > The name of a client-header tagger, as defined in one of the <A HREF="filter-file.html" >filter files</A >. </P ></DD ><DT >Notes:</DT ><DD ><P > Client-header taggers are applied to each header on its own, and as the header isn't modified, each tagger <SPAN CLASS="QUOTE" >"sees"</SPAN > the original. </P ><P > Client-header taggers are the first actions that are executed and their tags can be used to control every other action. </P ></DD ><DT >Example usage (section):</DT ><DD ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" ># Tag every request with the User-Agent header {+client-header-tagger{user-agent}} / # Tagging itself doesn't change the action # settings, sections with TAG patterns do: # # If it's a download agent, use a different forwarding proxy, # show the real User-Agent and make sure resume works. {+forward-override{forward-socks5 10.0.0.2:2222 .} \ -hide-if-modified-since \ -overwrite-last-modified \ -hide-user-agent \ -filter \ -deanimate-gifs \ } TAG:^User-Agent: NetBSD-ftp/ TAG:^User-Agent: Novell ZYPP Installer TAG:^User-Agent: RPM APT-HTTP/ TAG:^User-Agent: fetch libfetch/ TAG:^User-Agent: Ubuntu APT-HTTP/ TAG:^User-Agent: MPlayer/ </PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="CONTENT-TYPE-OVERWRITE" >8.5.6. content-type-overwrite</A ></H4 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P >Stop useless download menus from popping up, or change the browser's rendering mode</P ></DD ><DT >Effect:</DT ><DD ><P > Replaces the <SPAN CLASS="QUOTE" >"Content-Type:"</SPAN > HTTP server header. </P ></DD ><DT >Type:</DT ><DD ><P >Parameterized.</P ></DD ><DT >Parameter:</DT ><DD ><P > Any string. </P ></DD ><DT >Notes:</DT ><DD ><P > The <SPAN CLASS="QUOTE" >"Content-Type:"</SPAN > HTTP server header is used by the browser to decide what to do with the document. The value of this header can cause the browser to open a download menu instead of displaying the document by itself, even if the document's format is supported by the browser. </P ><P > The declared content type can also affect which rendering mode the browser chooses. If XHTML is delivered as <SPAN CLASS="QUOTE" >"text/html"</SPAN >, many browsers treat it as yet another broken HTML document. If it is send as <SPAN CLASS="QUOTE" >"application/xml"</SPAN >, browsers with XHTML support will only display it, if the syntax is correct. </P ><P > If you see a web site that proudly uses XHTML buttons, but sets <SPAN CLASS="QUOTE" >"Content-Type: text/html"</SPAN >, you can use <SPAN CLASS="APPLICATION" >Privoxy</SPAN > to overwrite it with <SPAN CLASS="QUOTE" >"application/xml"</SPAN > and validate the web master's claim inside your XHTML-supporting browser. If the syntax is incorrect, the browser will complain loudly. </P ><P > You can also go the opposite direction: if your browser prints error messages instead of rendering a document falsely declared as XHTML, you can overwrite the content type with <SPAN CLASS="QUOTE" >"text/html"</SPAN > and have it rendered as broken HTML document. </P ><P > By default <TT CLASS="LITERAL" >content-type-overwrite</TT > only replaces <SPAN CLASS="QUOTE" >"Content-Type:"</SPAN > headers that look like some kind of text. If you want to overwrite it unconditionally, you have to combine it with <TT CLASS="LITERAL" ><A HREF="actions-file.html#FORCE-TEXT-MODE" >force-text-mode</A ></TT >. This limitation exists for a reason, think twice before circumventing it. </P ><P > Most of the time it's easier to replace this action with a custom <TT CLASS="LITERAL" ><A HREF="actions-file.html#SERVER-HEADER-FILTER" >server-header filter</A ></TT >. It allows you to activate it for every document of a certain site and it will still only replace the content types you aimed at. </P ><P > Of course you can apply <TT CLASS="LITERAL" >content-type-overwrite</TT > to a whole site and then make URL based exceptions, but it's a lot more work to get the same precision. </P ></DD ><DT >Example usage (sections):</DT ><DD ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" ># Check if www.example.net/ really uses valid XHTML { +content-type-overwrite{application/xml} } www.example.net/ # but leave the content type unmodified if the URL looks like a style sheet {-content-type-overwrite} www.example.net/.*\.css$ www.example.net/.*style</PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="CRUNCH-CLIENT-HEADER" >8.5.7. crunch-client-header</A ></H4 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P >Remove a client header <SPAN CLASS="APPLICATION" >Privoxy</SPAN > has no dedicated action for.</P ></DD ><DT >Effect:</DT ><DD ><P > Deletes every header sent by the client that contains the string the user supplied as parameter. </P ></DD ><DT >Type:</DT ><DD ><P >Parameterized.</P ></DD ><DT >Parameter:</DT ><DD ><P > Any string. </P ></DD ><DT >Notes:</DT ><DD ><P > This action allows you to block client headers for which no dedicated <SPAN CLASS="APPLICATION" >Privoxy</SPAN > action exists. <SPAN CLASS="APPLICATION" >Privoxy</SPAN > will remove every client header that contains the string you supplied as parameter. </P ><P > Regular expressions are <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >not supported</I ></SPAN > and you can't use this action to block different headers in the same request, unless they contain the same string. </P ><P > <TT CLASS="LITERAL" >crunch-client-header</TT > is only meant for quick tests. If you have to block several different headers, or only want to modify parts of them, you should use a <TT CLASS="LITERAL" ><A HREF="actions-file.html#CLIENT-HEADER-FILTER" >client-header filter</A ></TT >. </P ><DIV CLASS="WARNING" ><P ></P ><TABLE CLASS="WARNING" BORDER="1" WIDTH="90%" ><TR ><TD ALIGN="CENTER" ><B >Warning</B ></TD ></TR ><TR ><TD ALIGN="LEFT" ><P > Don't block any header without understanding the consequences. </P ></TD ></TR ></TABLE ></DIV ></DD ><DT >Example usage (section):</DT ><DD ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" ># Block the non-existent "Privacy-Violation:" client header { +crunch-client-header{Privacy-Violation:} } / </PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="CRUNCH-IF-NONE-MATCH" >8.5.8. crunch-if-none-match</A ></H4 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P >Prevent yet another way to track the user's steps between sessions.</P ></DD ><DT >Effect:</DT ><DD ><P > Deletes the <SPAN CLASS="QUOTE" >"If-None-Match:"</SPAN > HTTP client header. </P ></DD ><DT >Type:</DT ><DD ><P >Boolean.</P ></DD ><DT >Parameter:</DT ><DD ><P > N/A </P ></DD ><DT >Notes:</DT ><DD ><P > Removing the <SPAN CLASS="QUOTE" >"If-None-Match:"</SPAN > HTTP client header is useful for filter testing, where you want to force a real reload instead of getting status code <SPAN CLASS="QUOTE" >"304"</SPAN > which would cause the browser to use a cached copy of the page. </P ><P > It is also useful to make sure the header isn't used as a cookie replacement (unlikely but possible). </P ><P > Blocking the <SPAN CLASS="QUOTE" >"If-None-Match:"</SPAN > header shouldn't cause any caching problems, as long as the <SPAN CLASS="QUOTE" >"If-Modified-Since:"</SPAN > header isn't blocked or missing as well. </P ><P > It is recommended to use this action together with <TT CLASS="LITERAL" ><A HREF="actions-file.html#HIDE-IF-MODIFIED-SINCE" >hide-if-modified-since</A ></TT > and <TT CLASS="LITERAL" ><A HREF="actions-file.html#OVERWRITE-LAST-MODIFIED" >overwrite-last-modified</A ></TT >. </P ></DD ><DT >Example usage (section):</DT ><DD ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" ># Let the browser revalidate cached documents but don't # allow the server to use the revalidation headers for user tracking. {+hide-if-modified-since{-60} \ +overwrite-last-modified{randomize} \ +crunch-if-none-match} / </PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="CRUNCH-INCOMING-COOKIES" >8.5.9. crunch-incoming-cookies</A ></H4 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P > Prevent the web server from setting HTTP cookies on your system </P ></DD ><DT >Effect:</DT ><DD ><P > Deletes any <SPAN CLASS="QUOTE" >"Set-Cookie:"</SPAN > HTTP headers from server replies. </P ></DD ><DT >Type:</DT ><DD ><P >Boolean.</P ></DD ><DT >Parameter:</DT ><DD ><P > N/A </P ></DD ><DT >Notes:</DT ><DD ><P > This action is only concerned with <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >incoming</I ></SPAN > HTTP cookies. For <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >outgoing</I ></SPAN > HTTP cookies, use <TT CLASS="LITERAL" ><A HREF="actions-file.html#CRUNCH-OUTGOING-COOKIES" >crunch-outgoing-cookies</A ></TT >. Use <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >both</I ></SPAN > to disable HTTP cookies completely. </P ><P > It makes <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >no sense at all</I ></SPAN > to use this action in conjunction with the <TT CLASS="LITERAL" ><A HREF="actions-file.html#SESSION-COOKIES-ONLY" >session-cookies-only</A ></TT > action, since it would prevent the session cookies from being set. See also <TT CLASS="LITERAL" ><A HREF="actions-file.html#FILTER-CONTENT-COOKIES" >filter-content-cookies</A ></TT >. </P ></DD ><DT >Example usage:</DT ><DD ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+crunch-incoming-cookies</PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="CRUNCH-SERVER-HEADER" >8.5.10. crunch-server-header</A ></H4 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P >Remove a server header <SPAN CLASS="APPLICATION" >Privoxy</SPAN > has no dedicated action for.</P ></DD ><DT >Effect:</DT ><DD ><P > Deletes every header sent by the server that contains the string the user supplied as parameter. </P ></DD ><DT >Type:</DT ><DD ><P >Parameterized.</P ></DD ><DT >Parameter:</DT ><DD ><P > Any string. </P ></DD ><DT >Notes:</DT ><DD ><P > This action allows you to block server headers for which no dedicated <SPAN CLASS="APPLICATION" >Privoxy</SPAN > action exists. <SPAN CLASS="APPLICATION" >Privoxy</SPAN > will remove every server header that contains the string you supplied as parameter. </P ><P > Regular expressions are <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >not supported</I ></SPAN > and you can't use this action to block different headers in the same request, unless they contain the same string. </P ><P > <TT CLASS="LITERAL" >crunch-server-header</TT > is only meant for quick tests. If you have to block several different headers, or only want to modify parts of them, you should use a custom <TT CLASS="LITERAL" ><A HREF="actions-file.html#SERVER-HEADER-FILTER" >server-header filter</A ></TT >. </P ><DIV CLASS="WARNING" ><P ></P ><TABLE CLASS="WARNING" BORDER="1" WIDTH="90%" ><TR ><TD ALIGN="CENTER" ><B >Warning</B ></TD ></TR ><TR ><TD ALIGN="LEFT" ><P > Don't block any header without understanding the consequences. </P ></TD ></TR ></TABLE ></DIV ></DD ><DT >Example usage (section):</DT ><DD ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" ># Crunch server headers that try to prevent caching { +crunch-server-header{no-cache} } / </PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="CRUNCH-OUTGOING-COOKIES" >8.5.11. crunch-outgoing-cookies</A ></H4 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P > Prevent the web server from reading any HTTP cookies from your system </P ></DD ><DT >Effect:</DT ><DD ><P > Deletes any <SPAN CLASS="QUOTE" >"Cookie:"</SPAN > HTTP headers from client requests. </P ></DD ><DT >Type:</DT ><DD ><P >Boolean.</P ></DD ><DT >Parameter:</DT ><DD ><P > N/A </P ></DD ><DT >Notes:</DT ><DD ><P > This action is only concerned with <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >outgoing</I ></SPAN > HTTP cookies. For <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >incoming</I ></SPAN > HTTP cookies, use <TT CLASS="LITERAL" ><A HREF="actions-file.html#CRUNCH-INCOMING-COOKIES" >crunch-incoming-cookies</A ></TT >. Use <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >both</I ></SPAN > to disable HTTP cookies completely. </P ><P > It makes <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >no sense at all</I ></SPAN > to use this action in conjunction with the <TT CLASS="LITERAL" ><A HREF="actions-file.html#SESSION-COOKIES-ONLY" >session-cookies-only</A ></TT > action, since it would prevent the session cookies from being read. </P ></DD ><DT >Example usage:</DT ><DD ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+crunch-outgoing-cookies</PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="DEANIMATE-GIFS" >8.5.12. deanimate-gifs</A ></H4 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P >Stop those annoying, distracting animated GIF images.</P ></DD ><DT >Effect:</DT ><DD ><P > De-animate GIF animations, i.e. reduce them to their first or last image. </P ></DD ><DT >Type:</DT ><DD ><P >Parameterized.</P ></DD ><DT >Parameter:</DT ><DD ><P > <SPAN CLASS="QUOTE" >"last"</SPAN > or <SPAN CLASS="QUOTE" >"first"</SPAN > </P ></DD ><DT >Notes:</DT ><DD ><P > This will also shrink the images considerably (in bytes, not pixels!). If the option <SPAN CLASS="QUOTE" >"first"</SPAN > is given, the first frame of the animation is used as the replacement. If <SPAN CLASS="QUOTE" >"last"</SPAN > is given, the last frame of the animation is used instead, which probably makes more sense for most banner animations, but also has the risk of not showing the entire last frame (if it is only a delta to an earlier frame). </P ><P > You can safely use this action with patterns that will also match non-GIF objects, because no attempt will be made at anything that doesn't look like a GIF. </P ></DD ><DT >Example usage:</DT ><DD ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+deanimate-gifs{last}</PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="DOWNGRADE-HTTP-VERSION" >8.5.13. downgrade-http-version</A ></H4 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P >Work around (very rare) problems with HTTP/1.1</P ></DD ><DT >Effect:</DT ><DD ><P > Downgrades HTTP/1.1 client requests and server replies to HTTP/1.0. </P ></DD ><DT >Type:</DT ><DD ><P >Boolean.</P ></DD ><DT >Parameter:</DT ><DD ><P > N/A </P ></DD ><DT >Notes:</DT ><DD ><P > This is a left-over from the time when <SPAN CLASS="APPLICATION" >Privoxy</SPAN > didn't support important HTTP/1.1 features well. It is left here for the unlikely case that you experience HTTP/1.1 related problems with some server out there. Not all HTTP/1.1 features and requirements are supported yet, so there is a chance you might need this action. </P ></DD ><DT >Example usage (section):</DT ><DD ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >{+downgrade-http-version} problem-host.example.com</PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="FAST-REDIRECTS" >8.5.14. fast-redirects</A ></H4 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P >Fool some click-tracking scripts and speed up indirect links.</P ></DD ><DT >Effect:</DT ><DD ><P > Detects redirection URLs and redirects the browser without contacting the redirection server first. </P ></DD ><DT >Type:</DT ><DD ><P >Parameterized.</P ></DD ><DT >Parameter:</DT ><DD ><P ></P ><UL ><LI ><P > <SPAN CLASS="QUOTE" >"simple-check"</SPAN > to just search for the string <SPAN CLASS="QUOTE" >"http://"</SPAN > to detect redirection URLs. </P ></LI ><LI ><P > <SPAN CLASS="QUOTE" >"check-decoded-url"</SPAN > to decode URLs (if necessary) before searching for redirection URLs. </P ></LI ></UL ></DD ><DT >Notes:</DT ><DD ><P > Many sites, like yahoo.com, don't just link to other sites. Instead, they will link to some script on their own servers, giving the destination as a parameter, which will then redirect you to the final target. URLs resulting from this scheme typically look like: <SPAN CLASS="QUOTE" >"http://www.example.org/click-tracker.cgi?target=http%3a//www.example.net/"</SPAN >. </P ><P > Sometimes, there are even multiple consecutive redirects encoded in the URL. These redirections via scripts make your web browsing more traceable, since the server from which you follow such a link can see where you go to. Apart from that, valuable bandwidth and time is wasted, while your browser asks the server for one redirect after the other. Plus, it feeds the advertisers. </P ><P > This feature is currently not very smart and is scheduled for improvement. If it is enabled by default, you will have to create some exceptions to this action. It can lead to failures in several ways: </P ><P > Not every URLs with other URLs as parameters is evil. Some sites offer a real service that requires this information to work. For example a validation service needs to know, which document to validate. <TT CLASS="LITERAL" >fast-redirects</TT > assumes that every URL parameter that looks like another URL is a redirection target, and will always redirect to the last one. Most of the time the assumption is correct, but if it isn't, the user gets redirected anyway. </P ><P > Another failure occurs if the URL contains other parameters after the URL parameter. The URL: <SPAN CLASS="QUOTE" >"http://www.example.org/?redirect=http%3a//www.example.net/&foo=bar"</SPAN >. contains the redirection URL <SPAN CLASS="QUOTE" >"http://www.example.net/"</SPAN >, followed by another parameter. <TT CLASS="LITERAL" >fast-redirects</TT > doesn't know that and will cause a redirect to <SPAN CLASS="QUOTE" >"http://www.example.net/&foo=bar"</SPAN >. Depending on the target server configuration, the parameter will be silently ignored or lead to a <SPAN CLASS="QUOTE" >"page not found"</SPAN > error. You can prevent this problem by first using the <TT CLASS="LITERAL" ><A HREF="actions-file.html#REDIRECT" >redirect</A ></TT > action to remove the last part of the URL, but it requires a little effort. </P ><P > To detect a redirection URL, <TT CLASS="LITERAL" >fast-redirects</TT > only looks for the string <SPAN CLASS="QUOTE" >"http://"</SPAN >, either in plain text (invalid but often used) or encoded as <SPAN CLASS="QUOTE" >"http%3a//"</SPAN >. Some sites use their own URL encoding scheme, encrypt the address of the target server or replace it with a database id. In theses cases <TT CLASS="LITERAL" >fast-redirects</TT > is fooled and the request reaches the redirection server where it probably gets logged. </P ></DD ><DT >Example usage:</DT ><DD ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" > { +fast-redirects{simple-check} } one.example.com { +fast-redirects{check-decoded-url} } another.example.com/testing</PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="FILTER" >8.5.15. filter</A ></H4 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P >Get rid of HTML and JavaScript annoyances, banner advertisements (by size), do fun text replacements, add personalized effects, etc.</P ></DD ><DT >Effect:</DT ><DD ><P > All instances of text-based type, most notably HTML and JavaScript, to which this action applies, can be filtered on-the-fly through the specified regular expression based substitutions. (Note: as of version 3.0.3 plain text documents are exempted from filtering, because web servers often use the <TT CLASS="LITERAL" >text/plain</TT > MIME type for all files whose type they don't know.) </P ></DD ><DT >Type:</DT ><DD ><P >Parameterized.</P ></DD ><DT >Parameter:</DT ><DD ><P > The name of a content filter, as defined in the <A HREF="filter-file.html" >filter file</A >. Filters can be defined in one or more files as defined by the <TT CLASS="LITERAL" ><A HREF="config.html#FILTERFILE" >filterfile</A ></TT > option in the <A HREF="config.html" >config file</A >. <TT CLASS="FILENAME" >default.filter</TT > is the collection of filters supplied by the developers. Locally defined filters should go in their own file, such as <TT CLASS="FILENAME" >user.filter</TT >. </P ><P > When used in its negative form, and without parameters, <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >all</I ></SPAN > filtering is completely disabled. </P ></DD ><DT >Notes:</DT ><DD ><P > 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. </P ><P > Filtering requires buffering the page content, which may appear to slow down page rendering since nothing is displayed until all content has passed the filters. (It does not really take longer, but seems that way since the page is not incrementally displayed.) This effect will be more noticeable on slower connections. </P ><P > <SPAN CLASS="QUOTE" >"Rolling your own"</SPAN > filters requires a knowledge of <A HREF="http://en.wikipedia.org/wiki/Regular_expressions" TARGET="_top" ><SPAN CLASS="QUOTE" >"Regular Expressions"</SPAN ></A > and <A HREF="http://en.wikipedia.org/wiki/Html" TARGET="_top" ><SPAN CLASS="QUOTE" >"HTML"</SPAN ></A >. This is very powerful feature, and potentially very intrusive. Filters should be used with caution, and where an equivalent <SPAN CLASS="QUOTE" >"action"</SPAN > is not available. </P ><P > The amount of data that can be filtered is limited to the <TT CLASS="LITERAL" ><A HREF="config.html#BUFFER-LIMIT" >buffer-limit</A ></TT > option in the main <A HREF="config.html" >config file</A >. The default is 4096 KB (4 Megs). Once this limit is exceeded, the buffered data, and all pending data, is passed through unfiltered. </P ><P > Inappropriate MIME types, such as zipped files, are not filtered at all. (Again, only text-based types except plain text). Encrypted SSL data (from HTTPS servers) cannot be filtered either, since this would violate the integrity of the secure transaction. In some situations it might be necessary to protect certain text, like source code, from filtering by defining appropriate <TT CLASS="LITERAL" >-filter</TT > exceptions. </P ><P > Compressed content can't be filtered either, unless <SPAN CLASS="APPLICATION" >Privoxy</SPAN > is compiled with zlib support (requires at least <SPAN CLASS="APPLICATION" >Privoxy</SPAN > 3.0.7), in which case <SPAN CLASS="APPLICATION" >Privoxy</SPAN > will decompress the content before filtering it. </P ><P > If you use a <SPAN CLASS="APPLICATION" >Privoxy</SPAN > version without zlib support, but want filtering to work on as much documents as possible, even those that would normally be sent compressed, you must use the <TT CLASS="LITERAL" ><A HREF="actions-file.html#PREVENT-COMPRESSION" >prevent-compression</A ></TT > action in conjunction with <TT CLASS="LITERAL" >filter</TT >. </P ><P > Content filtering can achieve some of the same effects as the <TT CLASS="LITERAL" ><A HREF="actions-file.html#BLOCK" >block</A ></TT > 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. </P ><P > <A HREF="contact.html" >Feedback</A > with suggestions for new or improved filters is particularly welcome! </P ><P > The below list has only the names and a one-line description of each predefined filter. There are <A HREF="filter-file.html#PREDEFINED-FILTERS" >more verbose explanations</A > of what these filters do in the <A HREF="filter-file.html" >filter file chapter</A >. </P ></DD ><DT >Example usage (with filters from the distribution <TT CLASS="FILENAME" >default.filter</TT > file). See <A HREF="filter-file.html#PREDEFINED-FILTERS" >the Predefined Filters section</A > for more explanation on each:</DT ><DD ><P > <A NAME="FILTER-JS-ANNOYANCES" ></A > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+filter{js-annoyances} # Get rid of particularly annoying JavaScript abuse.</PRE ></TD ></TR ></TABLE > </P ><P > <A NAME="FILTER-JS-EVENTS" ></A > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+filter{js-events} # Kill all JS event bindings and timers (Radically destructive! Only for extra nasty sites).</PRE ></TD ></TR ></TABLE > </P ><P > <A NAME="FILTER-HTML-ANNOYANCES" ></A > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+filter{html-annoyances} # Get rid of particularly annoying HTML abuse.</PRE ></TD ></TR ></TABLE > </P ><P > <A NAME="FILTER-CONTENT-COOKIES" ></A > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+filter{content-cookies} # Kill cookies that come in the HTML or JS content.</PRE ></TD ></TR ></TABLE > </P ><P > <A NAME="FILTER-REFRESH-TAGS" ></A > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+filter{refresh-tags} # Kill automatic refresh tags (for dial-on-demand setups).</PRE ></TD ></TR ></TABLE > </P ><P > <A NAME="FILTER-UNSOLICITED-POPUPS" ></A > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+filter{unsolicited-popups} # Disable only unsolicited pop-up windows. Useful if your browser lacks this ability.</PRE ></TD ></TR ></TABLE > </P ><P > <A NAME="FILTER-ALL-POPUPS" ></A > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+filter{all-popups} # Kill all popups in JavaScript and HTML. Useful if your browser lacks this ability.</PRE ></TD ></TR ></TABLE > </P ><P > <A NAME="FILTER-IMG-REORDER" ></A > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+filter{img-reorder} # Reorder attributes in <img> tags to make the banners-by-* filters more effective.</PRE ></TD ></TR ></TABLE > </P ><P > <A NAME="FILTER-BANNERS-BY-SIZE" ></A > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+filter{banners-by-size} # Kill banners by size.</PRE ></TD ></TR ></TABLE > </P ><P > <A NAME="FILTER-BANNERS-BY-LINK" ></A > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+filter{banners-by-link} # Kill banners by their links to known clicktrackers.</PRE ></TD ></TR ></TABLE > </P ><P > <A NAME="FILTER-WEBBUGS" ></A > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+filter{webbugs} # Squish WebBugs (1x1 invisible GIFs used for user tracking).</PRE ></TD ></TR ></TABLE > </P ><P > <A NAME="FILTER-TINY-TEXTFORMS" ></A > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+filter{tiny-textforms} # Extend those tiny textareas up to 40x80 and kill the hard wrap.</PRE ></TD ></TR ></TABLE > </P ><P > <A NAME="FILTER-JUMPING-WINDOWS" ></A > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+filter{jumping-windows} # Prevent windows from resizing and moving themselves.</PRE ></TD ></TR ></TABLE > </P ><P > <A NAME="FILTER-FRAMESET-BORDERS" ></A > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+filter{frameset-borders} # Give frames a border and make them resizable.</PRE ></TD ></TR ></TABLE > </P ><P > <A NAME="FILTER-DEMORONIZER" ></A > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+filter{demoronizer} # Fix MS's non-standard use of standard charsets.</PRE ></TD ></TR ></TABLE > </P ><P > <A NAME="FILTER-SHOCKWAVE-FLASH" ></A > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+filter{shockwave-flash} # Kill embedded Shockwave Flash objects.</PRE ></TD ></TR ></TABLE > </P ><P > <A NAME="FILTER-QUICKTIME-KIOSKMODE" ></A > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+filter{quicktime-kioskmode} # Make Quicktime movies saveable.</PRE ></TD ></TR ></TABLE > </P ><P > <A NAME="FILTER-FUN" ></A > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+filter{fun} # Text replacements for subversive browsing fun!</PRE ></TD ></TR ></TABLE > </P ><P > <A NAME="FILTER-CRUDE-PARENTAL" ></A > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+filter{crude-parental} # Crude parental filtering. Note that this filter doesn't work reliably.</PRE ></TD ></TR ></TABLE > </P ><P > <A NAME="FILTER-IE-EXPLOITS" ></A > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+filter{ie-exploits} # Disable some known Internet Explorer bug exploits.</PRE ></TD ></TR ></TABLE > </P ><P > <A NAME="FILTER-SITE-SPECIFICS" ></A > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+filter{site-specifics} # Cure for site-specific problems. Don't apply generally!</PRE ></TD ></TR ></TABLE > </P ><P > <A NAME="FILTER-NO-PING" ></A > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+filter{no-ping} # Removes non-standard ping attributes in <a> and <area> tags.</PRE ></TD ></TR ></TABLE > </P ><P > <A NAME="FILTER-GOOGLE" ></A > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+filter{google} # CSS-based block for Google text ads. Also removes a width limitation and the toolbar advertisement.</PRE ></TD ></TR ></TABLE > </P ><P > <A NAME="FILTER-YAHOO" ></A > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+filter{yahoo} # CSS-based block for Yahoo text ads. Also removes a width limitation.</PRE ></TD ></TR ></TABLE > </P ><P > <A NAME="FILTER-MSN" ></A > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+filter{msn} # CSS-based block for MSN text ads. Also removes tracking URLs and a width limitation.</PRE ></TD ></TR ></TABLE > </P ><P > <A NAME="FILTER-BLOGSPOT" ></A > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+filter{blogspot} # Cleans up some Blogspot blogs. Read the fine print before using this.</PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="FORCE-TEXT-MODE" >8.5.16. force-text-mode</A ></H4 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P >Force <SPAN CLASS="APPLICATION" >Privoxy</SPAN > to treat a document as if it was in some kind of <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >text</I ></SPAN > format. </P ></DD ><DT >Effect:</DT ><DD ><P > Declares a document as text, even if the <SPAN CLASS="QUOTE" >"Content-Type:"</SPAN > isn't detected as such. </P ></DD ><DT >Type:</DT ><DD ><P >Boolean.</P ></DD ><DT >Parameter:</DT ><DD ><P > N/A </P ></DD ><DT >Notes:</DT ><DD ><P > As explained <TT CLASS="LITERAL" ><A HREF="actions-file.html#FILTER" >above</A ></TT >, <SPAN CLASS="APPLICATION" >Privoxy</SPAN > tries to only filter files that are in some kind of text format. The same restrictions apply to <TT CLASS="LITERAL" ><A HREF="actions-file.html#CONTENT-TYPE-OVERWRITE" >content-type-overwrite</A ></TT >. <TT CLASS="LITERAL" >force-text-mode</TT > declares a document as text, without looking at the <SPAN CLASS="QUOTE" >"Content-Type:"</SPAN > first. </P ><DIV CLASS="WARNING" ><P ></P ><TABLE CLASS="WARNING" BORDER="1" WIDTH="90%" ><TR ><TD ALIGN="CENTER" ><B >Warning</B ></TD ></TR ><TR ><TD ALIGN="LEFT" ><P > Think twice before activating this action. Filtering binary data with regular expressions can cause file damage. </P ></TD ></TR ></TABLE ></DIV ></DD ><DT >Example usage:</DT ><DD ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+force-text-mode </PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="FORWARD-OVERRIDE" >8.5.17. forward-override</A ></H4 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P >Change the forwarding settings based on User-Agent or request origin</P ></DD ><DT >Effect:</DT ><DD ><P > Overrules the forward directives in the configuration file. </P ></DD ><DT >Type:</DT ><DD ><P >Multi-value.</P ></DD ><DT >Parameter:</DT ><DD ><P ></P ><UL ><LI ><P ><SPAN CLASS="QUOTE" >"forward ."</SPAN > to use a direct connection without any additional proxies.</P ></LI ><LI ><P > <SPAN CLASS="QUOTE" >"forward 127.0.0.1:8123"</SPAN > to use the HTTP proxy listening at 127.0.0.1 port 8123. </P ></LI ><LI ><P > <SPAN CLASS="QUOTE" >"forward-socks4a 127.0.0.1:9050 ."</SPAN > to use the socks4a proxy listening at 127.0.0.1 port 9050. Replace <SPAN CLASS="QUOTE" >"forward-socks4a"</SPAN > with <SPAN CLASS="QUOTE" >"forward-socks4"</SPAN > to use a socks4 connection (with local DNS resolution) instead, use <SPAN CLASS="QUOTE" >"forward-socks5"</SPAN > for socks5 connections (with remote DNS resolution). </P ></LI ><LI ><P > <SPAN CLASS="QUOTE" >"forward-socks4a 127.0.0.1:9050 proxy.example.org:8000"</SPAN > to use the socks4a proxy listening at 127.0.0.1 port 9050 to reach the HTTP proxy listening at proxy.example.org port 8000. Replace <SPAN CLASS="QUOTE" >"forward-socks4a"</SPAN > with <SPAN CLASS="QUOTE" >"forward-socks4"</SPAN > to use a socks4 connection (with local DNS resolution) instead, use <SPAN CLASS="QUOTE" >"forward-socks5"</SPAN > for socks5 connections (with remote DNS resolution). </P ></LI ></UL ></DD ><DT >Notes:</DT ><DD ><P > This action takes parameters similar to the <A HREF="config.html#FORWARDING" >forward</A > directives in the configuration file, but without the URL pattern. It can be used as replacement, but normally it's only used in cases where matching based on the request URL isn't sufficient. </P ><DIV CLASS="WARNING" ><P ></P ><TABLE CLASS="WARNING" BORDER="1" WIDTH="90%" ><TR ><TD ALIGN="CENTER" ><B >Warning</B ></TD ></TR ><TR ><TD ALIGN="LEFT" ><P > Please read the description for the <A HREF="config.html#FORWARDING" >forward</A > directives before using this action. Forwarding to the wrong people will reduce your privacy and increase the chances of man-in-the-middle attacks. </P ><P > If the ports are missing or invalid, default values will be used. This might change in the future and you shouldn't rely on it. Otherwise incorrect syntax causes Privoxy to exit. </P ><P > Use the <A HREF="http://config.privoxy.org/show-url-info" TARGET="_top" >show-url-info CGI page</A > to verify that your forward settings do what you thought the do. </P ></TD ></TR ></TABLE ></DIV ></DD ><DT >Example usage:</DT ><DD ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" ># Always use direct connections for requests previously tagged as # <SPAN CLASS="QUOTE" >"User-Agent: fetch libfetch/2.0"</SPAN > and make sure # resuming downloads continues to work. # This way you can continue to use Tor for your normal browsing, # without overloading the Tor network with your FreeBSD ports updates # or downloads of bigger files like ISOs. # Note that HTTP headers are easy to fake and therefore their # values are as (un)trustworthy as your clients and users. {+forward-override{forward .} \ -hide-if-modified-since \ -overwrite-last-modified \ } TAG:^User-Agent: fetch libfetch/2\.0$ </PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="HANDLE-AS-EMPTY-DOCUMENT" >8.5.18. handle-as-empty-document</A ></H4 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P >Mark URLs that should be replaced by empty documents <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >if they get blocked</I ></SPAN ></P ></DD ><DT >Effect:</DT ><DD ><P > This action alone doesn't do anything noticeable. It just marks URLs. If the <TT CLASS="LITERAL" ><A HREF="actions-file.html#BLOCK" >block</A ></TT > action <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >also applies</I ></SPAN >, the presence or absence of this mark decides whether an HTML <SPAN CLASS="QUOTE" >"BLOCKED"</SPAN > page, or an empty document will be sent to the client as a substitute for the blocked content. The <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >empty</I ></SPAN > document isn't literally empty, but actually contains a single space. </P ></DD ><DT >Type:</DT ><DD ><P >Boolean.</P ></DD ><DT >Parameter:</DT ><DD ><P > N/A </P ></DD ><DT >Notes:</DT ><DD ><P > Some browsers complain about syntax errors if JavaScript documents are blocked with <SPAN CLASS="APPLICATION" >Privoxy's</SPAN > default HTML page; this option can be used to silence them. And of course this action can also be used to eliminate the <SPAN CLASS="APPLICATION" >Privoxy</SPAN > BLOCKED message in frames. </P ><P > The content type for the empty document can be specified with <TT CLASS="LITERAL" ><A HREF="actions-file.html#CONTENT-TYPE-OVERWRITE" >content-type-overwrite{}</A ></TT >, but usually this isn't necessary. </P ></DD ><DT >Example usage:</DT ><DD ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" ># Block all documents on example.org that end with ".js", # but send an empty document instead of the usual HTML message. {+block{Blocked JavaScript} +handle-as-empty-document} example.org/.*\.js$ </PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="HANDLE-AS-IMAGE" >8.5.19. handle-as-image</A ></H4 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P >Mark URLs as belonging to images (so they'll be replaced by images <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >if they do get blocked</I ></SPAN >, rather than HTML pages)</P ></DD ><DT >Effect:</DT ><DD ><P > This action alone doesn't do anything noticeable. It just marks URLs as images. If the <TT CLASS="LITERAL" ><A HREF="actions-file.html#BLOCK" >block</A ></TT > action <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >also applies</I ></SPAN >, the presence or absence of this mark decides whether an HTML <SPAN CLASS="QUOTE" >"blocked"</SPAN > page, or a replacement image (as determined by the <TT CLASS="LITERAL" ><A HREF="actions-file.html#SET-IMAGE-BLOCKER" >set-image-blocker</A ></TT > action) will be sent to the client as a substitute for the blocked content. </P ></DD ><DT >Type:</DT ><DD ><P >Boolean.</P ></DD ><DT >Parameter:</DT ><DD ><P > N/A </P ></DD ><DT >Notes:</DT ><DD ><P > The below generic example section is actually part of <TT CLASS="FILENAME" >default.action</TT >. It marks all URLs with well-known image file name extensions as images and should be left intact. </P ><P > Users will probably only want to use the handle-as-image action in conjunction with <TT CLASS="LITERAL" ><A HREF="actions-file.html#BLOCK" >block</A ></TT >, to block sources of banners, whose URLs don't reflect the file type, like in the second example section. </P ><P > Note that you cannot treat HTML pages as images in most cases. For instance, (in-line) ad frames require an HTML page to be sent, or they won't display properly. Forcing <TT CLASS="LITERAL" >handle-as-image</TT > in this situation will not replace the ad frame with an image, but lead to error messages. </P ></DD ><DT >Example usage (sections):</DT ><DD ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" ># Generic image extensions: # {+handle-as-image} /.*\.(gif|jpg|jpeg|png|bmp|ico)$ # These don't look like images, but they're banners and should be # blocked as images: # {+block{Nasty banners.} +handle-as-image} nasty-banner-server.example.com/junk.cgi\?output=trash</PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="HIDE-ACCEPT-LANGUAGE" >8.5.20. hide-accept-language</A ></H4 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P >Pretend to use different language settings.</P ></DD ><DT >Effect:</DT ><DD ><P > Deletes or replaces the <SPAN CLASS="QUOTE" >"Accept-Language:"</SPAN > HTTP header in client requests. </P ></DD ><DT >Type:</DT ><DD ><P >Parameterized.</P ></DD ><DT >Parameter:</DT ><DD ><P > Keyword: <SPAN CLASS="QUOTE" >"block"</SPAN >, or any user defined value. </P ></DD ><DT >Notes:</DT ><DD ><P > Faking the browser's language settings can be useful to make a foreign User-Agent set with <TT CLASS="LITERAL" ><A HREF="actions-file.html#HIDE-USER-AGENT" >hide-user-agent</A ></TT > more believable. </P ><P > However some sites with content in different languages check the <SPAN CLASS="QUOTE" >"Accept-Language:"</SPAN > to decide which one to take by default. Sometimes it isn't possible to later switch to another language without changing the <SPAN CLASS="QUOTE" >"Accept-Language:"</SPAN > header first. </P ><P > Therefore it's a good idea to either only change the <SPAN CLASS="QUOTE" >"Accept-Language:"</SPAN > header to languages you understand, or to languages that aren't wide spread. </P ><P > Before setting the <SPAN CLASS="QUOTE" >"Accept-Language:"</SPAN > header to a rare language, you should consider that it helps to make your requests unique and thus easier to trace. If you don't plan to change this header frequently, you should stick to a common language. </P ></DD ><DT >Example usage (section):</DT ><DD ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" ># Pretend to use Canadian language settings. {+hide-accept-language{en-ca} \ +hide-user-agent{Mozilla/5.0 (X11; U; OpenBSD i386; en-CA; rv:1.8.0.4) Gecko/20060628 Firefox/1.5.0.4} \ } / </PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="HIDE-CONTENT-DISPOSITION" >8.5.21. hide-content-disposition</A ></H4 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P >Prevent download menus for content you prefer to view inside the browser.</P ></DD ><DT >Effect:</DT ><DD ><P > Deletes or replaces the <SPAN CLASS="QUOTE" >"Content-Disposition:"</SPAN > HTTP header set by some servers. </P ></DD ><DT >Type:</DT ><DD ><P >Parameterized.</P ></DD ><DT >Parameter:</DT ><DD ><P > Keyword: <SPAN CLASS="QUOTE" >"block"</SPAN >, or any user defined value. </P ></DD ><DT >Notes:</DT ><DD ><P > Some servers set the <SPAN CLASS="QUOTE" >"Content-Disposition:"</SPAN > HTTP header for documents they assume you want to save locally before viewing them. The <SPAN CLASS="QUOTE" >"Content-Disposition:"</SPAN > header contains the file name the browser is supposed to use by default. </P ><P > In most browsers that understand this header, it makes it impossible to <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >just view</I ></SPAN > the document, without downloading it first, even if it's just a simple text file or an image. </P ><P > Removing the <SPAN CLASS="QUOTE" >"Content-Disposition:"</SPAN > header helps to prevent this annoyance, but some browsers additionally check the <SPAN CLASS="QUOTE" >"Content-Type:"</SPAN > header, before they decide if they can display a document without saving it first. In these cases, you have to change this header as well, before the browser stops displaying download menus. </P ><P > It is also possible to change the server's file name suggestion to another one, but in most cases it isn't worth the time to set it up. </P ><P > This action will probably be removed in the future, use server-header filters instead. </P ></DD ><DT >Example usage:</DT ><DD ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" ># Disarm the download link in Sourceforge's patch tracker { -filter \ +content-type-overwrite{text/plain}\ +hide-content-disposition{block} } .sourceforge.net/tracker/download\.php</PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="HIDE-IF-MODIFIED-SINCE" >8.5.22. hide-if-modified-since</A ></H4 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P >Prevent yet another way to track the user's steps between sessions.</P ></DD ><DT >Effect:</DT ><DD ><P > Deletes the <SPAN CLASS="QUOTE" >"If-Modified-Since:"</SPAN > HTTP client header or modifies its value. </P ></DD ><DT >Type:</DT ><DD ><P >Parameterized.</P ></DD ><DT >Parameter:</DT ><DD ><P > Keyword: <SPAN CLASS="QUOTE" >"block"</SPAN >, or a user defined value that specifies a range of hours. </P ></DD ><DT >Notes:</DT ><DD ><P > Removing this header is useful for filter testing, where you want to force a real reload instead of getting status code <SPAN CLASS="QUOTE" >"304"</SPAN >, which would cause the browser to use a cached copy of the page. </P ><P > Instead of removing the header, <TT CLASS="LITERAL" >hide-if-modified-since</TT > can also add or subtract a random amount of time to/from the header's value. You specify a range of minutes where the random factor should be chosen from and <SPAN CLASS="APPLICATION" >Privoxy</SPAN > does the rest. A negative value means subtracting, a positive value adding. </P ><P > Randomizing the value of the <SPAN CLASS="QUOTE" >"If-Modified-Since:"</SPAN > makes it less likely that the server can use the time as a cookie replacement, but you will run into caching problems if the random range is too high. </P ><P > It is a good idea to only use a small negative value and let <TT CLASS="LITERAL" ><A HREF="actions-file.html#OVERWRITE-LAST-MODIFIED" >overwrite-last-modified</A ></TT > handle the greater changes. </P ><P > It is also recommended to use this action together with <TT CLASS="LITERAL" ><A HREF="actions-file.html#CRUNCH-IF-NONE-MATCH" >crunch-if-none-match</A ></TT >, otherwise it's more or less pointless. </P ></DD ><DT >Example usage (section):</DT ><DD ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" ># Let the browser revalidate but make tracking based on the time less likely. {+hide-if-modified-since{-60} \ +overwrite-last-modified{randomize} \ +crunch-if-none-match} /</PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="HIDE-FROM-HEADER" >8.5.23. hide-from-header</A ></H4 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P >Keep your (old and ill) browser from telling web servers your email address</P ></DD ><DT >Effect:</DT ><DD ><P > Deletes any existing <SPAN CLASS="QUOTE" >"From:"</SPAN > HTTP header, or replaces it with the specified string. </P ></DD ><DT >Type:</DT ><DD ><P >Parameterized.</P ></DD ><DT >Parameter:</DT ><DD ><P > Keyword: <SPAN CLASS="QUOTE" >"block"</SPAN >, or any user defined value. </P ></DD ><DT >Notes:</DT ><DD ><P > The keyword <SPAN CLASS="QUOTE" >"block"</SPAN > will completely remove the header (not to be confused with the <TT CLASS="LITERAL" ><A HREF="actions-file.html#BLOCK" >block</A ></TT > action). </P ><P > Alternately, you can specify any value you prefer to be sent to the web server. If you do, it is a matter of fairness not to use any address that is actually used by a real person. </P ><P > This action is rarely needed, as modern web browsers don't send <SPAN CLASS="QUOTE" >"From:"</SPAN > headers anymore. </P ></DD ><DT >Example usage:</DT ><DD ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+hide-from-header{block}</PRE ></TD ></TR ></TABLE > or <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+hide-from-header{spam-me-senseless@sittingduck.example.com}</PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="HIDE-REFERRER" >8.5.24. hide-referrer</A ></H4 ><A NAME="HIDE-REFERER" ></A ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P >Conceal which link you followed to get to a particular site</P ></DD ><DT >Effect:</DT ><DD ><P > Deletes the <SPAN CLASS="QUOTE" >"Referer:"</SPAN > (sic) HTTP header from the client request, or replaces it with a forged one. </P ></DD ><DT >Type:</DT ><DD ><P >Parameterized.</P ></DD ><DT >Parameter:</DT ><DD ><P ></P ><UL ><LI ><P ><SPAN CLASS="QUOTE" >"conditional-block"</SPAN > to delete the header completely if the host has changed.</P ></LI ><LI ><P ><SPAN CLASS="QUOTE" >"conditional-forge"</SPAN > to forge the header if the host has changed.</P ></LI ><LI ><P ><SPAN CLASS="QUOTE" >"block"</SPAN > to delete the header unconditionally.</P ></LI ><LI ><P ><SPAN CLASS="QUOTE" >"forge"</SPAN > to pretend to be coming from the homepage of the server we are talking to.</P ></LI ><LI ><P >Any other string to set a user defined referrer.</P ></LI ></UL ></DD ><DT >Notes:</DT ><DD ><P > <TT CLASS="LITERAL" >conditional-block</TT > is the only parameter, that isn't easily detected in the server's log file. If it blocks the referrer, the request will look like the visitor used a bookmark or typed in the address directly. </P ><P > Leaving the referrer unmodified for requests on the same host allows the server owner to see the visitor's <SPAN CLASS="QUOTE" >"click path"</SPAN >, but in most cases she could also get that information by comparing other parts of the log file: for example the User-Agent if it isn't a very common one, or the user's IP address if it doesn't change between different requests. </P ><P > Always blocking the referrer, or using a custom one, can lead to failures on servers that check the referrer before they answer any requests, in an attempt to prevent their content from being embedded or linked to elsewhere. </P ><P > Both <TT CLASS="LITERAL" >conditional-block</TT > and <TT CLASS="LITERAL" >forge</TT > will work with referrer checks, as long as content and valid referring page are on the same host. Most of the time that's the case. </P ><P > <TT CLASS="LITERAL" >hide-referer</TT > is an alternate spelling of <TT CLASS="LITERAL" >hide-referrer</TT > and the two can be can be freely substituted with each other. (<SPAN CLASS="QUOTE" >"referrer"</SPAN > is the correct English spelling, however the HTTP specification has a bug - it requires it to be spelled as <SPAN CLASS="QUOTE" >"referer"</SPAN >.) </P ></DD ><DT >Example usage:</DT ><DD ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+hide-referrer{forge}</PRE ></TD ></TR ></TABLE > or <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+hide-referrer{http://www.yahoo.com/}</PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="HIDE-USER-AGENT" >8.5.25. hide-user-agent</A ></H4 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P >Try to conceal your type of browser and client operating system</P ></DD ><DT >Effect:</DT ><DD ><P > Replaces the value of the <SPAN CLASS="QUOTE" >"User-Agent:"</SPAN > HTTP header in client requests with the specified value. </P ></DD ><DT >Type:</DT ><DD ><P >Parameterized.</P ></DD ><DT >Parameter:</DT ><DD ><P > Any user-defined string. </P ></DD ><DT >Notes:</DT ><DD ><DIV CLASS="WARNING" ><P ></P ><TABLE CLASS="WARNING" BORDER="1" WIDTH="90%" ><TR ><TD ALIGN="CENTER" ><B >Warning</B ></TD ></TR ><TR ><TD ALIGN="LEFT" ><P > This can lead to problems on web sites that depend on looking at this header in order to customize their content for different browsers (which, by the way, is <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >NOT</I ></SPAN > the right thing to do: good web sites work browser-independently). </P ></TD ></TR ></TABLE ></DIV ><P > Using this action in multi-user setups or wherever different types of browsers will access the same <SPAN CLASS="APPLICATION" >Privoxy</SPAN > is <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >not recommended</I ></SPAN >. In single-user, single-browser setups, you might use it to delete your OS version information from the headers, because it is an invitation to exploit known bugs for your OS. It is also occasionally useful to forge this in order to access sites that won't let you in otherwise (though there may be a good reason in some cases). Example of this: some MSN sites will not let <SPAN CLASS="APPLICATION" >Mozilla</SPAN > enter, yet forging to a <SPAN CLASS="APPLICATION" >Netscape 6.1</SPAN > user-agent works just fine. (Must be just a silly MS goof, I'm sure :-). </P ><P > More information on known user-agent strings can be found at <A HREF="http://www.user-agents.org/" TARGET="_top" >http://www.user-agents.org/</A > and <A HREF="http://en.wikipedia.org/wiki/User_agent" TARGET="_top" >http://en.wikipedia.org/wiki/User_agent</A >. </P ></DD ><DT >Example usage:</DT ><DD ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+hide-user-agent{Netscape 6.1 (X11; I; Linux 2.4.18 i686)}</PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="LIMIT-CONNECT" >8.5.26. limit-connect</A ></H4 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P >Prevent abuse of <SPAN CLASS="APPLICATION" >Privoxy</SPAN > as a TCP proxy relay or disable SSL for untrusted sites</P ></DD ><DT >Effect:</DT ><DD ><P > Specifies to which ports HTTP CONNECT requests are allowable. </P ></DD ><DT >Type:</DT ><DD ><P >Parameterized.</P ></DD ><DT >Parameter:</DT ><DD ><P > A comma-separated list of ports or port ranges (the latter using dashes, with the minimum defaulting to 0 and the maximum to 65K). </P ></DD ><DT >Notes:</DT ><DD ><P > By default, i.e. if no <TT CLASS="LITERAL" >limit-connect</TT > action applies, <SPAN CLASS="APPLICATION" >Privoxy</SPAN > allows HTTP CONNECT requests to all ports. Use <TT CLASS="LITERAL" >limit-connect</TT > if fine-grained control is desired for some or all destinations. </P ><P > The CONNECT methods exists in HTTP to allow access to secure websites (<SPAN CLASS="QUOTE" >"https://"</SPAN > URLs) through proxies. It works very simply: the proxy connects to the server on the specified port, and then short-circuits its connections to the client and to the remote server. This means CONNECT-enabled proxies can be used as TCP relays very easily. </P ><P > <SPAN CLASS="APPLICATION" >Privoxy</SPAN > relays HTTPS traffic without seeing the decoded content. Websites can leverage this limitation to circumvent <SPAN CLASS="APPLICATION" >Privoxy</SPAN >'s filters. By specifying an invalid port range you can disable HTTPS entirely. </P ></DD ><DT >Example usages:</DT ><DD ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+limit-connect{443} # Port 443 is OK. +limit-connect{80,443} # Ports 80 and 443 are OK. +limit-connect{-3, 7, 20-100, 500-} # Ports less than 3, 7, 20 to 100 and above 500 are OK. +limit-connect{-} # All ports are OK +limit-connect{,} # No HTTPS/SSL traffic is allowed</PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="PREVENT-COMPRESSION" >8.5.27. prevent-compression</A ></H4 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P > Ensure that servers send the content uncompressed, so it can be passed through <TT CLASS="LITERAL" ><A HREF="actions-file.html#FILTER" >filter</A ></TT >s. </P ></DD ><DT >Effect:</DT ><DD ><P > Removes the Accept-Encoding header which can be used to ask for compressed transfer. </P ></DD ><DT >Type:</DT ><DD ><P >Boolean.</P ></DD ><DT >Parameter:</DT ><DD ><P > N/A </P ></DD ><DT >Notes:</DT ><DD ><P > More and more websites send their content compressed by default, which is generally a good idea and saves bandwidth. But the <TT CLASS="LITERAL" ><A HREF="actions-file.html#FILTER" >filter</A ></TT > and <TT CLASS="LITERAL" ><A HREF="actions-file.html#DEANIMATE-GIFS" >deanimate-gifs</A ></TT > actions need access to the uncompressed data. </P ><P > When compiled with zlib support (available since <SPAN CLASS="APPLICATION" >Privoxy</SPAN > 3.0.7), content that should be filtered is decompressed on-the-fly and you don't have to worry about this action. If you are using an older <SPAN CLASS="APPLICATION" >Privoxy</SPAN > version, or one that hasn't been compiled with zlib support, this action can be used to convince the server to send the content uncompressed. </P ><P > Most text-based instances compress very well, the size is seldom decreased by less than 50%, for markup-heavy instances like news feeds saving more than 90% of the original size isn't unusual. </P ><P > Not using compression will therefore slow down the transfer, and you should only enable this action if you really need it. As of <SPAN CLASS="APPLICATION" >Privoxy</SPAN > 3.0.7 it's disabled in all predefined action settings. </P ><P > Note that some (rare) ill-configured sites don't handle requests for uncompressed documents correctly. Broken PHP applications tend to send an empty document body, some IIS versions only send the beginning of the content. If you enable <TT CLASS="LITERAL" >prevent-compression</TT > per default, you might want to add exceptions for those sites. See the example for how to do that. </P ></DD ><DT >Example usage (sections):</DT ><DD ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" ># Selectively turn off compression, and enable a filter # { +filter{tiny-textforms} +prevent-compression } # Match only these sites .google. sourceforge.net sf.net # Or instead, we could set a universal default: # { +prevent-compression } / # Match all sites # Then maybe make exceptions for broken sites: # { -prevent-compression } .compusa.com/</PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="OVERWRITE-LAST-MODIFIED" >8.5.28. overwrite-last-modified</A ></H4 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P >Prevent yet another way to track the user's steps between sessions.</P ></DD ><DT >Effect:</DT ><DD ><P > Deletes the <SPAN CLASS="QUOTE" >"Last-Modified:"</SPAN > HTTP server header or modifies its value. </P ></DD ><DT >Type:</DT ><DD ><P >Parameterized.</P ></DD ><DT >Parameter:</DT ><DD ><P > One of the keywords: <SPAN CLASS="QUOTE" >"block"</SPAN >, <SPAN CLASS="QUOTE" >"reset-to-request-time"</SPAN > and <SPAN CLASS="QUOTE" >"randomize"</SPAN > </P ></DD ><DT >Notes:</DT ><DD ><P > Removing the <SPAN CLASS="QUOTE" >"Last-Modified:"</SPAN > header is useful for filter testing, where you want to force a real reload instead of getting status code <SPAN CLASS="QUOTE" >"304"</SPAN >, which would cause the browser to reuse the old version of the page. </P ><P > The <SPAN CLASS="QUOTE" >"randomize"</SPAN > option overwrites the value of the <SPAN CLASS="QUOTE" >"Last-Modified:"</SPAN > header with a randomly chosen time between the original value and the current time. In theory the server could send each document with a different <SPAN CLASS="QUOTE" >"Last-Modified:"</SPAN > header to track visits without using cookies. <SPAN CLASS="QUOTE" >"Randomize"</SPAN > makes it impossible and the browser can still revalidate cached documents. </P ><P > <SPAN CLASS="QUOTE" >"reset-to-request-time"</SPAN > overwrites the value of the <SPAN CLASS="QUOTE" >"Last-Modified:"</SPAN > header with the current time. You could use this option together with <TT CLASS="LITERAL" ><A HREF="actions-file.html#HIDE-IF-MODIFIED-SINCE" >hide-if-modified-since</A ></TT > to further customize your random range. </P ><P > The preferred parameter here is <SPAN CLASS="QUOTE" >"randomize"</SPAN >. It is safe to use, as long as the time settings are more or less correct. If the server sets the <SPAN CLASS="QUOTE" >"Last-Modified:"</SPAN > header to the time of the request, the random range becomes zero and the value stays the same. Therefore you should later randomize it a second time with <TT CLASS="LITERAL" ><A HREF="actions-file.html#HIDE-IF-MODIFIED-SINCE" >hided-if-modified-since</A ></TT >, just to be sure. </P ><P > It is also recommended to use this action together with <TT CLASS="LITERAL" ><A HREF="actions-file.html#CRUNCH-IF-NONE-MATCH" >crunch-if-none-match</A ></TT >. </P ></DD ><DT >Example usage:</DT ><DD ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" ># Let the browser revalidate without being tracked across sessions { +hide-if-modified-since{-60} \ +overwrite-last-modified{randomize} \ +crunch-if-none-match} /</PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="REDIRECT" >8.5.29. redirect</A ></H4 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P > Redirect requests to other sites. </P ></DD ><DT >Effect:</DT ><DD ><P > Convinces the browser that the requested document has been moved to another location and the browser should get it from there. </P ></DD ><DT >Type:</DT ><DD ><P >Parameterized</P ></DD ><DT >Parameter:</DT ><DD ><P > An absolute URL or a single pcrs command. </P ></DD ><DT >Notes:</DT ><DD ><P > Requests to which this action applies are answered with a HTTP redirect to URLs of your choosing. The new URL is either provided as parameter, or derived by applying a single pcrs command to the original URL. </P ><P > This action will be ignored if you use it together with <TT CLASS="LITERAL" ><A HREF="actions-file.html#BLOCK" >block</A ></TT >. It can be combined with <TT CLASS="LITERAL" ><A HREF="actions-file.html#FAST-REDIRECTS" >fast-redirects{check-decoded-url}</A ></TT > to redirect to a decoded version of a rewritten URL. </P ><P > Use this action carefully, make sure not to create redirection loops and be aware that using your own redirects might make it possible to fingerprint your requests. </P ><P > In case of problems with your redirects, or simply to watch them working, enable <A HREF="config.html#DEBUG" >debug 128</A >. </P ></DD ><DT >Example usages:</DT ><DD ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" ># Replace example.com's style sheet with another one { +redirect{http://localhost/css-replacements/example.com.css} } example.com/stylesheet\.css # Create a short, easy to remember nickname for a favorite site # (relies on the browser accept and forward invalid URLs to <SPAN CLASS="APPLICATION" >Privoxy</SPAN >) { +redirect{http://www.privoxy.org/user-manual/actions-file.html} } a # Always use the expanded view for Undeadly.org articles # (Note the $ at the end of the URL pattern to make sure # the request for the rewritten URL isn't redirected as well) {+redirect{s@$@&mode=expanded@}} undeadly.org/cgi\?action=article&sid=\d*$ # Redirect Google search requests to MSN {+redirect{s@^http://[^/]*/search\?q=([^&]*).*@http://search.msn.com/results.aspx?q=$1@}} .google.com/search # Redirect MSN search requests to Yahoo {+redirect{s@^http://[^/]*/results\.aspx\?q=([^&]*).*@http://search.yahoo.com/search?p=$1@}} search.msn.com//results\.aspx\?q= # Redirect remote requests for this manual # to the local version delivered by Privoxy {+redirect{s@^http://www@http://config@}} www.privoxy.org/user-manual/</PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="SERVER-HEADER-FILTER" >8.5.30. server-header-filter</A ></H4 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P > Rewrite or remove single server headers. </P ></DD ><DT >Effect:</DT ><DD ><P > All server headers to which this action applies are filtered on-the-fly through the specified regular expression based substitutions. </P ></DD ><DT >Type:</DT ><DD ><P >Parameterized.</P ></DD ><DT >Parameter:</DT ><DD ><P > The name of a server-header filter, as defined in one of the <A HREF="filter-file.html" >filter files</A >. </P ></DD ><DT >Notes:</DT ><DD ><P > Server-header filters are applied to each header on its own, not to all at once. This makes it easier to diagnose problems, but on the downside you can't write filters that only change header x if header y's value is z. You can do that by using tags though. </P ><P > Server-header filters are executed after the other header actions have finished and use their output as input. </P ><P > Please refer to the <A HREF="filter-file.html" >filter file chapter</A > to learn which server-header filters are available by default, and how to create your own. </P ></DD ><DT >Example usage (section):</DT ><DD ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >{+server-header-filter{html-to-xml}} example.org/xml-instance-that-is-delivered-as-html {+server-header-filter{xml-to-html}} example.org/instance-that-is-delivered-as-xml-but-is-not </PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="SERVER-HEADER-TAGGER" >8.5.31. server-header-tagger</A ></H4 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P > Enable or disable filters based on the Content-Type header. </P ></DD ><DT >Effect:</DT ><DD ><P > Server headers to which this action applies are filtered on-the-fly through the specified regular expression based substitutions, the result is used as tag. </P ></DD ><DT >Type:</DT ><DD ><P >Parameterized.</P ></DD ><DT >Parameter:</DT ><DD ><P > The name of a server-header tagger, as defined in one of the <A HREF="filter-file.html" >filter files</A >. </P ></DD ><DT >Notes:</DT ><DD ><P > Server-header taggers are applied to each header on its own, and as the header isn't modified, each tagger <SPAN CLASS="QUOTE" >"sees"</SPAN > the original. </P ><P > Server-header taggers are executed before all other header actions that modify server headers. Their tags can be used to control all of the other server-header actions, the content filters and the crunch actions (<A HREF="actions-file.html#REDIRECT" >redirect</A > and <A HREF="actions-file.html#BLOCK" >block</A >). </P ><P > Obviously crunching based on tags created by server-header taggers doesn't prevent the request from showing up in the server's log file. </P ></DD ><DT >Example usage (section):</DT ><DD ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" ># Tag every request with the content type declared by the server {+server-header-tagger{content-type}} / </PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="SESSION-COOKIES-ONLY" >8.5.32. session-cookies-only</A ></H4 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P > Allow only temporary <SPAN CLASS="QUOTE" >"session"</SPAN > cookies (for the current browser session <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >only</I ></SPAN >). </P ></DD ><DT >Effect:</DT ><DD ><P > Deletes the <SPAN CLASS="QUOTE" >"expires"</SPAN > field from <SPAN CLASS="QUOTE" >"Set-Cookie:"</SPAN > server headers. Most browsers will not store such cookies permanently and forget them in between sessions. </P ></DD ><DT >Type:</DT ><DD ><P >Boolean.</P ></DD ><DT >Parameter:</DT ><DD ><P > N/A </P ></DD ><DT >Notes:</DT ><DD ><P > This is less strict than <TT CLASS="LITERAL" ><A HREF="actions-file.html#CRUNCH-INCOMING-COOKIES" >crunch-incoming-cookies</A ></TT > / <TT CLASS="LITERAL" ><A HREF="actions-file.html#CRUNCH-OUTGOING-COOKIES" >crunch-outgoing-cookies</A ></TT > and allows you to browse websites that insist or rely on setting cookies, without compromising your privacy too badly. </P ><P > Most browsers will not permanently store cookies that have been processed by <TT CLASS="LITERAL" >session-cookies-only</TT > and will forget about them between sessions. This makes profiling cookies useless, but won't break sites which require cookies so that you can log in for transactions. This is generally turned on for all sites, and is the recommended setting. </P ><P > It makes <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >no sense at all</I ></SPAN > to use <TT CLASS="LITERAL" >session-cookies-only</TT > together with <TT CLASS="LITERAL" ><A HREF="actions-file.html#CRUNCH-INCOMING-COOKIES" >crunch-incoming-cookies</A ></TT > or <TT CLASS="LITERAL" ><A HREF="actions-file.html#CRUNCH-OUTGOING-COOKIES" >crunch-outgoing-cookies</A ></TT >. If you do, cookies will be plainly killed. </P ><P > Note that it is up to the browser how it handles such cookies without an <SPAN CLASS="QUOTE" >"expires"</SPAN > field. If you use an exotic browser, you might want to try it out to be sure. </P ><P > This setting also has no effect on cookies that may have been stored previously by the browser before starting <SPAN CLASS="APPLICATION" >Privoxy</SPAN >. These would have to be removed manually. </P ><P > <SPAN CLASS="APPLICATION" >Privoxy</SPAN > also uses the <A HREF="actions-file.html#FILTER-CONTENT-COOKIES" >content-cookies filter</A > to block some types of cookies. Content cookies are not effected by <TT CLASS="LITERAL" >session-cookies-only</TT >. </P ></DD ><DT >Example usage:</DT ><DD ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+session-cookies-only</PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H4 CLASS="SECT3" ><A NAME="SET-IMAGE-BLOCKER" >8.5.33. set-image-blocker</A ></H4 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT >Typical use:</DT ><DD ><P >Choose the replacement for blocked images</P ></DD ><DT >Effect:</DT ><DD ><P > This action alone doesn't do anything noticeable. If <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >both</I ></SPAN > <TT CLASS="LITERAL" ><A HREF="actions-file.html#BLOCK" >block</A ></TT > <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >and</I ></SPAN > <TT CLASS="LITERAL" ><A HREF="actions-file.html#HANDLE-AS-IMAGE" >handle-as-image</A ></TT > <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >also</I ></SPAN > apply, i.e. if the request is to be blocked as an image, <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >then</I ></SPAN > the parameter of this action decides what will be sent as a replacement. </P ></DD ><DT >Type:</DT ><DD ><P >Parameterized.</P ></DD ><DT >Parameter:</DT ><DD ><P ></P ><UL ><LI ><P > <SPAN CLASS="QUOTE" >"pattern"</SPAN > to send a built-in checkerboard pattern image. The image is visually decent, scales very well, and makes it obvious where banners were busted. </P ></LI ><LI ><P > <SPAN CLASS="QUOTE" >"blank"</SPAN > to send a built-in transparent image. This makes banners disappear completely, but makes it hard to detect where <SPAN CLASS="APPLICATION" >Privoxy</SPAN > has blocked images on a given page and complicates troubleshooting if <SPAN CLASS="APPLICATION" >Privoxy</SPAN > has blocked innocent images, like navigation icons. </P ></LI ><LI ><P > <SPAN CLASS="QUOTE" >"<TT CLASS="REPLACEABLE" ><I >target-url</I ></TT >"</SPAN > to send a redirect to <TT CLASS="REPLACEABLE" ><I >target-url</I ></TT >. You can redirect to any image anywhere, even in your local filesystem via <SPAN CLASS="QUOTE" >"file:///"</SPAN > URL. (But note that not all browsers support redirecting to a local file system). </P ><P > A good application of redirects is to use special <SPAN CLASS="APPLICATION" >Privoxy</SPAN >-built-in URLs, which send the built-in images, as <TT CLASS="REPLACEABLE" ><I >target-url</I ></TT >. This has the same visual effect as specifying <SPAN CLASS="QUOTE" >"blank"</SPAN > or <SPAN CLASS="QUOTE" >"pattern"</SPAN > in the first place, but enables your browser to cache the replacement image, instead of requesting it over and over again. </P ></LI ></UL ></DD ><DT >Notes:</DT ><DD ><P > The URLs for the built-in images are <SPAN CLASS="QUOTE" >"http://config.privoxy.org/send-banner?type=<TT CLASS="REPLACEABLE" ><I >type</I ></TT >"</SPAN >, where <TT CLASS="REPLACEABLE" ><I >type</I ></TT > is either <SPAN CLASS="QUOTE" >"blank"</SPAN > or <SPAN CLASS="QUOTE" >"pattern"</SPAN >. </P ><P > There is a third (advanced) type, called <SPAN CLASS="QUOTE" >"auto"</SPAN >. It is <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >NOT</I ></SPAN > to be used in <TT CLASS="LITERAL" >set-image-blocker</TT >, but meant for use from <A HREF="filter-file.html" >filters</A >. Auto will select the type of image that would have applied to the referring page, had it been an image. </P ></DD ><DT >Example usage:</DT ><DD ><P > Built-in pattern: </P ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+set-image-blocker{pattern}</PRE ></TD ></TR ></TABLE > </P ><P > Redirect to the BSD daemon: </P ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+set-image-blocker{http://www.freebsd.org/gifs/dae_up3.gif}</PRE ></TD ></TR ></TABLE > </P ><P > Redirect to the built-in pattern for better caching: </P ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="90%" ><TR ><TD ><PRE CLASS="SCREEN" >+set-image-blocker{http://config.privoxy.org/send-banner?type=pattern}</PRE ></TD ></TR ></TABLE > </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT3" ><H3 CLASS="SECT3" ><A NAME="AEN4093" >8.5.34. Summary</A ></H3 ><P > Note that many of these actions have the potential to cause a page to misbehave, possibly even not to display at all. There are many ways a site designer may choose to design his site, and what HTTP header content, and other criteria, he may depend on. There is no way to have hard and fast rules for all sites. See the <A HREF="appendix.html#ACTIONSANAT" >Appendix</A > for a brief example on troubleshooting actions.</P ></DIV ></DIV ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="ALIASES" >8.6. Aliases</A ></H2 ><P > Custom <SPAN CLASS="QUOTE" >"actions"</SPAN >, known to <SPAN CLASS="APPLICATION" >Privoxy</SPAN > as <SPAN CLASS="QUOTE" >"aliases"</SPAN >, can be defined by combining other actions. These can in turn be invoked just like the built-in actions. Currently, an alias name can contain any character except space, tab, <SPAN CLASS="QUOTE" >"="</SPAN >, <SPAN CLASS="QUOTE" >"{"</SPAN > and <SPAN CLASS="QUOTE" >"}"</SPAN >, but we <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >strongly recommend</I ></SPAN > that you only use <SPAN CLASS="QUOTE" >"a"</SPAN > to <SPAN CLASS="QUOTE" >"z"</SPAN >, <SPAN CLASS="QUOTE" >"0"</SPAN > to <SPAN CLASS="QUOTE" >"9"</SPAN >, <SPAN CLASS="QUOTE" >"+"</SPAN >, and <SPAN CLASS="QUOTE" >"-"</SPAN >. Alias names are not case sensitive, and are not required to start with a <SPAN CLASS="QUOTE" >"+"</SPAN > or <SPAN CLASS="QUOTE" >"-"</SPAN > sign, since they are merely textually expanded.</P ><P > Aliases can be used throughout the actions file, but they <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >must be defined in a special section at the top of the file!</I ></SPAN > And there can only be one such section per actions file. Each actions file may have its own alias section, and the aliases defined in it are only visible within that file.</P ><P > There are two main reasons to use aliases: One is to save typing for frequently used combinations of actions, the other one is a gain in flexibility: If you decide once how you want to handle shops by defining an alias called <SPAN CLASS="QUOTE" >"shop"</SPAN >, you can later change your policy on shops in <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >one</I ></SPAN > place, and your changes will take effect everywhere in the actions file where the <SPAN CLASS="QUOTE" >"shop"</SPAN > alias is used. Calling aliases by their purpose also makes your actions files more readable.</P ><P > Currently, there is one big drawback to using aliases, though: <SPAN CLASS="APPLICATION" >Privoxy</SPAN >'s built-in web-based action file editor honors aliases when reading the actions files, but it expands them before writing. So the effects of your aliases are of course preserved, but the aliases themselves are lost when you edit sections that use aliases with it.</P ><P > Now let's define some aliases...</P ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><PRE CLASS="SCREEN" > # Useful custom aliases we can use later. # # Note the (required!) section header line and that this section # must be at the top of the actions file! # {{alias}} # These aliases just save typing later: # (Note that some already use other aliases!) # +crunch-all-cookies = +<A HREF="actions-file.html#CRUNCH-INCOMING-COOKIES" >crunch-incoming-cookies</A > +<A HREF="actions-file.html#CRUNCH-OUTGOING-COOKIES" >crunch-outgoing-cookies</A > -crunch-all-cookies = -<A HREF="actions-file.html#CRUNCH-INCOMING-COOKIES" >crunch-incoming-cookies</A > -<A HREF="actions-file.html#CRUNCH-OUTGOING-COOKIES" >crunch-outgoing-cookies</A > +block-as-image = +block{Blocked image.} +handle-as-image allow-all-cookies = -crunch-all-cookies -<A HREF="actions-file.html#SESSION-COOKIES-ONLY" >session-cookies-only</A > -<A HREF="actions-file.html#FILTER-CONTENT-COOKIES" >filter{content-cookies}</A > # These aliases define combinations of actions # that are useful for certain types of sites: # fragile = -<A HREF="actions-file.html#BLOCK" >block</A > -<A HREF="actions-file.html#FILTER" >filter</A > -crunch-all-cookies -<A HREF="actions-file.html#FAST-REDIRECTS" >fast-redirects</A > -<A HREF="actions-file.html#HIDE-REFERER" >hide-referrer</A > -<A HREF="actions-file.html#PREVENT-COMPRESSION" >prevent-compression</A > shop = -crunch-all-cookies -<A HREF="actions-file.html#FILTER-ALL-POPUPS" >filter{all-popups}</A > # Short names for other aliases, for really lazy people ;-) # c0 = +crunch-all-cookies c1 = -crunch-all-cookies</PRE ></TD ></TR ></TABLE ></P ><P > ...and put them to use. These sections would appear in the lower part of an actions file and define exceptions to the default actions (as specified further up for the <SPAN CLASS="QUOTE" >"/"</SPAN > pattern):</P ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><PRE CLASS="SCREEN" > # These sites are either very complex or very keen on # user data and require minimal interference to work: # {fragile} .office.microsoft.com .windowsupdate.microsoft.com # Gmail is really mail.google.com, not gmail.com mail.google.com # Shopping sites: # Allow cookies (for setting and retrieving your customer data) # {shop} .quietpc.com .worldpay.com # for quietpc.com mybank.example.com # These shops require pop-ups: # {-filter{all-popups} -filter{unsolicited-popups}} .dabs.com .overclockers.co.uk</PRE ></TD ></TR ></TABLE ></P ><P > Aliases like <SPAN CLASS="QUOTE" >"shop"</SPAN > and <SPAN CLASS="QUOTE" >"fragile"</SPAN > are typically used for <SPAN CLASS="QUOTE" >"problem"</SPAN > sites that require more than one action to be disabled in order to function properly.</P ></DIV ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="ACT-EXAMPLES" >8.7. Actions Files Tutorial</A ></H2 ><P > The above chapters have shown <A HREF="actions-file.html" >which actions files there are and how they are organized</A >, how actions are <A HREF="actions-file.html#ACTIONS" >specified</A > and <A HREF="actions-file.html#ACTIONS-APPLY" >applied to URLs</A >, how <A HREF="actions-file.html#AF-PATTERNS" >patterns</A > work, and how to define and use <A HREF="actions-file.html#ALIASES" >aliases</A >. Now, let's look at an example <TT CLASS="FILENAME" >match-all.action</TT >, <TT CLASS="FILENAME" >default.action</TT > and <TT CLASS="FILENAME" >user.action</TT > file and see how all these pieces come together:</P ><DIV CLASS="SECT3" ><H3 CLASS="SECT3" ><A NAME="AEN4157" >8.7.1. match-all.action</A ></H3 ><P > Remember <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >all actions are disabled when matching starts</I ></SPAN >, so we have to explicitly enable the ones we want.</P ><P > While the <TT CLASS="FILENAME" >match-all.action</TT > file only contains a single section, it is probably the most important one. It has only one pattern, <SPAN CLASS="QUOTE" >"<TT CLASS="LITERAL" >/</TT >"</SPAN >, but this pattern <A HREF="actions-file.html#AF-PATTERNS" >matches all URLs</A >. Therefore, the set of actions used in this <SPAN CLASS="QUOTE" >"default"</SPAN > section <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >will be applied to all requests as a start</I ></SPAN >. It can be partly or wholly overridden by other actions files like <TT CLASS="FILENAME" >default.action</TT > and <TT CLASS="FILENAME" >user.action</TT >, but it will still be largely responsible for your overall browsing experience.</P ><P > Again, at the start of matching, all actions are disabled, so there is no need to disable any actions here. (Remember: a <SPAN CLASS="QUOTE" >"+"</SPAN > preceding the action name enables the action, a <SPAN CLASS="QUOTE" >"-"</SPAN > disables!). Also note how this long line has been made more readable by splitting it into multiple lines with line continuation.</P ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><PRE CLASS="SCREEN" >{ \ +<A HREF="actions-file.html#CHANGE-X-FORWARDED-FOR" >change-x-forwarded-for{block}</A > \ +<A HREF="actions-file.html#HIDE-FROM-HEADER" >hide-from-header{block}</A > \ +<A HREF="actions-file.html#SET-IMAGE-BLOCKER" >set-image-blocker{pattern}</A > \ } / # Match all URLs </PRE ></TD ></TR ></TABLE ></P ><P > The default behavior is now set.</P ></DIV ><DIV CLASS="SECT3" ><H3 CLASS="SECT3" ><A NAME="AEN4179" >8.7.2. default.action</A ></H3 ><P > If you aren't a developer, there's no need for you to edit the <TT CLASS="FILENAME" >default.action</TT > file. It is maintained by the <SPAN CLASS="APPLICATION" >Privoxy</SPAN > developers and if you disagree with some of the sections, you should overrule them in your <TT CLASS="FILENAME" >user.action</TT >.</P ><P > Understanding the <TT CLASS="FILENAME" >default.action</TT > file can help you with your <TT CLASS="FILENAME" >user.action</TT >, though.</P ><P > The first section in this file is a special section for internal use that prevents older <SPAN CLASS="APPLICATION" >Privoxy</SPAN > versions from reading the file:</P ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><PRE CLASS="SCREEN" >########################################################################## # Settings -- Don't change! For internal Privoxy use ONLY. ########################################################################## {{settings}} for-privoxy-version=3.0.11</PRE ></TD ></TR ></TABLE ></P ><P > After that comes the (optional) alias section. We'll use the example section from the above <A HREF="actions-file.html#ALIASES" >chapter on aliases</A >, that also explains why and how aliases are used:</P ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><PRE CLASS="SCREEN" >########################################################################## # Aliases ########################################################################## {{alias}} # These aliases just save typing later: # (Note that some already use other aliases!) # +crunch-all-cookies = +<A HREF="actions-file.html#CRUNCH-INCOMING-COOKIES" >crunch-incoming-cookies</A > +<A HREF="actions-file.html#CRUNCH-OUTGOING-COOKIES" >crunch-outgoing-cookies</A > -crunch-all-cookies = -<A HREF="actions-file.html#CRUNCH-INCOMING-COOKIES" >crunch-incoming-cookies</A > -<A HREF="actions-file.html#CRUNCH-OUTGOING-COOKIES" >crunch-outgoing-cookies</A > +block-as-image = +block{Blocked image.} +handle-as-image mercy-for-cookies = -crunch-all-cookies -<A HREF="actions-file.html#SESSION-COOKIES-ONLY" >session-cookies-only</A > -<A HREF="actions-file.html#FILTER-CONTENT-COOKIES" >filter{content-cookies}</A > # These aliases define combinations of actions # that are useful for certain types of sites: # fragile = -<A HREF="actions-file.html#BLOCK" >block</A > -<A HREF="actions-file.html#FILTER" >filter</A > -crunch-all-cookies -<A HREF="actions-file.html#FAST-REDIRECTS" >fast-redirects</A > -<A HREF="actions-file.html#HIDE-REFERER" >hide-referrer</A > shop = -crunch-all-cookies -<A HREF="actions-file.html#FILTER-ALL-POPUPS" >filter{all-popups}</A ></PRE ></TD ></TR ></TABLE ></P ><P > The first of our specialized sections is concerned with <SPAN CLASS="QUOTE" >"fragile"</SPAN > sites, i.e. sites that require minimum interference, because they are either very complex or very keen on tracking you (and have mechanisms in place that make them unusable for people who avoid being tracked). We will simply use our pre-defined <TT CLASS="LITERAL" >fragile</TT > alias instead of stating the list of actions explicitly:</P ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><PRE CLASS="SCREEN" >########################################################################## # Exceptions for sites that'll break under the default action set: ########################################################################## # "Fragile" Use a minimum set of actions for these sites (see alias above): # { fragile } .office.microsoft.com # surprise, surprise! .windowsupdate.microsoft.com mail.google.com</PRE ></TD ></TR ></TABLE ></P ><P > Shopping sites are not as fragile, but they typically require cookies to log in, and pop-up windows for shopping carts or item details. Again, we'll use a pre-defined alias:</P ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><PRE CLASS="SCREEN" ># Shopping sites: # { shop } .quietpc.com .worldpay.com # for quietpc.com .jungle.com .scan.co.uk</PRE ></TD ></TR ></TABLE ></P ><P > The <TT CLASS="LITERAL" ><A HREF="actions-file.html#FAST-REDIRECTS" >fast-redirects</A ></TT > action, which may have been enabled in <TT CLASS="FILENAME" >match-all.action</TT >, breaks some sites. So disable it for popular sites where we know it misbehaves:</P ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><PRE CLASS="SCREEN" >{ -<A HREF="actions-file.html#FAST-REDIRECTS" >fast-redirects</A > } login.yahoo.com edit.*.yahoo.com .google.com .altavista.com/.*(like|url|link):http .altavista.com/trans.*urltext=http .nytimes.com</PRE ></TD ></TR ></TABLE ></P ><P > It is important that <SPAN CLASS="APPLICATION" >Privoxy</SPAN > knows which URLs belong to images, so that <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >if</I ></SPAN > they are to be blocked, a substitute image can be sent, rather than an HTML page. Contacting the remote site to find out is not an option, since it would destroy the loading time advantage of banner blocking, and it would feed the advertisers information about you. We can mark any URL as an image with the <TT CLASS="LITERAL" ><A HREF="actions-file.html#HANDLE-AS-IMAGE" >handle-as-image</A ></TT > action, and marking all URLs that end in a known image file extension is a good start:</P ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><PRE CLASS="SCREEN" >########################################################################## # Images: ########################################################################## # Define which file types will be treated as images, in case they get # blocked further down this file: # { +<A HREF="actions-file.html#HANDLE-AS-IMAGE" >handle-as-image</A > } /.*\.(gif|jpe?g|png|bmp|ico)$</PRE ></TD ></TR ></TABLE ></P ><P > And then there are known banner sources. They often use scripts to generate the banners, so it won't be visible from the URL that the request is for an image. Hence we block them <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >and</I ></SPAN > mark them as images in one go, with the help of our <TT CLASS="LITERAL" >+block-as-image</TT > alias defined above. (We could of course just as well use <TT CLASS="LITERAL" >+<A HREF="actions-file.html#BLOCK" >block</A > +<A HREF="actions-file.html#HANDLE-AS-IMAGE" >handle-as-image</A ></TT > here.) Remember that the type of the replacement image is chosen by the <TT CLASS="LITERAL" ><A HREF="actions-file.html#SET-IMAGE-BLOCKER" >set-image-blocker</A ></TT > action. Since all URLs have matched the default section with its <TT CLASS="LITERAL" >+<A HREF="actions-file.html#SET-IMAGE-BLOCKER" >set-image-blocker</A >{pattern}</TT > action before, it still applies and needn't be repeated:</P ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><PRE CLASS="SCREEN" ># Known ad generators: # { +block-as-image } ar.atwola.com .ad.doubleclick.net .ad.*.doubleclick.net .a.yimg.com/(?:(?!/i/).)*$ .a[0-9].yimg.com/(?:(?!/i/).)*$ bs*.gsanet.com .qkimg.net</PRE ></TD ></TR ></TABLE ></P ><P > One of the most important jobs of <SPAN CLASS="APPLICATION" >Privoxy</SPAN > is to block banners. Many of these can be <SPAN CLASS="QUOTE" >"blocked"</SPAN > by the <TT CLASS="LITERAL" ><A HREF="actions-file.html#FILTER" >filter</A >{banners-by-size}</TT > action, which we enabled above, and which deletes the references to banner images from the pages while they are loaded, so the browser doesn't request them anymore, and hence they don't need to be blocked here. But this naturally doesn't catch all banners, and some people choose not to use filters, so we need a comprehensive list of patterns for banner URLs here, and apply the <TT CLASS="LITERAL" ><A HREF="actions-file.html#BLOCK" >block</A ></TT > action to them.</P ><P > First comes many generic patterns, which do most of the work, by matching typical domain and path name components of banners. Then comes a list of individual patterns for specific sites, which is omitted here to keep the example short:</P ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><PRE CLASS="SCREEN" >########################################################################## # Block these fine banners: ########################################################################## { <A HREF="actions-file.html#BLOCK" >+block{Banner ads.}</A > } # Generic patterns: # ad*. .*ads. banner?. count*. /.*count(er)?\.(pl|cgi|exe|dll|asp|php[34]?) /(?:.*/)?(publicite|werbung|rekla(ma|me|am)|annonse|maino(kset|nta|s)?)/ # Site-specific patterns (abbreviated): # .hitbox.com</PRE ></TD ></TR ></TABLE ></P ><P > It's quite remarkable how many advertisers actually call their banner servers ads.<TT CLASS="REPLACEABLE" ><I >company</I ></TT >.com, or call the directory in which the banners are stored simply <SPAN CLASS="QUOTE" >"banners"</SPAN >. So the above generic patterns are surprisingly effective.</P ><P > But being very generic, they necessarily also catch URLs that we don't want to block. The pattern <TT CLASS="LITERAL" >.*ads.</TT > e.g. catches <SPAN CLASS="QUOTE" >"nasty-<SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >ads</I ></SPAN >.nasty-corp.com"</SPAN > as intended, but also <SPAN CLASS="QUOTE" >"downlo<SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >ads</I ></SPAN >.sourcefroge.net"</SPAN > or <SPAN CLASS="QUOTE" >"<SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >ads</I ></SPAN >l.some-provider.net."</SPAN > So here come some well-known exceptions to the <TT CLASS="LITERAL" >+<A HREF="actions-file.html#BLOCK" >block</A ></TT > section above.</P ><P > Note that these are exceptions to exceptions from the default! Consider the URL <SPAN CLASS="QUOTE" >"downloads.sourcefroge.net"</SPAN >: Initially, all actions are deactivated, so it wouldn't get blocked. Then comes the defaults section, which matches the URL, but just deactivates the <TT CLASS="LITERAL" ><A HREF="actions-file.html#BLOCK" >block</A ></TT > action once again. Then it matches <TT CLASS="LITERAL" >.*ads.</TT >, an exception to the general non-blocking policy, and suddenly <TT CLASS="LITERAL" ><A HREF="actions-file.html#BLOCK" >+block</A ></TT > applies. And now, it'll match <TT CLASS="LITERAL" >.*loads.</TT >, where <TT CLASS="LITERAL" ><A HREF="actions-file.html#BLOCK" >-block</A ></TT > applies, so (unless it matches <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >again</I ></SPAN > further down) it ends up with no <TT CLASS="LITERAL" ><A HREF="actions-file.html#BLOCK" >block</A ></TT > action applying.</P ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><PRE CLASS="SCREEN" >########################################################################## # Save some innocent victims of the above generic block patterns: ########################################################################## # By domain: # { -<A HREF="actions-file.html#BLOCK" >block</A > } adv[io]*. # (for advogato.org and advice.*) adsl. # (has nothing to do with ads) adobe. # (has nothing to do with ads either) ad[ud]*. # (adult.* and add.*) .edu # (universities don't host banners (yet!)) .*loads. # (downloads, uploads etc) # By path: # /.*loads/ # Site-specific: # www.globalintersec.com/adv # (adv = advanced) www.ugu.com/sui/ugu/adv</PRE ></TD ></TR ></TABLE ></P ><P > Filtering source code can have nasty side effects, so make an exception for our friends at sourceforge.net, and all paths with <SPAN CLASS="QUOTE" >"cvs"</SPAN > in them. Note that <TT CLASS="LITERAL" >-<A HREF="actions-file.html#FILTER" >filter</A ></TT > disables <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >all</I ></SPAN > filters in one fell swoop!</P ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><PRE CLASS="SCREEN" ># Don't filter code! # { -<A HREF="actions-file.html#FILTER" >filter</A > } /(.*/)?cvs bugzilla. developer. wiki. .sourceforge.net</PRE ></TD ></TR ></TABLE ></P ><P > The actual <TT CLASS="FILENAME" >default.action</TT > is of course much more comprehensive, but we hope this example made clear how it works.</P ></DIV ><DIV CLASS="SECT3" ><H3 CLASS="SECT3" ><A NAME="AEN4292" >8.7.3. user.action</A ></H3 ><P > So far we are painting with a broad brush by setting general policies, which would be a reasonable starting point for many people. Now, you might want to be more specific and have customized rules that are more suitable to your personal habits and preferences. These would be for narrowly defined situations like your ISP or your bank, and should be placed in <TT CLASS="FILENAME" >user.action</TT >, which is parsed after all other actions files and hence has the last word, over-riding any previously defined actions. <TT CLASS="FILENAME" >user.action</TT > is also a <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >safe</I ></SPAN > place for your personal settings, since <TT CLASS="FILENAME" >default.action</TT > is actively maintained by the <SPAN CLASS="APPLICATION" >Privoxy</SPAN > developers and you'll probably want to install updated versions from time to time.</P ><P > So let's look at a few examples of things that one might typically do in <TT CLASS="FILENAME" >user.action</TT >: </P ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><PRE CLASS="SCREEN" ># My user.action file. <fred@example.com></PRE ></TD ></TR ></TABLE ></P ><P > As <A HREF="actions-file.html#ALIASES" >aliases</A > are local to the actions file that they are defined in, you can't use the ones from <TT CLASS="FILENAME" >default.action</TT >, unless you repeat them here:</P ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><PRE CLASS="SCREEN" ># Aliases are local to the file they are defined in. # (Re-)define aliases for this file: # {{alias}} # # These aliases just save typing later, and the alias names should # be self explanatory. # +crunch-all-cookies = +crunch-incoming-cookies +crunch-outgoing-cookies -crunch-all-cookies = -crunch-incoming-cookies -crunch-outgoing-cookies allow-all-cookies = -crunch-all-cookies -session-cookies-only allow-popups = -filter{all-popups} +block-as-image = +block{Blocked as image.} +handle-as-image -block-as-image = -block # These aliases define combinations of actions that are useful for # certain types of sites: # fragile = -block -crunch-all-cookies -filter -fast-redirects -hide-referrer shop = -crunch-all-cookies allow-popups # Allow ads for selected useful free sites: # allow-ads = -block -filter{banners-by-size} -filter{banners-by-link} # Alias for specific file types that are text, but might have conflicting # MIME types. We want the browser to force these to be text documents. handle-as-text = -<A HREF="actions-file.html#FILTER" >filter</A > +-<A HREF="actions-file.html#CONTENT-TYPE-OVERWRITE" >content-type-overwrite{text/plain}</A > +-<A HREF="actions-file.html#FORCE-TEXT-MODE" >force-text-mode</A > -<A HREF="actions-file.html#HIDE-CONTENT-DISPOSITION" >hide-content-disposition</A ></PRE ></TD ></TR ></TABLE > </P ><P > Say you have accounts on some sites that you visit regularly, and you don't want to have to log in manually each time. So you'd like to allow persistent cookies for these sites. The <TT CLASS="LITERAL" >allow-all-cookies</TT > alias defined above does exactly that, i.e. it disables crunching of cookies in any direction, and the processing of cookies to make them only temporary.</P ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><PRE CLASS="SCREEN" >{ allow-all-cookies } sourceforge.net .yahoo.com .msdn.microsoft.com .redhat.com</PRE ></TD ></TR ></TABLE ></P ><P > Your bank is allergic to some filter, but you don't know which, so you disable them all:</P ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><PRE CLASS="SCREEN" >{ -<A HREF="actions-file.html#FILTER" >filter</A > } .your-home-banking-site.com</PRE ></TD ></TR ></TABLE ></P ><P > Some file types you may not want to filter for various reasons:</P ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><PRE CLASS="SCREEN" ># Technical documentation is likely to contain strings that might # erroneously get altered by the JavaScript-oriented filters: # .tldp.org /(.*/)?selfhtml/ # And this stupid host sends streaming video with a wrong MIME type, # so that Privoxy thinks it is getting HTML and starts filtering: # stupid-server.example.com/</PRE ></TD ></TR ></TABLE ></P ><P > Example of a simple <A HREF="actions-file.html#BLOCK" >block</A > action. Say you've seen an ad on your favourite page on example.com that you want to get rid of. You have right-clicked the image, selected <SPAN CLASS="QUOTE" >"copy image location"</SPAN > and pasted the URL below while removing the leading http://, into a <TT CLASS="LITERAL" >{ +block{} }</TT > section. Note that <TT CLASS="LITERAL" >{ +handle-as-image }</TT > need not be specified, since all URLs ending in <TT CLASS="LITERAL" >.gif</TT > will be tagged as images by the general rules as set in default.action anyway:</P ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><PRE CLASS="SCREEN" >{ +<A HREF="actions-file.html#BLOCK" >block</A >{Nasty ads.} } www.example.com/nasty-ads/sponsor\.gif another.example.net/more/junk/here/</PRE ></TD ></TR ></TABLE ></P ><P > The URLs of dynamically generated banners, especially from large banner farms, often don't use the well-known image file name extensions, which makes it impossible for <SPAN CLASS="APPLICATION" >Privoxy</SPAN > to guess the file type just by looking at the URL. You can use the <TT CLASS="LITERAL" >+block-as-image</TT > alias defined above for these cases. Note that objects which match this rule but then turn out NOT to be an image are typically rendered as a <SPAN CLASS="QUOTE" >"broken image"</SPAN > icon by the browser. Use cautiously.</P ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><PRE CLASS="SCREEN" >{ +block-as-image } .doubleclick.net .fastclick.net /Realmedia/ads/ ar.atwola.com/</PRE ></TD ></TR ></TABLE ></P ><P > Now you noticed that the default configuration breaks Forbes Magazine, but you were too lazy to find out which action is the culprit, and you were again too lazy to give <A HREF="contact.html" >feedback</A >, so you just used the <TT CLASS="LITERAL" >fragile</TT > alias on the site, and -- <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >whoa!</I ></SPAN > -- it worked. The <TT CLASS="LITERAL" >fragile</TT > aliases disables those actions that are most likely to break a site. Also, good for testing purposes to see if it is <SPAN CLASS="APPLICATION" >Privoxy</SPAN > that is causing the problem or not. We later find other regular sites that misbehave, and add those to our personalized list of troublemakers:</P ><P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><PRE CLASS="SCREEN" >{ fragile } .forbes.com webmail.example.com .mybank.com</PRE ></TD ></TR ></TABLE ></P ><P > You like the <SPAN CLASS="QUOTE" >"fun"</SPAN > text replacements in <TT CLASS="FILENAME" >default.filter</TT >, but it is disabled in the distributed actions file. So you'd like to turn it on in your private, update-safe config, once and for all:</P ><P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><PRE CLASS="SCREEN" >{ +<A HREF="actions-file.html#FILTER-FUN" >filter{fun}</A > } / # For ALL sites!</PRE ></TD ></TR ></TABLE ></P ><P > Note that the above is not really a good idea: There are exceptions to the filters in <TT CLASS="FILENAME" >default.action</TT > for things that really shouldn't be filtered, like code on CVS->Web interfaces. Since <TT CLASS="FILENAME" >user.action</TT > has the last word, these exceptions won't be valid for the <SPAN CLASS="QUOTE" >"fun"</SPAN > filtering specified here.</P ><P > You might also worry about how your favourite free websites are funded, and find that they rely on displaying banner advertisements to survive. So you might want to specifically allow banners for those sites that you feel provide value to you:</P ><P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><PRE CLASS="SCREEN" >{ allow-ads } .sourceforge.net .slashdot.org .osdn.net</PRE ></TD ></TR ></TABLE > </P ><P > Note that <TT CLASS="LITERAL" >allow-ads</TT > has been aliased to <TT CLASS="LITERAL" >-<A HREF="actions-file.html#BLOCK" >block</A ></TT >, <TT CLASS="LITERAL" >-<A HREF="actions-file.html#FILTER-BANNERS-BY-SIZE" >filter{banners-by-size}</A ></TT >, and <TT CLASS="LITERAL" >-<A HREF="actions-file.html#FILTER-BANNERS-BY-LINK" >filter{banners-by-link}</A ></TT > above.</P ><P > Invoke another alias here to force an over-ride of the MIME type <TT CLASS="LITERAL" > application/x-sh</TT > which typically would open a download type dialog. In my case, I want to look at the shell script, and then I can save it should I choose to.</P ><P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><PRE CLASS="SCREEN" >{ handle-as-text } /.*\.sh$</PRE ></TD ></TR ></TABLE > </P ><P > <TT CLASS="FILENAME" >user.action</TT > is generally the best place to define exceptions and additions to the default policies of <TT CLASS="FILENAME" >default.action</TT >. Some actions are safe to have their default policies set here though. So let's set a default policy to have a <SPAN CLASS="QUOTE" >"blank"</SPAN > image as opposed to the checkerboard pattern for <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >ALL</I ></SPAN > sites. <SPAN CLASS="QUOTE" >"/"</SPAN > of course matches all URL paths and patterns:</P ><P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><PRE CLASS="SCREEN" >{ +<A HREF="actions-file.html#SET-IMAGE-BLOCKER" >set-image-blocker{blank}</A > } / # ALL sites</PRE ></TD ></TR ></TABLE ></P ></DIV ></DIV ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="config.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="filter-file.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >The Main Configuration File</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" > </TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Filter Files</TD ></TR ></TABLE ></DIV ></BODY ></HTML >