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- <div class="SECT1">
- <h1 class="SECT1"><a name="MISC" id="MISC">4. Miscellaneous</a></h1>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="AEN731" id="AEN731">4.1. How much does
- Privoxy slow my browsing down? This has to add extra time to
- browsing.</a></h3>
-
- <p>How much of an impact depends on many things, including the CPU of
- the host system, how aggressive the configuration is, which specific
- actions are being triggered, the size of the page, the bandwidth of the
- connection, etc.</p>
-
- <p>Overall, it should not slow you down any in real terms, and may
- actually help speed things up since ads, banners and other junk are not
- typically being retrieved and displayed. The actual processing time
- required by <span class="APPLICATION">Privoxy</span> itself for each
- page, is relatively small in the overall scheme of things, and happens
- very quickly. This is typically more than offset by time saved not
- downloading and rendering ad images and other junk content (if ad
- blocking is being used).</p>
-
- <p><span class="QUOTE">"Filtering"</span> content via the <tt class=
- "LITERAL"><a href="../user-manual/actions-file.html#FILTER" target=
- "_top">filter</a></tt> or <tt class="LITERAL"><a href=
- "../user-manual/actions-file.html#DEANIMATE-GIFS" target=
- "_top">deanimate-gifs</a></tt> actions may cause a perceived slowdown,
- since the entire document needs to be buffered before displaying. And
- on very large documents, filtering may have some measurable impact. How
- much depends on the page size, the actual definition of the filter(s),
- etc. See below. Most other actions have little to no impact on
- speed.</p>
-
- <p>Also, when filtering is enabled but zlib support isn't available,
- compression is often disabled (see <a href=
- "../user-manual/actions-file.html#PREVENT-COMPRESSION" target=
- "_top">prevent-compression</a>). This can have an impact on speed as
- well, although it's probably smaller than you might think. Again, the
- page size, etc. will determine how much of an impact.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="LOADINGTIMES" id="LOADINGTIMES">4.2. I
- notice considerable delays in page requests. What's wrong?</a></h3>
-
- <p>If you use any <tt class="LITERAL"><a href=
- "../user-manual/actions-file.html#FILTER" target="_top">filter</a></tt>
- action, such as filtering banners by size, web-bugs etc, or the
- <tt class="LITERAL"><a href=
- "../user-manual/actions-file.html#DEANIMATE-GIFS" target=
- "_top">deanimate-gifs</a></tt> action, the entire document must be
- loaded into memory in order for the filtering mechanism to work, and
- nothing is sent to the browser during this time.</p>
-
- <p>The loading time typically does not really change much in real
- numbers, but the feeling is different, because most browsers are able
- to start rendering incomplete content, giving the user a feeling of "it
- works". This effect is more noticeable on slower dialup connections.
- Extremely large documents may have some impact on the time to load the
- page where there is filtering being done. But overall, the difference
- should be very minimal. If there is a big impact, then probably some
- other situation is contributing (like anti-virus software).</p>
-
- <p>Filtering is automatically disabled for inappropriate MIME types.
- But note that if the web server mis-reports the MIME type, then content
- that should not be filtered, could be. <span class=
- "APPLICATION">Privoxy</span> only knows how to differentiate filterable
- content because of the MIME type as reported by the server, or because
- of some configuration setting that enables/disables filtering.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="CONFIGURL" id="CONFIGURL">4.3. What are
- "http://config.privoxy.org/" and "http://p.p/"?</a></h3>
-
- <p><a href="http://config.privoxy.org/" target=
- "_top">http://config.privoxy.org/</a> is the address of <span class=
- "APPLICATION">Privoxy</span>'s built-in user interface, and <a href=
- "http://p.p/" target="_top">http://p.p/</a> is a shortcut for it.</p>
-
- <p>Since <span class="APPLICATION">Privoxy</span> sits between your web
- browser and the Internet, it can simply intercept requests for these
- addresses and answer them with its built-in <span class="QUOTE">"web
- server"</span>.</p>
-
- <p>This also makes for a good test for your browser configuration: If
- entering the URL <a href="http://config.privoxy.org/" target=
- "_top">http://config.privoxy.org/</a> takes you to a page saying
- <span class="QUOTE">"This is Privoxy ..."</span>, everything is OK. If
- you get a page saying <span class="QUOTE">"Privoxy is not
- working"</span> instead, then your browser didn't use <span class=
- "APPLICATION">Privoxy</span> for the request, hence it could not be
- intercepted, and you have accessed the <span class="emphasis"><i class=
- "EMPHASIS">real</i></span> web site at config.privoxy.org.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="NEWADS" id="NEWADS">4.4. How can I submit
- new ads, or report problems?</a></h3>
-
- <p>Please see the <a href="contact.html">Contact section</a> for
- various ways to interact with the developers.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="NEWADS2" id="NEWADS2">4.5. If I do submit
- missed ads, will they be included in future updates?</a></h3>
-
- <p>Whether such submissions are eventually included in the <tt class=
- "FILENAME">default.action</tt> configuration file depends on how
- significant the issue is. We of course want to address any potential
- problem with major, high-profile sites such as <i class=
- "CITETITLE">Google</i>, <i class="CITETITLE">Yahoo</i>, etc. Any site
- with global or regional reach, has a good chance of being a candidate.
- But at the other end of the spectrum are any number of smaller,
- low-profile sites such as for local clubs or schools. Since their reach
- and impact are much less, they are best handled by inclusion in the
- user's <tt class="FILENAME">user.action</tt>, and thus would be
- unlikely to be included.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="NOONECARES" id="NOONECARES">4.6. Why doesn't
- anyone answer my support request?</a></h3>
-
- <p>Rest assured that it has been read and considered. Why it is not
- answered, could be for various reasons, including no one has a good
- answer for it, no one has had time to yet investigate it thoroughly, it
- has been reported numerous times already, or because not enough
- information was provided to help us help you. Your efforts are not
- wasted, and we do appreciate them.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="IP" id="IP">4.7. How can I hide my IP
- address?</a></h3>
-
- <p>If you run both the browser and <span class=
- "APPLICATION">Privoxy</span> locally, you cannot hide your IP address
- with <span class="APPLICATION">Privoxy</span> or ultimately any other
- software alone. The server needs to know your IP address so that it
- knows where to send the responses back.</p>
-
- <p>There are many publicly usable "anonymous" proxies out there, which
- provide a further level of indirection between you and the web
- server.</p>
-
- <p>However, these proxies are called "anonymous" because you don't need
- to authenticate, not because they would offer any real anonymity. Most
- of them will log your IP address and make it available to the
- authorities in case you violate the law of the country they run in. In
- fact you can't even rule out that some of them only exist to *collect*
- information on (those suspicious) people with a more than average
- preference for privacy.</p>
-
- <p>If you want to hide your IP address from most adversaries, you
- should consider chaining <span class="APPLICATION">Privoxy</span> with
- <a href="https://www.torproject.org/" target="_top">Tor</a>. The
- configuration details can be found in <a href="#TOR" target="_top">How
- do I use <span class="APPLICATION">Privoxy</span> together with
- <span class="APPLICATION">Tor</span> section</a> just below.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="AEN796" id="AEN796">4.8. Can Privoxy
- guarantee I am anonymous?</a></h3>
-
- <p>No. Your chances of remaining anonymous are improved, but unless you
- <a href="#TOR" target="_top">chain <span class=
- "APPLICATION">Privoxy</span> with <span class=
- "APPLICATION">Tor</span></a> or a similar proxy and know what you're
- doing when it comes to configuring the rest of your system, you should
- assume that everything you do on the Web can be traced back to you.</p>
-
- <p><span class="APPLICATION">Privoxy</span> can remove various
- information about you, and allows <span class="emphasis"><i class=
- "EMPHASIS">you</i></span> more freedom to decide which sites you can
- trust, and what details you want to reveal. But it neither hides your
- IP address, nor can it guarantee that the rest of the system behaves
- correctly. There are several possibilities how a web sites can find out
- who you are, even if you are using a strict <span class=
- "APPLICATION">Privoxy</span> configuration and chained it with
- <span class="APPLICATION">Tor</span>.</p>
-
- <p>Most of <span class="APPLICATION">Privoxy's</span> privacy-enhancing
- features can be easily subverted by an insecure browser configuration,
- therefore you should use a browser that can be configured to only
- execute code from trusted sites, and be careful which sites you trust.
- For example there is no point in having <span class=
- "APPLICATION">Privoxy</span> modify the User-Agent header, if websites
- can get all the information they want through JavaScript, ActiveX,
- Flash, Java etc.</p>
-
- <p>A few browsers disclose the user's email address in certain
- situations, such as when transferring a file by FTP. <span class=
- "APPLICATION">Privoxy</span> does not filter FTP. If you need this
- feature, or are concerned about the mail handler of your browser
- disclosing your email address, you might consider products such as
- <span class="APPLICATION">NSClean</span>.</p>
-
- <p>Browsers available only as binaries could use non-standard headers
- to give out any information they can have access to: see the
- manufacturer's license agreement. It's impossible to anticipate and
- prevent every breach of privacy that might occur. The professionally
- paranoid prefer browsers available as source code, because anticipating
- their behavior is easier. Trust the source, Luke!</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="AEN814" id="AEN814">4.9. A test site says I
- am not using a Proxy.</a></h3>
-
- <p>Good! Actually, they are probably testing for some other kinds of
- proxies. Hiding yourself completely would require additional steps.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="TOR" id="TOR">4.10. How do I use Privoxy
- together with Tor?</a></h3>
-
- <p>Before you configure <span class="APPLICATION">Privoxy</span> to use
- <a href="https://www.torproject.org/" target="_top">Tor</a>, please
- follow the <i class="CITETITLE">User Manual</i> chapters <a href=
- "../user-manual/installation.html" target="_top">2. Installation</a>
- and <a href="../user-manual/startup.html" target="_top">5. Startup</a>
- to make sure <span class="APPLICATION">Privoxy</span> itself is setup
- correctly.</p>
-
- <p>If it is, refer to <a href=
- "https://www.torproject.org/documentation.html" target="_top">Tor's
- extensive documentation</a> to learn how to install <span class=
- "APPLICATION">Tor</span>, and make sure <span class=
- "APPLICATION">Tor</span>'s logfile says that <span class="QUOTE">"Tor
- has successfully opened a circuit"</span> and it <span class=
- "QUOTE">"looks like client functionality is working"</span>.</p>
-
- <p>If either <span class="APPLICATION">Tor</span> or <span class=
- "APPLICATION">Privoxy</span> isn't working, their combination most
- likely will neither. Testing them on their own will also help you to
- direct problem reports to the right audience. If <span class=
- "APPLICATION">Privoxy</span> isn't working, don't bother the
- <span class="APPLICATION">Tor</span> developers. If <span class=
- "APPLICATION">Tor</span> isn't working, don't send bug reports to the
- <span class="APPLICATION">Privoxy</span> Team.</p>
-
- <p>If you verified that <span class="APPLICATION">Privoxy</span> and
- <span class="APPLICATION">Tor</span> are working, it is time to connect
- them. As far as <span class="APPLICATION">Privoxy</span> is concerned,
- <span class="APPLICATION">Tor</span> is just another proxy that can be
- reached by socks4, socks4a and socks5. Most likely you are interested
- in <span class="APPLICATION">Tor</span> to increase your anonymity
- level, therefore you should use socks5, to make sure DNS requests are
- done through <span class="APPLICATION">Tor</span> and thus invisible to
- your local network. Using socks4a would work too, but with socks5 you
- get more precise error messages.</p>
-
- <p><span class="APPLICATION">Privoxy's</span> <a href=
- "../user-manual/config.html" target="_top">main configuration file</a>
- is already prepared for <span class="APPLICATION">Tor</span>, if you
- are using a default <span class="APPLICATION">Tor</span> configuration
- and run it on the same system as <span class=
- "APPLICATION">Privoxy</span>, you just have to edit the <a href=
- "../user-manual/config.html#FORWARDING" target="_top">forwarding
- section</a> and uncomment the line:</p>
-
- <table border="0" bgcolor="#E0E0E0" width="100%">
- <tr>
- <td>
- <pre class="SCREEN">
-# forward-socks5t / 127.0.0.1:9050 .
-
-</pre>
- </td>
- </tr>
- </table>
-
- <p>Note that if you got Tor through one of the bundles, you may have to
- change the port from 9050 to 9150 (or even another one). For details,
- please check the documentation on the <a href="https://torproject.org/"
- target="_top">Tor website</a>.</p>
-
- <p>This is enough to reach the Internet, but additionally you might
- want to uncomment the following forward rules, to make sure your local
- network is still reachable through Privoxy:</p>
-
- <table border="0" bgcolor="#E0E0E0" width="100%">
- <tr>
- <td>
- <pre class="SCREEN">
-# forward 192.168.*.*/ .
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">
+<HTML
+><HEAD
+><TITLE
+>Miscellaneous</TITLE
+><META
+NAME="GENERATOR"
+CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK
+REL="HOME"
+TITLE="Privoxy Frequently Asked Questions"
+HREF="index.html"><LINK
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+TITLE="Configuration"
+HREF="configuration.html"><LINK
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+charset=ISO-8859-1"></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 Frequently Asked Questions</TH
+></TR
+><TR
+><TD
+WIDTH="10%"
+ALIGN="left"
+VALIGN="bottom"
+><A
+HREF="configuration.html"
+ACCESSKEY="P"
+>Prev</A
+></TD
+><TD
+WIDTH="80%"
+ALIGN="center"
+VALIGN="bottom"
+></TD
+><TD
+WIDTH="10%"
+ALIGN="right"
+VALIGN="bottom"
+><A
+HREF="trouble.html"
+ACCESSKEY="N"
+>Next</A
+></TD
+></TR
+></TABLE
+><HR
+ALIGN="LEFT"
+WIDTH="100%"></DIV
+><DIV
+CLASS="SECT1"
+><H1
+CLASS="SECT1"
+><A
+NAME="MISC"
+>4. Miscellaneous</A
+></H1
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="SLOWSME"
+>4.1. How much does Privoxy slow my browsing down? This
+has to add extra time to browsing.</A
+></H3
+><P
+> How much of an impact depends on many things, including the CPU of the host
+ system, how aggressive the configuration is, which specific actions are being triggered,
+ the size of the page, the bandwidth of the connection, etc.</P
+><P
+> Overall, it should not slow you down any in real terms, and may actually help
+ speed things up since ads, banners and other junk are not typically being
+ retrieved and displayed. The actual processing time required by
+ <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> itself for each page, is relatively small
+ in the overall scheme of things, and happens very quickly. This is typically
+ more than offset by time saved not downloading and rendering ad images and
+ other junk content (if ad blocking is being used).</P
+><P
+> <SPAN
+CLASS="QUOTE"
+>"Filtering"</SPAN
+> content via the <TT
+CLASS="LITERAL"
+><A
+HREF="../user-manual/actions-file.html#FILTER"
+TARGET="_top"
+>filter</A
+></TT
+> or
+ <TT
+CLASS="LITERAL"
+><A
+HREF="../user-manual/actions-file.html#DEANIMATE-GIFS"
+TARGET="_top"
+>deanimate-gifs</A
+></TT
+>
+ actions may cause a perceived slowdown, since the entire document
+ needs to be buffered before displaying. And on very large documents,
+ filtering may have some measurable impact. How much depends on the page size,
+ the actual definition of the filter(s), etc. See below. Most other actions
+ have little to no impact on speed.</P
+><P
+> Also, when filtering is enabled but zlib support isn't available, compression
+ is often disabled (see <A
+HREF="../user-manual/actions-file.html#PREVENT-COMPRESSION"
+TARGET="_top"
+>prevent-compression</A
+>).
+ This can have an impact on speed as well, although it's probably smaller than
+ you might think. Again, the page size, etc. will determine how much of an impact.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="LOADINGTIMES"
+>4.2. I notice considerable
+delays in page requests. What's wrong?</A
+></H3
+><P
+> If you use any <TT
+CLASS="LITERAL"
+><A
+HREF="../user-manual/actions-file.html#FILTER"
+TARGET="_top"
+>filter</A
+></TT
+> action,
+ such as filtering banners by size, web-bugs etc, or the <TT
+CLASS="LITERAL"
+><A
+HREF="../user-manual/actions-file.html#DEANIMATE-GIFS"
+TARGET="_top"
+>deanimate-gifs</A
+></TT
+>
+ action, the entire document must be loaded into memory in order for the filtering
+ mechanism to work, and nothing is sent to the browser during this time.</P
+><P
+> The loading time typically does not really change much in real numbers, but
+ the feeling is different, because most browsers are able to start rendering
+ incomplete content, giving the user a feeling of "it works". This effect is
+ more noticeable on slower dialup connections. Extremely large documents
+ may have some impact on the time to load the page where there is filtering
+ being done. But overall, the difference should be very minimal. If there is a
+ big impact, then probably some other situation is contributing (like
+ anti-virus software).
+ </P
+><P
+> Filtering is automatically disabled for inappropriate MIME types. But note
+ that if the web server mis-reports the MIME type, then content that should
+ not be filtered, could be. <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> only knows how
+ to differentiate filterable content because of the MIME type as reported by
+ the server, or because of some configuration setting that enables/disables
+ filtering.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="CONFIGURL"
+>4.3. What are "http://config.privoxy.org/" and
+"http://p.p/"?</A
+></H3
+><P
+> <A
+HREF="http://config.privoxy.org/"
+TARGET="_top"
+>http://config.privoxy.org/</A
+> is the
+ address of <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+>'s built-in user interface, and
+ <A
+HREF="http://p.p/"
+TARGET="_top"
+>http://p.p/</A
+> is a shortcut for it.</P
+><P
+> Since <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> sits between your web browser and the Internet,
+ it can simply intercept requests for these addresses and answer them with its built-in
+ <SPAN
+CLASS="QUOTE"
+>"web server"</SPAN
+>.</P
+><P
+> This also makes for a good test for your browser configuration: If entering the
+ URL <A
+HREF="http://config.privoxy.org/"
+TARGET="_top"
+>http://config.privoxy.org/</A
+>
+ takes you to a page saying <SPAN
+CLASS="QUOTE"
+>"This is Privoxy ..."</SPAN
+>, everything is OK.
+ If you get a page saying <SPAN
+CLASS="QUOTE"
+>"Privoxy is not working"</SPAN
+> instead, then
+ your browser didn't use <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> for the request,
+ hence it could not be intercepted, and you have accessed the <SPAN
+CLASS="emphasis"
+><I
+CLASS="EMPHASIS"
+>real</I
+></SPAN
+>
+ web site at config.privoxy.org.</P
+><P
+> Note that config.privoxy.org resolves to a public IP address.
+ If you use config.privoxy.org as ping or traceroute target you will
+ reach the system on the Internet (Privoxy can't intercept ICMP requests).
+ If you want to ping the system Privoxy runs on,
+ you should use its IP address or local DNS name (if it has got one).</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="NEWADS"
+>4.4. How can I submit new ads, or report
+problems?</A
+></H3
+><P
+>Please see the <A
+HREF="contact.html"
+>Contact section</A
+> for
+various ways to interact with the developers.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="NEWADS2"
+>4.5. If I do submit missed ads, will
+they be included in future updates?</A
+></H3
+><P
+> Whether such submissions are eventually included in the
+ <TT
+CLASS="FILENAME"
+>default.action</TT
+> configuration file depends on how
+ significant the issue is. We of course want to address any potential
+ problem with major, high-profile sites such as <I
+CLASS="CITETITLE"
+>Google</I
+>,
+ <I
+CLASS="CITETITLE"
+>Yahoo</I
+>, etc. Any site with global or regional reach,
+ has a good chance of being a candidate. But at the other end of the spectrum
+ are any number of smaller, low-profile sites such as for local clubs or
+ schools. Since their reach and impact are much less, they are best handled by
+ inclusion in the user's <TT
+CLASS="FILENAME"
+>user.action</TT
+>, and thus would be
+ unlikely to be included.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="NOONECARES"
+>4.6. Why doesn't anyone answer my support
+request?</A
+></H3
+><P
+>Rest assured that it has been read and considered. Why it is not answered,
+could be for various reasons, including no one has a good answer for it, no
+one has had time to yet investigate it thoroughly, it has been reported
+numerous times already, or because not enough information was provided to help
+us help you. Your efforts are not wasted, and we do appreciate them.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="IP"
+>4.7. How can I hide my IP address?</A
+></H3
+><P
+> If you run both the browser and <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> locally, you cannot hide your IP
+ address with <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> or ultimately any other
+ software alone. The server needs to know your IP address so that it knows
+ where to send the responses back.</P
+><P
+> There are many publicly usable "anonymous" proxies out there, which
+ provide a further level of indirection between you and the web server.</P
+><P
+> However, these proxies are called "anonymous" because you don't need
+ to authenticate, not because they would offer any real anonymity.
+ Most of them will log your IP address and make it available to the
+ authorities in case you violate the law of the country they run in. In fact
+ you can't even rule out that some of them only exist to *collect* information
+ on (those suspicious) people with a more than average preference for privacy.</P
+><P
+> If you want to hide your IP address from most adversaries,
+ you should consider chaining <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+>
+ with <A
+HREF="https://www.torproject.org/"
+TARGET="_top"
+>Tor</A
+>.
+ The configuration details can be found in
+ <A
+HREF="#TOR"
+TARGET="_top"
+>How do I use <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> together
+ with <SPAN
+CLASS="APPLICATION"
+>Tor</SPAN
+> section</A
+>
+ just below.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="ANONFORSURE"
+>4.8. Can Privoxy guarantee I am anonymous?</A
+></H3
+><P
+> No. Your chances of remaining anonymous are improved, but unless you
+ <A
+HREF="#TOR"
+TARGET="_top"
+>chain <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> with <SPAN
+CLASS="APPLICATION"
+>Tor</SPAN
+></A
+>
+ or a similar proxy and know what you're doing when it comes to configuring
+ the rest of your system, you should assume that everything you do
+ on the Web can be traced back to you.</P
+><P
+> <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> can remove various information about you,
+ and allows <SPAN
+CLASS="emphasis"
+><I
+CLASS="EMPHASIS"
+>you</I
+></SPAN
+> more freedom to decide which sites
+ you can trust, and what details you want to reveal. But it neither
+ hides your IP address, nor can it guarantee that the rest of the system
+ behaves correctly. There are several possibilities how a web sites can find
+ out who you are, even if you are using a strict <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+>
+ configuration and chained it with <SPAN
+CLASS="APPLICATION"
+>Tor</SPAN
+>.</P
+><P
+> Most of <SPAN
+CLASS="APPLICATION"
+>Privoxy's</SPAN
+> privacy-enhancing features can be easily subverted
+ by an insecure browser configuration, therefore you should use a browser that can
+ be configured to only execute code from trusted sites, and be careful which sites you trust.
+ For example there is no point in having <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+>
+ modify the User-Agent header, if websites can get all the information they want
+ through JavaScript, ActiveX, Flash, Java etc.</P
+><P
+> A few browsers disclose the user's email address in certain situations, such
+ as when transferring a file by FTP. <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+>
+ does not filter FTP. If you need this feature, or are concerned about the
+ mail handler of your browser disclosing your email address, you might
+ consider products such as <SPAN
+CLASS="APPLICATION"
+>NSClean</SPAN
+>.</P
+><P
+> Browsers available only as binaries could use non-standard headers to give
+ out any information they can have access to: see the manufacturer's license
+ agreement. It's impossible to anticipate and prevent every breach of privacy
+ that might occur. The professionally paranoid prefer browsers available as
+ source code, because anticipating their behavior is easier. Trust the source,
+ Luke!</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="PROXYTEST"
+>4.9. A test site says I am not using a Proxy.</A
+></H3
+><P
+> Good! Actually, they are probably testing for some other kinds of proxies.
+ Hiding yourself completely would require additional steps.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="TOR"
+>4.10. How do I use Privoxy
+ together with Tor?</A
+></H3
+><P
+> Before you configure <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> to use
+ <A
+HREF="https://www.torproject.org/"
+TARGET="_top"
+>Tor</A
+>,
+ please follow the <I
+CLASS="CITETITLE"
+>User Manual</I
+> chapters
+ <A
+HREF="../user-manual/installation.html"
+TARGET="_top"
+>2. Installation</A
+> and
+ <A
+HREF="../user-manual/startup.html"
+TARGET="_top"
+>5. Startup</A
+> to make sure
+ <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> itself is setup correctly.</P
+><P
+> If it is, refer to <A
+HREF="https://www.torproject.org/documentation.html"
+TARGET="_top"
+>Tor's
+ extensive documentation</A
+> to learn how to install <SPAN
+CLASS="APPLICATION"
+>Tor</SPAN
+>,
+ and make sure <SPAN
+CLASS="APPLICATION"
+>Tor</SPAN
+>'s logfile says that
+ <SPAN
+CLASS="QUOTE"
+>"Tor has successfully opened a circuit"</SPAN
+> and it
+ <SPAN
+CLASS="QUOTE"
+>"looks like client functionality is working"</SPAN
+>.</P
+><P
+> If either <SPAN
+CLASS="APPLICATION"
+>Tor</SPAN
+> or <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+>
+ isn't working, their combination most likely will neither. Testing them on their
+ own will also help you to direct problem reports to the right audience.
+ If <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> isn't working, don't bother the
+ <SPAN
+CLASS="APPLICATION"
+>Tor</SPAN
+> developers. If <SPAN
+CLASS="APPLICATION"
+>Tor</SPAN
+>
+ isn't working, don't send bug reports to the <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> Team.</P
+><P
+> If you verified that <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> and <SPAN
+CLASS="APPLICATION"
+>Tor</SPAN
+>
+ are working, it is time to connect them. As far as <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+>
+ is concerned, <SPAN
+CLASS="APPLICATION"
+>Tor</SPAN
+> is just another proxy that can be reached
+ by socks4, socks4a and socks5. Most likely you are interested in <SPAN
+CLASS="APPLICATION"
+>Tor</SPAN
+>
+ to increase your anonymity level, therefore you should use socks5, to make sure DNS
+ requests are done through <SPAN
+CLASS="APPLICATION"
+>Tor</SPAN
+> and thus invisible to your
+ local network. Using socks4a would work too, but with socks5 you get more precise error
+ messages.</P
+><P
+> <SPAN
+CLASS="APPLICATION"
+>Privoxy's</SPAN
+>
+ <A
+HREF="../user-manual/config.html"
+TARGET="_top"
+>main configuration file</A
+>
+ is already prepared for <SPAN
+CLASS="APPLICATION"
+>Tor</SPAN
+>, if you are using a
+ default <SPAN
+CLASS="APPLICATION"
+>Tor</SPAN
+> configuration and run it on the same
+ system as <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+>, you just have to edit the
+ <A
+HREF="../user-manual/config.html#FORWARDING"
+TARGET="_top"
+>forwarding section</A
+>
+ and uncomment the line:</P
+><TABLE
+BORDER="0"
+BGCOLOR="#E0E0E0"
+WIDTH="100%"
+><TR
+><TD
+><PRE
+CLASS="SCREEN"
+># forward-socks5t / 127.0.0.1:9050 .
+ </PRE
+></TD
+></TR
+></TABLE
+><P
+> Note that if you got Tor through one of the bundles, you may
+ have to change the port from 9050 to 9150 (or even another one).
+ For details, please check the documentation on the
+ <A
+HREF="https://torproject.org/"
+TARGET="_top"
+>Tor website</A
+>.</P
+><P
+> This is enough to reach the Internet, but additionally you might want to
+ uncomment the following forward rules, to make sure your local network is still
+ reachable through Privoxy:</P
+><TABLE
+BORDER="0"
+BGCOLOR="#E0E0E0"
+WIDTH="100%"
+><TR
+><TD
+><PRE
+CLASS="SCREEN"
+># forward 192.168.*.*/ .
# forward 10.*.*.*/ .
# forward 127.*.*.*/ .
-
-</pre>
- </td>
- </tr>
- </table>
-
- <p>Unencrypted connections to systems in these address ranges will be
- as (un)secure as the local network is, but the alternative is that your
- browser can't reach the network at all. Then again, that may actually
- be desired and if you don't know for sure that your browser has to be
- able to reach the local network, there's no reason to allow it.</p>
-
- <p>If you want your browser to be able to reach servers in your local
- network by using their names, you will need additional exceptions that
- look like this:</p>
-
- <table border="0" bgcolor="#E0E0E0" width="100%">
- <tr>
- <td>
- <pre class="SCREEN">
-# forward localhost/ .
-
-</pre>
- </td>
- </tr>
- </table>
-
- <p>Save the modified configuration file and open <a href=
- "http://config.privoxy.org/show-status" target=
- "_top">http://config.privoxy.org/show-status</a> in your browser,
- confirm that <span class="APPLICATION">Privoxy</span> has reloaded its
- configuration and that there are no other forward lines, unless you
- know that you need them. If everything looks good, refer to <a href=
- "https://wiki.torproject.org/noreply/TheOnionRouter/TorFAQ#IsMyConnectionPrivate"
- target="_top">Tor Faq 4.2</a> to learn how to verify that you are
- really using <span class="APPLICATION">Tor</span>.</p>
-
- <p>Afterward, please take the time to at least skim through the rest of
- <span class="APPLICATION">Tor's</span> documentation. Make sure you
- understand what <span class="APPLICATION">Tor</span> does, why it is no
- replacement for application level security, and why you probably don't
- want to use it for unencrypted logins.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="AEN872" id="AEN872">4.11. Might some things
- break because header information or content is being altered?</a></h3>
-
- <p>Definitely. It is common for sites to use browser type, browser
- version, HTTP header content, and various other techniques in order to
- dynamically decide what to display and how to display it. What you see,
- and what I see, might be very different. There are many, many ways that
- this can be handled, so having hard and fast rules, is tricky.</p>
-
- <p>The <span class="QUOTE">"User-Agent"</span> is sometimes used in
- this way to identify the browser, and adjust content accordingly.</p>
-
- <p>Also, different browsers use different encodings of non-English
- characters, certain web servers convert pages on-the-fly according to
- the User Agent header. Giving a <span class="QUOTE">"User Agent"</span>
- with the wrong operating system or browser manufacturer causes some
- sites in these languages to be garbled; Surfers to Eastern European
- sites should change it to something closer. And then some page access
- counters work by looking at the <span class="QUOTE">"Referer"</span>
- header; they may fail or break if unavailable. The weather maps of
- Intellicast have been blocked by their server when no <span class=
- "QUOTE">"Referer"</span> or cookie is provided, is another example.
- (But you can forge both headers without giving information away). There
- are many other ways things can go wrong when trying to fool a web
- server. The results of which could inadvertently cause pages to load
- incorrectly, partially, or even not at all. And there may be no obvious
- clues as to just what went wrong, or why. Nowhere will there be a
- message that says <span class="QUOTE">"<span class="emphasis"><i class=
- "EMPHASIS">Turn off <tt class="LITERAL">fast-redirects</tt> or
- else!</i></span> "</span></p>
-
- <p>Similar thoughts apply to modifying JavaScript, and, to a lesser
- degree, HTML elements.</p>
-
- <p>If you have problems with a site, you will have to adjust your
- configuration accordingly. Cookies are probably the most likely
- adjustment that may be required, but by no means the only one.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="AEN886" id="AEN886">4.12. Can Privoxy act as
- a <span class="QUOTE">"caching"</span> proxy to speed up web
- browsing?</a></h3>
-
- <p>No, it does not have this ability at all. You want something like
- <a href="http://www.squid-cache.org/" target="_top">Squid</a> or
- <a href="http://www.pps.jussieu.fr/~jch/software/polipo/" target=
- "_top">Polipo</a> for this. And, yes, before you ask, <span class=
- "APPLICATION">Privoxy</span> can co-exist with other kinds of proxies
- like <span class="APPLICATION">Squid</span>. See the <a href=
- "../user-manual/config.html#FORWARDING" target="_top">forwarding
- chapter</a> in the <a href="../user-manual/index.html" target=
- "_top">user manual</a> for details.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="AEN896" id="AEN896">4.13. What about as a
- firewall? Can Privoxy protect me?</a></h3>
-
- <p>Not in the way you mean, or in the way some firewall vendors claim
- they can. <span class="APPLICATION">Privoxy</span> can help protect
- your privacy, but can't protect your system from intrusion attempts. It
- is, of course, perfectly possible to use <span class=
- "emphasis"><i class="EMPHASIS">both</i></span>.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="AEN901" id="AEN901">4.14. I have large empty
- spaces / a checkerboard pattern now where ads used to be. Why?</a></h3>
-
- <p>It is technically possible to eliminate banners and ads in a way
- that frees their allocated page space. This could easily be done by
- blocking with <span class="APPLICATION">Privoxy's</span> filters, and
- eliminating the <span class="emphasis"><i class=
- "EMPHASIS">entire</i></span> image references from the HTML page
- source.</p>
-
- <p>But, this would consume considerably more CPU resources (IOW, slow
- things down), would likely destroy the layout of some web pages which
- rely on the banners utilizing a certain amount of page space, and might
- fail in other cases, where the screen space is reserved (e.g. by HTML
- tables for instance). Also, making ads and banners disappear without
- any trace complicates troubleshooting, and would sooner or later be
- problematic.</p>
-
- <p>The better alternative is to instead let them stay, and block the
- resulting requests for the banners themselves as is now the case. This
- leaves either empty space, or the familiar checkerboard pattern.</p>
-
- <p>So the developers won't support this in the default configuration,
- but you can of course define appropriate filters yourself to achieve
- this.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="AEN909" id="AEN909">4.15. How can Privoxy
- filter Secure (HTTPS) URLs?</a></h3>
-
- <p>Since secure HTTP connections are encrypted SSL sessions between
- your browser and the secure site, and are meant to be reliably
- <span class="emphasis"><i class="EMPHASIS">secure</i></span>, there is
- little that <span class="APPLICATION">Privoxy</span> can do but hand
- the raw gibberish data though from one end to the other
- unprocessed.</p>
-
- <p>The only exception to this is blocking by host patterns, as the
- client needs to tell <span class="APPLICATION">Privoxy</span> the name
- of the remote server, so that <span class="APPLICATION">Privoxy</span>
- can establish the connection. If that name matches a host-only pattern,
- the connection will be blocked.</p>
-
- <p>As far as ad blocking is concerned, this is less of a restriction
- than it may seem, since ad sources are often identifiable by the host
- name, and often the banners to be placed in an encrypted page come
- unencrypted nonetheless for efficiency reasons, which exposes them to
- the full power of <span class="APPLICATION">Privoxy</span>'s ad
- blocking.</p>
-
- <p><span class="QUOTE">"Content cookies"</span> (those that are
- embedded in the actual HTML or JS page content, see <tt class=
- "LITERAL"><a href=
- "../user-manual/actions-file.html#FILTER-CONTENT-COOKIES" target=
- "_top">filter{content-cookies}</a></tt>), in an SSL transaction will be
- impossible to block under these conditions. Fortunately, this does not
- seem to be a very common scenario since most cookies come by
- traditional means.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="AEN923" id="AEN923">4.16. Privoxy runs as a
- <span class="QUOTE">"server"</span>. How secure is it? Do I need to
- take any special precautions?</a></h3>
-
- <p>On Unix-like systems, <span class="APPLICATION">Privoxy</span> can
- run as a non-privileged user, which is how we recommend it be run.
- Also, by default <span class="APPLICATION">Privoxy</span> listens to
- requests from <span class="QUOTE">"localhost"</span> only.</p>
-
- <p>The server aspect of <span class="APPLICATION">Privoxy</span> is not
- itself directly exposed to the Internet in this configuration. If you
- want to have <span class="APPLICATION">Privoxy</span> serve as a LAN
- proxy, this will have to be opened up to allow for LAN requests. In
- this case, we'd recommend you specify only the LAN gateway address,
- e.g. 192.168.1.1, in the main <span class="APPLICATION">Privoxy</span>
- configuration file and check all <a href=
- "../user-manual/config.html#ACCESS-CONTROL" target="_top">access
- control and security options</a>. All LAN hosts can then use this as
- their proxy address in the browser proxy configuration, but
- <span class="APPLICATION">Privoxy</span> will not listen on any
- external interfaces. ACLs can be defined in addition, and using a
- firewall is always good too. Better safe than sorry.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="TURNOFF" id="TURNOFF">4.17. Can I
- temporarily disable Privoxy?</a></h3>
-
- <p><span class="APPLICATION">Privoxy</span> doesn't have a transparent
- proxy mode, but you can toggle off blocking and content filtering.</p>
-
- <p>The easiest way to do that is to point your browser to the remote
- toggle URL: <a href="http://config.privoxy.org/toggle" target=
- "_top">http://config.privoxy.org/toggle</a>.</p>
-
- <p>See the <a href="../user-manual/appendix.html#BOOKMARKLETS" target=
- "_top">Bookmarklets section</a> of the <i class="CITETITLE">User
- Manual</i> for an easy way to access this feature. Note that this is a
- feature that may need to be enabled in the main <tt class=
- "FILENAME">config</tt> file.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="REALLYOFF" id="REALLYOFF">4.18. When
- <span class="QUOTE">"disabled"</span> is Privoxy totally out of the
- picture?</a></h3>
-
- <p>No, this just means all optional filtering and actions are disabled.
- <span class="APPLICATION">Privoxy</span> is still acting as a proxy,
- but just doing less of the things that <span class=
- "APPLICATION">Privoxy</span> would normally be expected to do. It is
- still a <span class="QUOTE">"middle-man"</span> in the interaction
- between your browser and web sites. See below to bypass the proxy.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="TURNOFF2" id="TURNOFF2">4.19. How can I tell
- Privoxy to totally ignore certain sites?</a></h3>
-
- <p>Bypassing a proxy, or proxying based on arbitrary criteria, is
- purely a browser configuration issue, not a <span class=
- "APPLICATION">Privoxy</span> issue. Modern browsers typically do have
- settings for not proxying certain sites. Check your browser's help
- files.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="CRUNCH" id="CRUNCH">4.20. My logs show
- Privoxy <span class="QUOTE">"crunches"</span> ads, but also its own
- internal CGI pages. What is a <span class=
- "QUOTE">"crunch"</span>?</a></h3>
-
- <p>A <span class="QUOTE">"crunch"</span> simply means <span class=
- "APPLICATION">Privoxy</span> intercepted <span class=
- "emphasis"><i class="EMPHASIS">something</i></span>, nothing more.
- Often this is indeed ads or banners, but <span class=
- "APPLICATION">Privoxy</span> uses the same mechanism for trapping
- requests for its own internal pages. For instance, a request for
- <span class="APPLICATION">Privoxy's</span> configuration page at:
- <a href="http://config.privoxy.org" target=
- "_top">http://config.privoxy.org</a>, is intercepted (i.e. it does not
- go out to the 'net), and the familiar CGI configuration is returned to
- the browser, and the log consequently will show a <span class=
- "QUOTE">"crunch"</span>.</p>
-
- <p>Since version 3.0.7, Privoxy will also log the crunch reason. If you
- are using an older version you might want to upgrade.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="DOWNLOADS" id="DOWNLOADS">4.21. Can Privoxy
- effect files that I download from a webserver? FTP server?</a></h3>
-
- <p>From the webserver's perspective, there is no difference between
- viewing a document (i.e. a page), and downloading a file. The same is
- true of <span class="APPLICATION">Privoxy</span>. If there is a match
- for a <tt class="LITERAL"><a href=
- "../user-manual/actions-file.html#BLOCK" target="_top">block</a></tt>
- pattern, it will still be blocked, and of course this is obvious.</p>
-
- <p>Filtering is potentially more of a concern since the results are not
- always so obvious, and the effects of filtering are there whether the
- file is simply viewed, or downloaded. And potentially whether the
- content is some obnoxious advertisement, or Mr. Jimmy's latest/greatest
- source code jewel. Of course, one of these presumably is <span class=
- "QUOTE">"bad"</span> content that we don't want, and the other is
- <span class="QUOTE">"good"</span> content that we do want. <span class=
- "APPLICATION">Privoxy</span> is blind to the differences, and can only
- distinguish <span class="QUOTE">"good from bad"</span> by the
- configuration parameters <span class="emphasis"><i class=
- "EMPHASIS">we</i></span> give it.</p>
-
- <p><span class="APPLICATION">Privoxy</span> knows the differences in
- files according to the <span class="QUOTE">"Content Type"</span> as
- reported by the webserver. If this is reported accurately (e.g.
- <span class="QUOTE">"application/zip"</span> for a zip archive), then
- <span class="APPLICATION">Privoxy</span> knows to ignore these where
- appropriate. <span class="APPLICATION">Privoxy</span> potentially can
- filter HTML as well as plain text documents, subject to configuration
- parameters of course. Also, documents that are of an unknown type
- (generally assumed to be <span class="QUOTE">"text/plain"</span>) can
- be filtered, as will those that might be incorrectly reported by the
- webserver. If such a file is a downloaded file that is intended to be
- saved to disk, then any content that might have been altered by
- filtering, will be saved too, for these (probably rare) cases.</p>
-
- <p>Note that versions later than 3.0.2 do NOT filter document types
- reported as <span class="QUOTE">"text/plain"</span>. Prior to this,
- <span class="APPLICATION">Privoxy</span> did filter this document
- type.</p>
-
- <p>In short, filtering is <span class="QUOTE">"ON"</span> if a) the
- content type as reported by the webserver is appropriate <span class=
- "emphasis"><i class="EMPHASIS">and</i></span> b) the configuration
- allows it (or at least does not disallow it). That's it. There is no
- magic cookie anywhere to say this is <span class="QUOTE">"good"</span>
- and this is <span class="QUOTE">"bad"</span>. It's the configuration
- that lets it all happen or not.</p>
-
- <p>If you download text files, you probably do not want these to be
- filtered, particularly if the content is source code, or other critical
- content. Source code sometimes might be mistaken for Javascript (i.e.
- the kind that might open a pop-up window). It is recommended to turn
- off filtering for download sites (particularly if the content may be
- plain text files and you are using version 3.0.2 or earlier) in your
- <tt class="FILENAME">user.action</tt> file. And also, for any site or
- page where making <span class="emphasis"><i class=
- "EMPHASIS">any</i></span> changes at all to the content is to be
- avoided.</p>
-
- <p><span class="APPLICATION">Privoxy</span> does not do FTP at all,
- only HTTP and HTTPS (SSL) protocols.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="DOWNLOADS2" id="DOWNLOADS2">4.22. I just
- downloaded a Perl script, and Privoxy altered it! Yikes, what is
- wrong!</a></h3>
-
- <p>Please read above.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="HOSTSFILE" id="HOSTSFILE">4.23. Should I
- continue to use a <span class="QUOTE">"HOSTS"</span> file for
- ad-blocking?</a></h3>
-
- <p>One time-tested technique to defeat common ads is to trick the local
- DNS system by giving a phony IP address for the ad generator in the
- local <tt class="FILENAME">HOSTS</tt> file, typically using <tt class=
- "LITERAL">127.0.0.1</tt>, aka <tt class="LITERAL">localhost</tt>. This
- effectively blocks the ad.</p>
-
- <p>There is no reason to use this technique in conjunction with
- <span class="APPLICATION">Privoxy</span>. <span class=
- "APPLICATION">Privoxy</span> does essentially the same thing, much more
- elegantly and with much more flexibility. A large <tt class=
- "FILENAME">HOSTS</tt> file, in fact, not only duplicates effort, but
- may get in the way and seriously slow down your system. It is
- recommended to remove such entries from your <tt class=
- "FILENAME">HOSTS</tt> file. If you think your hosts list is neglected
- by <span class="APPLICATION">Privoxy's</span> configuration, consider
- adding your list to your <tt class="FILENAME">user.action</tt>
- file:</p>
-
- <table border="0" bgcolor="#E0E0E0" width="100%">
- <tr>
- <td>
- <pre class="SCREEN">
- { +block }
+ </PRE
+></TD
+></TR
+></TABLE
+><P
+> Unencrypted connections to systems in these address ranges will
+ be as (un)secure as the local network is, but the alternative is
+ that your browser can't reach the network at all. Then again,
+ that may actually be desired and if you don't know for sure
+ that your browser has to be able to reach the local network,
+ there's no reason to allow it.</P
+><P
+> If you want your browser to be able to reach servers in your local
+ network by using their names, you will need additional exceptions
+ that look like this:</P
+><TABLE
+BORDER="0"
+BGCOLOR="#E0E0E0"
+WIDTH="100%"
+><TR
+><TD
+><PRE
+CLASS="SCREEN"
+># forward localhost/ .
+ </PRE
+></TD
+></TR
+></TABLE
+><P
+> Save the modified configuration file and open
+ <A
+HREF="http://config.privoxy.org/show-status"
+TARGET="_top"
+>http://config.privoxy.org/show-status</A
+>
+ in your browser, confirm that <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> has reloaded its configuration
+ and that there are no other forward lines, unless you know that you need them. If everything looks good,
+ refer to
+ <A
+HREF="https://wiki.torproject.org/noreply/TheOnionRouter/TorFAQ#IsMyConnectionPrivate"
+TARGET="_top"
+>Tor
+ Faq 4.2</A
+> to learn how to verify that you are really using <SPAN
+CLASS="APPLICATION"
+>Tor</SPAN
+>.</P
+><P
+> Afterward, please take the time to at least skim through the rest
+ of <SPAN
+CLASS="APPLICATION"
+>Tor's</SPAN
+> documentation. Make sure you understand
+ what <SPAN
+CLASS="APPLICATION"
+>Tor</SPAN
+> does, why it is no replacement for
+ application level security, and why you probably don't want to
+ use it for unencrypted logins.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="SITEBREAK"
+>4.11. Might some things break because header information or
+content is being altered?</A
+></H3
+><P
+> Definitely. It is common for sites to use browser type, browser version,
+ HTTP header content, and various other techniques in order to dynamically
+ decide what to display and how to display it. What you see, and what I see,
+ might be very different. There are many, many ways that this can be handled,
+ so having hard and fast rules, is tricky.</P
+><P
+> The <SPAN
+CLASS="QUOTE"
+>"User-Agent"</SPAN
+> is sometimes used in this way to identify
+ the browser, and adjust content accordingly.</P
+><P
+> Also, different browsers use different encodings of non-English
+ characters, certain web servers convert pages on-the-fly according to the
+ User Agent header. Giving a <SPAN
+CLASS="QUOTE"
+>"User Agent"</SPAN
+> with the wrong
+ operating system or browser manufacturer causes some sites in these languages
+ to be garbled; Surfers to Eastern European sites should change it to
+ something closer. And then some page access counters work by looking at the
+ <SPAN
+CLASS="QUOTE"
+>"Referer"</SPAN
+> header; they may fail or break if unavailable. The
+ weather maps of Intellicast have been blocked by their server when no
+ <SPAN
+CLASS="QUOTE"
+>"Referer"</SPAN
+> or cookie is provided, is another example. (But you
+ can forge both headers without giving information away). There are
+ many other ways things can go wrong when trying to fool a web server. The
+ results of which could inadvertently cause pages to load incorrectly,
+ partially, or even not at all. And there may be no obvious clues as to just
+ what went wrong, or why. Nowhere will there be a message that says
+ <SPAN
+CLASS="QUOTE"
+>"<SPAN
+CLASS="emphasis"
+><I
+CLASS="EMPHASIS"
+>Turn off <TT
+CLASS="LITERAL"
+>fast-redirects</TT
+> or else!</I
+></SPAN
+>
+ "</SPAN
+></P
+><P
+> Similar thoughts apply to modifying JavaScript, and, to a lesser degree,
+ HTML elements.</P
+><P
+> If you have problems with a site, you will have to adjust your configuration
+ accordingly. Cookies are probably the most likely adjustment that may
+ be required, but by no means the only one.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="CACHING"
+>4.12. Can Privoxy act as a <SPAN
+CLASS="QUOTE"
+>"caching"</SPAN
+> proxy to
+speed up web browsing?</A
+></H3
+><P
+> No, it does not have this ability at all. You want something like
+ <A
+HREF="http://www.squid-cache.org/"
+TARGET="_top"
+>Squid</A
+> or
+ <A
+HREF="http://www.pps.jussieu.fr/~jch/software/polipo/"
+TARGET="_top"
+>Polipo</A
+> for this.
+ And, yes, before you ask, <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> can co-exist
+ with other kinds of proxies like <SPAN
+CLASS="APPLICATION"
+>Squid</SPAN
+>.
+ See the <A
+HREF="../user-manual/config.html#FORWARDING"
+TARGET="_top"
+>forwarding
+ chapter</A
+> in the <A
+HREF="../user-manual/index.html"
+TARGET="_top"
+>user
+ manual</A
+> for details.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="FIREWALL"
+>4.13. What about as a firewall? Can Privoxy protect me?</A
+></H3
+><P
+> Not in the way you mean, or in the way some firewall vendors claim they can.
+ <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> can help protect your privacy, but can't
+ protect your system from intrusion attempts. It is, of course, perfectly possible
+ to use <SPAN
+CLASS="emphasis"
+><I
+CLASS="EMPHASIS"
+>both</I
+></SPAN
+>.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="WASTED"
+>4.14. I have large empty spaces / a checkerboard pattern now where
+ads used to be. Why?</A
+></H3
+><P
+> It is technically possible to eliminate banners and ads in a way that frees
+ their allocated page space. This could easily be done by blocking with
+ <SPAN
+CLASS="APPLICATION"
+>Privoxy's</SPAN
+> filters,
+ and eliminating the <SPAN
+CLASS="emphasis"
+><I
+CLASS="EMPHASIS"
+>entire</I
+></SPAN
+> image references from the
+ HTML page source.</P
+><P
+> But, this would consume considerably more CPU resources (IOW, slow things
+ down), would likely destroy the layout of some web pages which rely on the
+ banners utilizing a certain amount of page space, and might fail in other
+ cases, where the screen space is reserved (e.g. by HTML tables for instance).
+ Also, making ads and banners disappear without any trace complicates
+ troubleshooting, and would sooner or later be problematic.</P
+><P
+> The better alternative is to instead let them stay, and block the resulting
+ requests for the banners themselves as is now the case. This leaves either
+ empty space, or the familiar checkerboard pattern.</P
+><P
+> So the developers won't support this in the default configuration, but you
+ can of course define appropriate filters yourself to achieve this.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="SSL"
+>4.15. How can Privoxy filter Secure (HTTPS) URLs?</A
+></H3
+><P
+> Since secure HTTP connections are encrypted SSL sessions between your browser
+ and the secure site, and are meant to be reliably <SPAN
+CLASS="emphasis"
+><I
+CLASS="EMPHASIS"
+>secure</I
+></SPAN
+>,
+ there is little that <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> can do but hand the raw
+ gibberish data though from one end to the other unprocessed.</P
+><P
+> The only exception to this is blocking by host patterns, as the client needs
+ to tell <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> the name of the remote server,
+ so that <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> can establish the connection.
+ If that name matches a host-only pattern, the connection will be blocked.</P
+><P
+> As far as ad blocking is concerned, this is less of a restriction than it may
+ seem, since ad sources are often identifiable by the host name, and often
+ the banners to be placed in an encrypted page come unencrypted nonetheless
+ for efficiency reasons, which exposes them to the full power of
+ <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+>'s ad blocking.</P
+><P
+> <SPAN
+CLASS="QUOTE"
+>"Content cookies"</SPAN
+> (those that are embedded in the actual HTML or
+ JS page content, see <TT
+CLASS="LITERAL"
+><A
+HREF="../user-manual/actions-file.html#FILTER-CONTENT-COOKIES"
+TARGET="_top"
+>filter{content-cookies}</A
+></TT
+>),
+ in an SSL transaction will be impossible to block under these conditions.
+ Fortunately, this does not seem to be a very common scenario since most
+ cookies come by traditional means.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="HTTP2"
+>4.16. Does Privoxy support HTTP/2?</A
+></H3
+><P
+> Privoxy currently doesn't parse HTTP/2 but applications
+ can tunnel HTTP/2 through Privoxy if Privoxy is configured
+ to allow CONNECT requests (default) which are also used
+ for HTTPS.</P
+><P
+> Adding HTTP/2 support is on the TODO list but currently
+ nobody is known to work on it.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="SECURE"
+>4.17. Privoxy runs as a <SPAN
+CLASS="QUOTE"
+>"server"</SPAN
+>. How
+secure is it? Do I need to take any special precautions?</A
+></H3
+><P
+> On Unix-like systems, <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> can run as a non-privileged
+ user, which is how we recommend it be run. Also, by default
+ <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> listens to requests from <SPAN
+CLASS="QUOTE"
+>"localhost"</SPAN
+>
+ only.</P
+><P
+> The server aspect of <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> is not itself directly
+ exposed to the Internet in this configuration. If you want to have
+ <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> serve as a LAN proxy, this will have to
+ be opened up to allow for LAN requests. In this case, we'd recommend
+ you specify only the LAN gateway address, e.g. 192.168.1.1, in the main
+ <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> configuration file and check all <A
+HREF="../user-manual/config.html#ACCESS-CONTROL"
+TARGET="_top"
+>access control and security
+ options</A
+>. All LAN hosts can then use this as their proxy address
+ in the browser proxy configuration, but <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+>
+ will not listen on any external interfaces. ACLs can be defined in addition,
+ and using a firewall is always good too. Better safe than sorry.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="TURNOFF"
+>4.18. Can I temporarily disable Privoxy?</A
+></H3
+><P
+> <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> doesn't have a transparent proxy mode,
+ but you can toggle off blocking and content filtering.</P
+><P
+> The easiest way to do that is to point your browser
+ to the remote toggle URL: <A
+HREF="http://config.privoxy.org/toggle"
+TARGET="_top"
+>http://config.privoxy.org/toggle</A
+>.</P
+><P
+> See the <A
+HREF="../user-manual/appendix.html#BOOKMARKLETS"
+TARGET="_top"
+>Bookmarklets section</A
+>
+ of the <I
+CLASS="CITETITLE"
+>User Manual</I
+> for an easy way to access this
+ feature. Note that this is a feature that may need to be enabled in the main
+ <TT
+CLASS="FILENAME"
+>config</TT
+> file.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="REALLYOFF"
+>4.19. When <SPAN
+CLASS="QUOTE"
+>"disabled"</SPAN
+> is Privoxy totally
+out of the picture?</A
+></H3
+><P
+> No, this just means all optional filtering and actions are disabled.
+ <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> is still acting as a proxy, but just
+ doing less of the things that <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> would
+ normally be expected to do. It is still a <SPAN
+CLASS="QUOTE"
+>"middle-man"</SPAN
+> in
+ the interaction between your browser and web sites. See below to bypass
+ the proxy.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="TURNOFF2"
+>4.20. How can I tell Privoxy to totally ignore certain sites?</A
+></H3
+><P
+> Bypassing a proxy, or proxying based on arbitrary criteria, is purely a browser
+ configuration issue, not a <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> issue. Modern browsers typically do have
+ settings for not proxying certain sites. Check your browser's help files.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="CRUNCH"
+>4.21. My logs show Privoxy <SPAN
+CLASS="QUOTE"
+>"crunches"</SPAN
+>
+ads, but also its own internal CGI pages. What is a <SPAN
+CLASS="QUOTE"
+>"crunch"</SPAN
+>?</A
+></H3
+><P
+> A <SPAN
+CLASS="QUOTE"
+>"crunch"</SPAN
+> means <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> intercepted
+ <SPAN
+CLASS="emphasis"
+><I
+CLASS="EMPHASIS"
+>something</I
+></SPAN
+>, nothing more. Often this is indeed ads or
+ banners, but <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> uses the same mechanism for
+ trapping requests for its own internal pages. For instance, a request for
+ <SPAN
+CLASS="APPLICATION"
+>Privoxy's</SPAN
+> configuration page at: <A
+HREF="http://config.privoxy.org"
+TARGET="_top"
+>http://config.privoxy.org</A
+>, is
+ intercepted (i.e. it does not go out to the 'net), and the familiar CGI
+ configuration is returned to the browser, and the log consequently will show
+ a <SPAN
+CLASS="QUOTE"
+>"crunch"</SPAN
+>.</P
+><P
+> Since version 3.0.7, Privoxy will also log the crunch reason.
+ If you are using an older version you might want to upgrade.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="DOWNLOADS"
+>4.22. Can Privoxy affect files that I download
+from a webserver? FTP server?</A
+></H3
+><P
+> From the webserver's perspective, there is no difference between
+ viewing a document (i.e. a page), and downloading a file. The same is true of
+ <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+>. If there is a match for a <TT
+CLASS="LITERAL"
+><A
+HREF="../user-manual/actions-file.html#BLOCK"
+TARGET="_top"
+>block</A
+></TT
+> pattern,
+ it will still be blocked, and of course this is obvious.
+ </P
+><P
+> Filtering is potentially more of a concern since the results are not always
+ so obvious, and the effects of filtering are there whether the file is simply
+ viewed, or downloaded. And potentially whether the content is some obnoxious
+ advertisement, or Mr. Jimmy's latest/greatest source code jewel. Of course,
+ one of these presumably is <SPAN
+CLASS="QUOTE"
+>"bad"</SPAN
+> content that we don't want, and
+ the other is <SPAN
+CLASS="QUOTE"
+>"good"</SPAN
+> content that we do want.
+ <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> is blind to the differences, and can only
+ distinguish <SPAN
+CLASS="QUOTE"
+>"good from bad"</SPAN
+> by the configuration parameters
+ <SPAN
+CLASS="emphasis"
+><I
+CLASS="EMPHASIS"
+>we</I
+></SPAN
+> give it.</P
+><P
+> <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> knows the differences in files according
+ to the <SPAN
+CLASS="QUOTE"
+>"Content Type"</SPAN
+> as reported by the webserver. If this is
+ reported accurately (e.g. <SPAN
+CLASS="QUOTE"
+>"application/zip"</SPAN
+> for a zip archive),
+ then <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> knows to ignore these where
+ appropriate. <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> potentially can filter HTML
+ as well as plain text documents, subject to configuration parameters of
+ course. Also, documents that are of an unknown type (generally assumed to be
+ <SPAN
+CLASS="QUOTE"
+>"text/plain"</SPAN
+>) can be filtered, as will those that might be
+ incorrectly reported by the webserver. If such a file is a downloaded file
+ that is intended to be saved to disk, then any content that might have been
+ altered by filtering, will be saved too, for these (probably rare) cases.</P
+><P
+> Note that versions later than 3.0.2 do NOT filter document types reported as
+ <SPAN
+CLASS="QUOTE"
+>"text/plain"</SPAN
+>. Prior to this, <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+>
+ did filter this document type.</P
+><P
+> In short, filtering is <SPAN
+CLASS="QUOTE"
+>"ON"</SPAN
+> if a) the content type as reported
+ by the webserver is appropriate <SPAN
+CLASS="emphasis"
+><I
+CLASS="EMPHASIS"
+>and</I
+></SPAN
+> b) the configuration
+ allows it (or at least does not disallow it). That's it. There is no magic
+ cookie anywhere to say this is <SPAN
+CLASS="QUOTE"
+>"good"</SPAN
+> and this is
+ <SPAN
+CLASS="QUOTE"
+>"bad"</SPAN
+>. It's the configuration that lets it all happen or not.</P
+><P
+> If you download text files, you probably do not want these to be filtered,
+ particularly if the content is source code, or other critical content. Source
+ code sometimes might be mistaken for Javascript (i.e. the kind that might
+ open a pop-up window). It is recommended to turn off filtering for download
+ sites (particularly if the content may be plain text files and you are using
+ version 3.0.2 or earlier) in your <TT
+CLASS="FILENAME"
+>user.action</TT
+> file. And
+ also, for any site or page where making <SPAN
+CLASS="emphasis"
+><I
+CLASS="EMPHASIS"
+>any</I
+></SPAN
+> changes at
+ all to the content is to be avoided.</P
+><P
+> <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> does not do FTP at all, only HTTP
+ and HTTPS (SSL) protocols.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="DOWNLOADS2"
+>4.23. I just downloaded a Perl script, and Privoxy
+altered it! Yikes, what is wrong!</A
+></H3
+><P
+> Please read above.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="HOSTSFILE"
+>4.24. Should I continue to use a <SPAN
+CLASS="QUOTE"
+>"HOSTS"</SPAN
+> file for ad-blocking?</A
+></H3
+><P
+> One time-tested technique to defeat common ads is to trick the local DNS
+ system by giving a phony IP address for the ad generator in the local
+ <TT
+CLASS="FILENAME"
+>HOSTS</TT
+> file, typically using <TT
+CLASS="LITERAL"
+>127.0.0.1</TT
+>, aka
+ <TT
+CLASS="LITERAL"
+>localhost</TT
+>. This effectively blocks the ad.</P
+><P
+> There is no reason to use this technique in conjunction with
+ <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+>. <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+>
+ does essentially the same thing, much more elegantly and with much more
+ flexibility. A large <TT
+CLASS="FILENAME"
+>HOSTS</TT
+> file, in fact, not only
+ duplicates effort, but may get in the way and seriously slow down your system.
+ It is recommended to remove such entries from your <TT
+CLASS="FILENAME"
+>HOSTS</TT
+> file. If you think
+ your hosts list is neglected by <SPAN
+CLASS="APPLICATION"
+>Privoxy's </SPAN
+>
+ configuration, consider adding your list to your <TT
+CLASS="FILENAME"
+>user.action</TT
+> file:</P
+><TABLE
+BORDER="0"
+BGCOLOR="#E0E0E0"
+WIDTH="100%"
+><TR
+><TD
+><PRE
+CLASS="SCREEN"
+> { +block }
www.ad.example1.com
ad.example2.com
ads.galore.example.com
- etc.example.com
-</pre>
- </td>
- </tr>
- </table>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="SEEALSO" id="SEEALSO">4.24. Where can I find
- more information about Privoxy and related issues?</a></h3>
-
- <p>Other references and sites of interest to <span class=
- "APPLICATION">Privoxy</span> users:</p>
-
- <table border="0">
- <tbody>
- <tr>
- <td><a href="http://www.privoxy.org/" target=
- "_top">http://www.privoxy.org/</a>, the <span class=
- "APPLICATION">Privoxy</span> Home page.</td>
- </tr>
- </tbody>
- </table>
-
- <table border="0">
- <tbody>
- <tr>
- <td><a href="http://www.privoxy.org/faq/" target=
- "_top">http://www.privoxy.org/faq/</a>, the <span class=
- "APPLICATION">Privoxy</span> FAQ.</td>
- </tr>
- </tbody>
- </table>
-
- <table border="0">
- <tbody>
- <tr>
- <td><a href="http://www.privoxy.org/developer-manual/" target=
- "_top">http://www.privoxy.org/developer-manual/</a>, the
- <span class="APPLICATION">Privoxy</span> developer manual.</td>
- </tr>
- </tbody>
- </table>
-
- <table border="0">
- <tbody>
- <tr>
- <td><a href="https://sourceforge.net/projects/ijbswa/" target=
- "_top">https://sourceforge.net/projects/ijbswa/</a>, the Project
- Page for <span class="APPLICATION">Privoxy</span> on <a href=
- "http://sourceforge.net" target="_top">SourceForge</a>.</td>
- </tr>
- </tbody>
- </table>
-
- <table border="0">
- <tbody>
- <tr>
- <td><a href="http://config.privoxy.org/" target=
- "_top">http://config.privoxy.org/</a>, the web-based user
- interface. <span class="APPLICATION">Privoxy</span> must be
- running for this to work. Shortcut: <a href="http://p.p/" target=
- "_top">http://p.p/</a></td>
- </tr>
- </tbody>
- </table>
-
- <table border="0">
- <tbody>
- <tr>
- <td><a href=
- "https://sourceforge.net/tracker/?group_id=11118&atid=460288"
- target=
- "_top">https://sourceforge.net/tracker/?group_id=11118&atid=460288</a>,
- to submit <span class="QUOTE">"misses"</span> and other
- configuration related suggestions to the developers.</td>
- </tr>
- </tbody>
- </table>
-
- <table border="0">
- <tbody>
- <tr>
- <td><a href="http://www.squid-cache.org/" target=
- "_top">http://www.squid-cache.org/</a>, a popular caching proxy,
- which is often used together with <span class=
- "APPLICATION">Privoxy</span>.</td>
- </tr>
- </tbody>
- </table>
-
- <table border="0">
- <tbody>
- <tr>
- <td><a href=
- "http://www.pps.univ-paris-diderot.fr/~jch/software/polipo/"
- target=
- "_top">http://www.pps.univ-paris-diderot.fr/~jch/software/polipo/</a>,
- <span class="APPLICATION">Polipo</span> is a caching proxy with
- advanced features like pipelining, multiplexing and caching of
- partial instances. In many setups it can be used as <span class=
- "APPLICATION">Squid</span> replacement.</td>
- </tr>
- </tbody>
- </table>
-
- <table border="0">
- <tbody>
- <tr>
- <td><a href="https://www.torproject.org/" target=
- "_top">https://www.torproject.org/</a>, <span class=
- "APPLICATION">Tor</span> can help anonymize web browsing, web
- publishing, instant messaging, IRC, SSH, and other
- applications.</td>
- </tr>
- </tbody>
- </table>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="MICROSUCK" id="MICROSUCK">4.25. I've noticed
- that Privoxy changes <span class="QUOTE">"Microsoft"</span> to
- <span class="QUOTE">"MicroSuck"</span>! Why are you manipulating my
- browsing?</a></h3>
-
- <p>We're not. The text substitutions that you are seeing are disabled
- in the default configuration as shipped. You have either manually
- activated the <span class="QUOTE">"<tt class="LITERAL">fun</tt>"</span>
- filter which is clearly labeled <span class="QUOTE">"Text replacements
- for subversive browsing fun!"</span> or you are using an older Privoxy
- version and have implicitly activated it by choosing the <span class=
- "QUOTE">"Advanced"</span> profile in the web-based editor. Please
- upgrade.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="VALID" id="VALID">4.26. Does Privoxy produce
- <span class="QUOTE">"valid"</span> HTML (or XHTML)?</a></h3>
-
- <p>Privoxy generates HTML in both its own <span class=
- "QUOTE">"templates"</span>, and possibly whenever there are text
- substitutions via a <span class="APPLICATION">Privoxy</span> filter.
- While this should always conform to the HTML 4.01 specifications, it
- has not been validated against this or any other standard.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="SURPRISE-PRIVOXY" id=
- "SURPRISE-PRIVOXY">4.27. How did you manage to get Privoxy on my
- computer without my consent?</a></h3>
-
- <p>We didn't. We make Privoxy available for download, but we don't go
- around installing it on other people's systems behind their back. If
- you discover Privoxy running on your system and are sure you didn't
- install it yourself, somebody else did. You may not even be running the
- real Privoxy, but maybe something else that only pretends to be
- Privoxy, or maybe something that is based on the real Privoxy, but has
- been modified.</p>
-
- <p>Lately there have been reports of problems with some kind of Privoxy
- versions that come preinstalled on some Netbooks. Some of the problems
- described are inconsistent with the behaviour of official Privoxy
- versions, which suggests that the preinstalled software may contain
- vendor modifications that we don't know about and thus can't debug.</p>
-
- <p>Privoxy's <a href="copyright.html">license</a> allows vendor
- modifications, but the vendor has to comply with the license, which
- involves informing the user about the changes and to make the changes
- available under the same license as Privoxy itself.</p>
-
- <p>If you are having trouble with a modified Privoxy version, please
- try to talk to whoever made the modifications before reporting the
- problem to us. Please also try to convince whoever made the
- modifications to talk to us. If you think somebody gave you a modified
- Privoxy version without complying to the license, please let us
- know.</p>
- </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=
- "configuration.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="trouble.html"
- accesskey="N">Next</a></td>
- </tr>
-
- <tr>
- <td width="33%" align="left" valign="top">Configuration</td>
-
- <td width="34%" align="center" valign="top"> </td>
-
- <td width="33%" align="right" valign="top">Troubleshooting</td>
- </tr>
- </table>
- </div>
-</body>
-</html>
+ etc.example.com</PRE
+></TD
+></TR
+></TABLE
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="SEEALSO"
+>4.25. Where can I find more information about Privoxy
+and related issues?</A
+></H3
+><P
+> Other references and sites of interest to <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+>
+ users:</P
+><P
+></P
+><TABLE
+BORDER="0"
+><TBODY
+><TR
+><TD
+> <A
+HREF="https://www.privoxy.org/"
+TARGET="_top"
+>https://www.privoxy.org/</A
+>,
+ the <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> Home page.
+ </TD
+></TR
+></TBODY
+></TABLE
+><P
+></P
+><P
+></P
+><TABLE
+BORDER="0"
+><TBODY
+><TR
+><TD
+> <A
+HREF="https://www.privoxy.org/faq/"
+TARGET="_top"
+>https://www.privoxy.org/faq/</A
+>,
+ the <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> FAQ.
+ </TD
+></TR
+></TBODY
+></TABLE
+><P
+></P
+><P
+></P
+><TABLE
+BORDER="0"
+><TBODY
+><TR
+><TD
+> <A
+HREF="https://www.privoxy.org/developer-manual/"
+TARGET="_top"
+>https://www.privoxy.org/developer-manual/</A
+>,
+ the <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> developer manual.
+ </TD
+></TR
+></TBODY
+></TABLE
+><P
+></P
+><P
+></P
+><TABLE
+BORDER="0"
+><TBODY
+><TR
+><TD
+> <A
+HREF="https://sourceforge.net/projects/ijbswa/"
+TARGET="_top"
+>https://sourceforge.net/projects/ijbswa/</A
+>,
+ the Project Page for <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> on
+ <A
+HREF="http://sourceforge.net"
+TARGET="_top"
+>SourceForge</A
+>.
+ </TD
+></TR
+></TBODY
+></TABLE
+><P
+></P
+><P
+></P
+><TABLE
+BORDER="0"
+><TBODY
+><TR
+><TD
+> <A
+HREF="http://config.privoxy.org/"
+TARGET="_top"
+>http://config.privoxy.org/</A
+>,
+ the web-based user interface. <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> must be
+ running for this to work. Shortcut: <A
+HREF="http://p.p/"
+TARGET="_top"
+>http://p.p/</A
+>
+ </TD
+></TR
+></TBODY
+></TABLE
+><P
+></P
+><P
+></P
+><TABLE
+BORDER="0"
+><TBODY
+><TR
+><TD
+> <A
+HREF="https://sourceforge.net/tracker/?group_id=11118&atid=460288"
+TARGET="_top"
+>https://sourceforge.net/tracker/?group_id=11118&atid=460288</A
+>, to submit <SPAN
+CLASS="QUOTE"
+>"misses"</SPAN
+> and other
+ configuration related suggestions to the developers.
+ </TD
+></TR
+></TBODY
+></TABLE
+><P
+></P
+><P
+></P
+><TABLE
+BORDER="0"
+><TBODY
+><TR
+><TD
+> <A
+HREF="http://www.squid-cache.org/"
+TARGET="_top"
+>http://www.squid-cache.org/</A
+>, a popular
+ caching proxy, which is often used together with <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+>.
+ </TD
+></TR
+></TBODY
+></TABLE
+><P
+></P
+><P
+></P
+><TABLE
+BORDER="0"
+><TBODY
+><TR
+><TD
+> <A
+HREF="http://www.pps.univ-paris-diderot.fr/~jch/software/polipo/"
+TARGET="_top"
+>http://www.pps.univ-paris-diderot.fr/~jch/software/polipo/</A
+>,
+ <SPAN
+CLASS="APPLICATION"
+>Polipo</SPAN
+> is a caching proxy with advanced features
+ like pipelining, multiplexing and caching of partial instances. In many setups
+ it can be used as <SPAN
+CLASS="APPLICATION"
+>Squid</SPAN
+> replacement.
+ </TD
+></TR
+></TBODY
+></TABLE
+><P
+></P
+><P
+></P
+><TABLE
+BORDER="0"
+><TBODY
+><TR
+><TD
+> <A
+HREF="https://www.torproject.org/"
+TARGET="_top"
+>https://www.torproject.org/</A
+>,
+ <SPAN
+CLASS="APPLICATION"
+>Tor</SPAN
+> can help anonymize web browsing,
+ web publishing, instant messaging, IRC, SSH, and other applications.
+ </TD
+></TR
+></TBODY
+></TABLE
+><P
+></P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="MICROSUCK"
+>4.26. I've noticed that Privoxy changes <SPAN
+CLASS="QUOTE"
+>"Microsoft"</SPAN
+> to
+<SPAN
+CLASS="QUOTE"
+>"MicroSuck"</SPAN
+>! Why are you manipulating my browsing?</A
+></H3
+><P
+> We're not. The text substitutions that you are seeing are disabled
+ in the default configuration as shipped. You have either manually
+ activated the <SPAN
+CLASS="QUOTE"
+>"<TT
+CLASS="LITERAL"
+>fun</TT
+>"</SPAN
+> filter which
+ is clearly labeled <SPAN
+CLASS="QUOTE"
+>"Text replacements for subversive browsing
+ fun!"</SPAN
+> or you are using an older Privoxy version and have implicitly
+ activated it by choosing the <SPAN
+CLASS="QUOTE"
+>"Advanced"</SPAN
+> profile in the
+ web-based editor. Please upgrade.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="VALID"
+>4.27. Does Privoxy produce <SPAN
+CLASS="QUOTE"
+>"valid"</SPAN
+> HTML (or XHTML)?</A
+></H3
+><P
+> Privoxy generates HTML in both its own <SPAN
+CLASS="QUOTE"
+>"templates"</SPAN
+>, and possibly
+ whenever there are text substitutions via a <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> filter. While this
+ should always conform to the HTML 4.01 specifications, it has not been
+ validated against this or any other standard.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="SURPRISE-PRIVOXY"
+>4.28. How did you manage to get Privoxy on my computer without my consent?</A
+></H3
+><P
+> We didn't. We make Privoxy available for download, but we don't go
+ around installing it on other people's systems behind their back.
+ If you discover Privoxy running on your system and are sure you didn't
+ install it yourself, somebody else did. You may not even be running
+ the real Privoxy, but maybe something else that only pretends to be
+ Privoxy, or maybe something that is based on the real Privoxy,
+ but has been modified.</P
+><P
+> Lately there have been reports of problems with some kind of
+ "parental control" software based on Privoxy that came preinstalled on
+ certain <A
+HREF="https://sourceforge.net/p/ijbswa/bugs/813/"
+TARGET="_top"
+>ASUS Netbooks</A
+>.
+ The problems described are inconsistent with the behaviour of official
+ Privoxy versions, which suggests that the preinstalled software may
+ contain vendor modifications that we don't know about and thus can't debug.</P
+><P
+> Privoxy's <A
+HREF="copyright.html"
+>license</A
+> allows vendor
+ modifications, but the vendor has to comply with the license,
+ which involves informing the user about the changes and to make
+ the changes available under the same license as Privoxy itself.</P
+><P
+> If you are having trouble with a modified Privoxy version,
+ please try to talk to whoever made the modifications before
+ reporting the problem to us. Please also try to convince
+ whoever made the modifications to talk to us. If you think
+ somebody gave you a modified Privoxy version without complying
+ to the license, please let us know.</P
+></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="configuration.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="trouble.html"
+ACCESSKEY="N"
+>Next</A
+></TD
+></TR
+><TR
+><TD
+WIDTH="33%"
+ALIGN="left"
+VALIGN="top"
+>Configuration</TD
+><TD
+WIDTH="34%"
+ALIGN="center"
+VALIGN="top"
+> </TD
+><TD
+WIDTH="33%"
+ALIGN="right"
+VALIGN="top"
+>Troubleshooting</TD
+></TR
+></TABLE
+></DIV
+></BODY
+></HTML
+>
\ No newline at end of file
projects / privoxy.git / blobdiff