1745 lines
37 KiB
HTML
1745 lines
37 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">
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<HTML
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><HEAD
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><TITLE
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>Miscellaneous</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK
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REL="HOME"
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TITLE="Privoxy Frequently Asked Questions"
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HREF="index.html"><LINK
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REL="PREVIOUS"
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TITLE="Configuration"
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HREF="configuration.html"><LINK
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REL="NEXT"
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TITLE="Troubleshooting"
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HREF="trouble.html"><LINK
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REL="STYLESHEET"
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TYPE="text/css"
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HREF="../p_doc.css"><META
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HTTP-EQUIV="Content-Type"
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CONTENT="text/html;
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charset=ISO-8859-1"></HEAD
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><BODY
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CLASS="SECT1"
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BGCOLOR="#EEEEEE"
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TEXT="#000000"
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LINK="#0000FF"
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VLINK="#840084"
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ALINK="#0000FF"
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><DIV
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CLASS="NAVHEADER"
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><TABLE
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SUMMARY="Header navigation table"
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>Privoxy Frequently Asked Questions</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="configuration.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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></TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="trouble.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="SECT1"
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><H1
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CLASS="SECT1"
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><A
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NAME="MISC"
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>4. Miscellaneous</A
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></H1
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><DIV
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CLASS="SECT2"
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><H3
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CLASS="SECT2"
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><A
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NAME="AEN729"
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>4.1. How much does Privoxy slow my browsing down? This
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has to add extra time to browsing.</A
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></H3
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><P
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> How much of an impact depends on many things, including the CPU of the host
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system, how aggressive the configuration is, which specific actions are being triggered,
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the size of the page, the bandwidth of the connection, etc.</P
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><P
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> Overall, it should not slow you down any in real terms, and may actually help
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speed things up since ads, banners and other junk are not typically being
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retrieved and displayed. The actual processing time required by
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<SPAN
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CLASS="APPLICATION"
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>Privoxy</SPAN
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> itself for each page, is relatively small
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in the overall scheme of things, and happens very quickly. This is typically
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more than offset by time saved not downloading and rendering ad images and
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other junk content (if ad blocking is being used).</P
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><P
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> <SPAN
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CLASS="QUOTE"
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>"Filtering"</SPAN
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> content via the <TT
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CLASS="LITERAL"
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><A
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HREF="../user-manual/actions-file.html#FILTER"
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TARGET="_top"
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>filter</A
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></TT
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> or
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<TT
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CLASS="LITERAL"
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><A
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HREF="../user-manual/actions-file.html#DEANIMATE-GIFS"
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TARGET="_top"
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>deanimate-gifs</A
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></TT
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>
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actions may cause a perceived slowdown, since the entire document
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needs to be buffered before displaying. And on very large documents,
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filtering may have some measurable impact. How much depends on the page size,
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the actual definition of the filter(s), etc. See below. Most other actions
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have little to no impact on speed.</P
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><P
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> Also, when filtering is enabled but zlib support isn't available, compression
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is often disabled (see <A
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HREF="../user-manual/actions-file.html#PREVENT-COMPRESSION"
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TARGET="_top"
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>prevent-compression</A
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>).
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This can have an impact on speed as well, although it's probably smaller than
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you might think. Again, the page size, etc. will determine how much of an impact.</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H3
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CLASS="SECT2"
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><A
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NAME="LOADINGTIMES"
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>4.2. I notice considerable
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delays in page requests. What's wrong?</A
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></H3
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><P
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> If you use any <TT
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CLASS="LITERAL"
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><A
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HREF="../user-manual/actions-file.html#FILTER"
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TARGET="_top"
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>filter</A
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></TT
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> action,
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such as filtering banners by size, web-bugs etc, or the <TT
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CLASS="LITERAL"
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><A
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HREF="../user-manual/actions-file.html#DEANIMATE-GIFS"
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TARGET="_top"
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>deanimate-gifs</A
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></TT
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>
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action, the entire document must be loaded into memory in order for the filtering
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mechanism to work, and nothing is sent to the browser during this time.</P
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><P
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> The loading time typically does not really change much in real numbers, but
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the feeling is different, because most browsers are able to start rendering
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incomplete content, giving the user a feeling of "it works". This effect is
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more noticeable on slower dialup connections. Extremely large documents
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may have some impact on the time to load the page where there is filtering
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being done. But overall, the difference should be very minimal. If there is a
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big impact, then probably some other situation is contributing (like
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anti-virus software).
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</P
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><P
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> Filtering is automatically disabled for inappropriate MIME types. But note
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that if the web server mis-reports the MIME type, then content that should
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not be filtered, could be. <SPAN
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CLASS="APPLICATION"
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>Privoxy</SPAN
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> only knows how
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to differentiate filterable content because of the MIME type as reported by
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the server, or because of some configuration setting that enables/disables
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filtering.</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H3
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CLASS="SECT2"
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><A
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NAME="CONFIGURL"
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>4.3. What are "http://config.privoxy.org/" and
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"http://p.p/"?</A
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></H3
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><P
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> <A
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HREF="http://config.privoxy.org/"
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TARGET="_top"
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>http://config.privoxy.org/</A
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> is the
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address of <SPAN
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CLASS="APPLICATION"
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>Privoxy</SPAN
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>'s built-in user interface, and
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<A
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HREF="http://p.p/"
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TARGET="_top"
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>http://p.p/</A
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> is a shortcut for it.</P
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><P
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> Since <SPAN
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CLASS="APPLICATION"
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>Privoxy</SPAN
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> sits between your web browser and the Internet,
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it can simply intercept requests for these addresses and answer them with its built-in
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<SPAN
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CLASS="QUOTE"
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>"web server"</SPAN
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>.</P
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><P
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> This also makes for a good test for your browser configuration: If entering the
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URL <A
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HREF="http://config.privoxy.org/"
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TARGET="_top"
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>http://config.privoxy.org/</A
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>
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takes you to a page saying <SPAN
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CLASS="QUOTE"
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>"This is Privoxy ..."</SPAN
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>, everything is OK.
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If you get a page saying <SPAN
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CLASS="QUOTE"
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>"Privoxy is not working"</SPAN
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> instead, then
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your browser didn't use <SPAN
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CLASS="APPLICATION"
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>Privoxy</SPAN
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> for the request,
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hence it could not be intercepted, and you have accessed the <SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>real</I
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></SPAN
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>
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web site at config.privoxy.org.</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H3
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CLASS="SECT2"
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><A
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NAME="NEWADS"
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>4.4. How can I submit new ads, or report
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problems?</A
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></H3
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><P
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>Please see the <A
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HREF="contact.html"
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>Contact section</A
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> for
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various ways to interact with the developers.</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H3
|
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CLASS="SECT2"
|
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><A
|
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NAME="NEWADS2"
|
|
>4.5. If I do submit missed ads, will
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they be included in future updates?</A
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></H3
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><P
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> Whether such submissions are eventually included in the
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<TT
|
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CLASS="FILENAME"
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>default.action</TT
|
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> configuration file depends on how
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significant the issue is. We of course want to address any potential
|
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problem with major, high-profile sites such as <I
|
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CLASS="CITETITLE"
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>Google</I
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>,
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<I
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CLASS="CITETITLE"
|
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>Yahoo</I
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>, etc. Any site with global or regional reach,
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has a good chance of being a candidate. But at the other end of the spectrum
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are any number of smaller, low-profile sites such as for local clubs or
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schools. Since their reach and impact are much less, they are best handled by
|
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inclusion in the user's <TT
|
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CLASS="FILENAME"
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>user.action</TT
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>, and thus would be
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unlikely to be included. </P
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></DIV
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><DIV
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CLASS="SECT2"
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><H3
|
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CLASS="SECT2"
|
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><A
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NAME="NOONECARES"
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>4.6. Why doesn't anyone answer my support
|
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request?</A
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></H3
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><P
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>Rest assured that it has been read and considered. Why it is not answered,
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could be for various reasons, including no one has a good answer for it, no
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one has had time to yet investigate it thoroughly, it has been reported
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numerous times already, or because not enough information was provided to help
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us help you. Your efforts are not wasted, and we do appreciate them.</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H3
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CLASS="SECT2"
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><A
|
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NAME="IP"
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>4.7. How can I hide my IP address?</A
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></H3
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><P
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> If you run both the browser and <SPAN
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CLASS="APPLICATION"
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>Privoxy</SPAN
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> locally, you cannot hide your IP
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address with <SPAN
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CLASS="APPLICATION"
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>Privoxy</SPAN
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> or ultimately any other
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software alone. The server needs to know your IP address so that it knows
|
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where to send the responses back. </P
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><P
|
|
> There are many publicly usable "anonymous" proxies out there, which
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provide a further level of indirection between you and the web server.</P
|
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><P
|
|
> However, these proxies are called "anonymous" because you don't need
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to authenticate, not because they would offer any real anonymity.
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Most of them will log your IP address and make it available to the
|
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authorities in case you violate the law of the country they run in. In fact
|
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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
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><P
|
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> If you want to hide your IP address from most adversaries,
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you should consider chaining <SPAN
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CLASS="APPLICATION"
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>Privoxy</SPAN
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>
|
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with <A
|
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HREF="https://www.torproject.org/"
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|
TARGET="_top"
|
|
>Tor</A
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>.
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The configuration details can be found in
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<A
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HREF="#TOR"
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TARGET="_top"
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>How do I use <SPAN
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CLASS="APPLICATION"
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|
>Privoxy</SPAN
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> together
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with <SPAN
|
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CLASS="APPLICATION"
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>Tor</SPAN
|
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> section</A
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>
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just below.</P
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></DIV
|
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><DIV
|
|
CLASS="SECT2"
|
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><H3
|
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CLASS="SECT2"
|
|
><A
|
|
NAME="AEN794"
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>4.8. Can Privoxy guarantee I am anonymous?</A
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></H3
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><P
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> No. Your chances of remaining anonymous are improved, but unless you
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<A
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HREF="#TOR"
|
|
TARGET="_top"
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>chain <SPAN
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CLASS="APPLICATION"
|
|
>Privoxy</SPAN
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> with <SPAN
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CLASS="APPLICATION"
|
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>Tor</SPAN
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></A
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>
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or a similar proxy and know what you're doing when it comes to configuring
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the rest of your system, you should assume that everything you do
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on the Web can be traced back to you.</P
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><P
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> <SPAN
|
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CLASS="APPLICATION"
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>Privoxy</SPAN
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> can remove various information about you,
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and allows <SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
|
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>you</I
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></SPAN
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> more freedom to decide which sites
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you can trust, and what details you want to reveal. But it neither
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hides your IP address, nor can it guarantee that the rest of the system
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behaves correctly. There are several possibilities how a web sites can find
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out who you are, even if you are using a strict <SPAN
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CLASS="APPLICATION"
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>Privoxy</SPAN
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>
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configuration and chained it with <SPAN
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CLASS="APPLICATION"
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>Tor</SPAN
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>.</P
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><P
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> Most of <SPAN
|
|
CLASS="APPLICATION"
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|
>Privoxy's</SPAN
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> privacy-enhancing features can be easily subverted
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by an insecure browser configuration, therefore you should use a browser that can
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be configured to only execute code from trusted sites, and be careful which sites you trust.
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For example there is no point in having <SPAN
|
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CLASS="APPLICATION"
|
|
>Privoxy</SPAN
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>
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modify the User-Agent header, if websites can get all the information they want
|
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through JavaScript, ActiveX, Flash, Java etc.</P
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><P
|
|
> A few browsers disclose the user's email address in certain situations, such
|
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as when transferring a file by FTP. <SPAN
|
|
CLASS="APPLICATION"
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|
>Privoxy</SPAN
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>
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does not filter FTP. If you need this feature, or are concerned about the
|
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mail handler of your browser disclosing your email address, you might
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consider products such as <SPAN
|
|
CLASS="APPLICATION"
|
|
>NSClean</SPAN
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|
>.</P
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><P
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|
> Browsers available only as binaries could use non-standard headers to give
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out any information they can have access to: see the manufacturer's license
|
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agreement. It's impossible to anticipate and prevent every breach of privacy
|
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that might occur. The professionally paranoid prefer browsers available as
|
|
source code, because anticipating their behavior is easier. Trust the source,
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|
Luke!</P
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></DIV
|
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><DIV
|
|
CLASS="SECT2"
|
|
><H3
|
|
CLASS="SECT2"
|
|
><A
|
|
NAME="AEN812"
|
|
>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
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|
<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
|
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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
|
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<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
|
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><P
|
|
> If you verified that <SPAN
|
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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 or socks4a. Most likely you are interested in <SPAN
|
|
CLASS="APPLICATION"
|
|
>Tor</SPAN
|
|
>
|
|
to increase your anonymity level, therefore you should use socks4a, to make sure DNS requests are
|
|
done through <SPAN
|
|
CLASS="APPLICATION"
|
|
>Tor</SPAN
|
|
> and thus invisible to your local network.</P
|
|
><P
|
|
> Since <SPAN
|
|
CLASS="APPLICATION"
|
|
>Privoxy</SPAN
|
|
> 3.0.5, its
|
|
<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
|
|
><P
|
|
> <TABLE
|
|
BORDER="0"
|
|
BGCOLOR="#E0E0E0"
|
|
WIDTH="100%"
|
|
><TR
|
|
><TD
|
|
><PRE
|
|
CLASS="SCREEN"
|
|
># forward-socks4a / 127.0.0.1:9050 .
|
|
</PRE
|
|
></TD
|
|
></TR
|
|
></TABLE
|
|
></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
|
|
><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
|
|
><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
|
|
><P
|
|
> <TABLE
|
|
BORDER="0"
|
|
BGCOLOR="#E0E0E0"
|
|
WIDTH="100%"
|
|
><TR
|
|
><TD
|
|
><PRE
|
|
CLASS="SCREEN"
|
|
># forward localhost/ .
|
|
</PRE
|
|
></TD
|
|
></TR
|
|
></TABLE
|
|
></P
|
|
><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="AEN868"
|
|
>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="AEN882"
|
|
>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="AEN892"
|
|
>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="AEN897"
|
|
>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="AEN905"
|
|
>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="AEN919"
|
|
>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"
|
|
>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"
|
|
>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"
|
|
>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"
|
|
>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"
|
|
>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"
|
|
>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"
|
|
>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
|
|
><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
|
|
></P
|
|
></DIV
|
|
><DIV
|
|
CLASS="SECT2"
|
|
><H3
|
|
CLASS="SECT2"
|
|
><A
|
|
NAME="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
|
|
><P
|
|
> <P
|
|
></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
|
|
><P
|
|
></P
|
|
>
|
|
<P
|
|
></P
|
|
><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
|
|
><P
|
|
></P
|
|
>
|
|
<P
|
|
></P
|
|
><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
|
|
><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.junkbusters.com/ht/en/cookies.html"
|
|
TARGET="_top"
|
|
>http://www.junkbusters.com/ht/en/cookies.html</A
|
|
>,
|
|
an explanation how cookies are used to track web users.
|
|
</TD
|
|
></TR
|
|
></TBODY
|
|
></TABLE
|
|
><P
|
|
></P
|
|
>
|
|
<P
|
|
></P
|
|
><TABLE
|
|
BORDER="0"
|
|
><TBODY
|
|
><TR
|
|
><TD
|
|
> <A
|
|
HREF="http://www.junkbusters.com/ijb.html"
|
|
TARGET="_top"
|
|
>http://www.junkbusters.com/ijb.html</A
|
|
>,
|
|
the original Internet Junkbuster.
|
|
</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.jussieu.fr/~jch/software/polipo/"
|
|
TARGET="_top"
|
|
>http://www.pps.jussieu.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
|
|
>
|
|
</P
|
|
></DIV
|
|
><DIV
|
|
CLASS="SECT2"
|
|
><H3
|
|
CLASS="SECT2"
|
|
><A
|
|
NAME="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"
|
|
>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
|
|
><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
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