+<!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 1.76b+
-"><LINK
+CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK
REL="HOME"
TITLE="Privoxy Frequently Asked Questions"
HREF="index.html"><LINK
CLASS="SECT1"
><A
NAME="MISC"
-></A
->4. Miscellaneous</H1
+>4. Miscellaneous</A
+></H1
><DIV
CLASS="SECT2"
><H3
CLASS="SECT2"
><A
-NAME="AEN712"
-></A
+NAME="AEN707"
>4.1. How much does Privoxy slow my browsing down? This
-has to add extra time to browsing.</H3
+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,
>deanimate-gifs</A
></TT
>
- actions will certainly cause a perceived slowdown, since the entire document
+ 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, typically there is a disabling of
- compression, (see <A
+> 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
CLASS="SECT2"
><A
NAME="LOADINGTIMES"
-></A
>4.2. I notice considerable
-delays in page requests compared to the old Junkbuster. What's wrong?</H3
+delays in page requests. What's wrong?</A
+></H3
><P
> If you use any <TT
CLASS="LITERAL"
> 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
+ filtering.</P
></DIV
><DIV
CLASS="SECT2"
CLASS="SECT2"
><A
NAME="CONFIGURL"
-></A
>4.3. What are "http://config.privoxy.org/" and
-"http://p.p/"?</H3
+"http://p.p/"?</A
+></H3
><P
> <A
HREF="http://config.privoxy.org/"
></SPAN
>
web site at config.privoxy.org.</P
-><P
-> With recent versions of <SPAN
-CLASS="APPLICATION"
->Privoxy</SPAN
-> (version 2.9.x and
- later), the user interface features information on the run time status, the
- configuration, and even a built-in editor for the <A
-HREF="../user-manual/actions-file.html"
-TARGET="_top"
->actions files</A
->.</P
-><P
-> Note that the built-in URLs from earlier versions of <SPAN
-CLASS="APPLICATION"
->Junkbuster</SPAN
->
- / <SPAN
-CLASS="APPLICATION"
->Privoxy</SPAN
->, http://example.com/show-proxy-args and http://i.j.b/,
- are no longer supported. If you still use such an old version, you should really consider
- upgrading to 3.0.6.</P
></DIV
><DIV
CLASS="SECT2"
CLASS="SECT2"
><A
NAME="NEWADS"
-></A
>4.4. How can I submit new ads, or report
-problems?</H3
+problems?</A
+></H3
><P
>Please see the <A
HREF="contact.html"
CLASS="SECT2"
><A
NAME="NEWADS2"
-></A
>4.5. If I do submit missed ads, will
-they be included in future updates?</H3
+they be included in future updates?</A
+></H3
><P
> Whether such submissions are eventually included in the
<TT
CLASS="SECT2"
><A
NAME="NOONECARES"
-></A
>4.6. Why doesn't anyone answer my support
-request?</H3
+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
CLASS="SECT2"
><A
NAME="IP"
-></A
->4.7. How can I hide my IP address?</H3
+>4.7. How can I hide my IP address?</A
+></H3
><P
> If you run both the browser and <SPAN
CLASS="APPLICATION"
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
- a password, not because they would offer any real anonymity.
+ 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
>How do I use <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
-> together with <SPAN
+> together
+ with <SPAN
CLASS="APPLICATION"
>Tor</SPAN
> section</A
><H3
CLASS="SECT2"
><A
-NAME="AEN784"
-></A
->4.8. Can Privoxy guarantee I am anonymous?</H3
+NAME="AEN773"
+>4.8. Can Privoxy guarantee I am anonymous?</A
+></H3
><P
> No. Your chances of remaining anonymous are greatly improved, but unless you
<A
> Most of <SPAN
CLASS="APPLICATION"
>Privoxy's</SPAN
-> protection can be easily subverted
+> 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
><H3
CLASS="SECT2"
><A
-NAME="AEN802"
-></A
->4.9. A test site says I am not using a Proxy.</H3
+NAME="AEN791"
+>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
CLASS="SECT2"
><A
NAME="TOR"
-></A
>4.10. How do I use Privoxy
- together with Tor?</H3
+ together with Tor?</A
+></H3
><P
> Before you configure <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
-> to use <SPAN
-CLASS="APPLICATION"
->Tor</SPAN
->
- (<A
-HREF="http://tor.eff.org/"
+> to use
+ <A
+HREF="https://www.torproject.org/"
TARGET="_top"
->http://tor.eff.org/</A
->),
+>Tor</A
+>,
please follow the <I
CLASS="CITETITLE"
>User Manual</I
><P
>
If it is, refer to <A
-HREF="http://tor.eff.org/documentation.html.en"
+HREF="https://www.torproject.org/documentation.html"
TARGET="_top"
>Tor's
extensive documentation</A
CLASS="APPLICATION"
>Tor</SPAN
>
- to increase your anonymity level, therefore you should use socks4a,
- to make sure <SPAN
-CLASS="APPLICATION"
->Privoxy's</SPAN
-> DNS requests are
+ to increase your anonymity level, therefore you should use socks4a, to make sure DNS requests are
done through <SPAN
CLASS="APPLICATION"
>Tor</SPAN
></TABLE
></P
><P
-> This is enough to reach the Internet, but additionally you should
+> 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
><P
> Unencrypted connections to systems in these address ranges will
be as (un)secure as the local network is, but the alternative is
- that you can't reach the network at all.
- If you also want to be able to reach servers in your local
- network by using their names, you will need additional
- exceptions that look like this:</P
+ 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"
and that there are no other forward lines, unless you know that you need them. If everything looks good,
refer to
<A
-HREF="http://wiki.noreply.org/noreply/TheOnionRouter/TorFAQ#head-0e1cc2ac330ede8c6ad1ac0d0db0ac163b0e6143"
+HREF="https://wiki.torproject.org/wiki/TheOnionRouter/TorFAQ#head-0e1cc2ac330ede8c6ad1ac0d0db0ac163b0e6143"
TARGET="_top"
>Tor
Faq 4.2</A
><H3
CLASS="SECT2"
><A
-NAME="AEN859"
-></A
+NAME="AEN847"
>4.11. Might some things break because header information or
-content is being altered?</H3
+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
might be very different. There are many, many ways that this can be handled,
so having hard and fast rules, is tricky.</P
><P
-> <SPAN
+> The <SPAN
CLASS="QUOTE"
>"User-Agent"</SPAN
-> is often used in this way to identify
- the browser, and adjust content accordingly. Changing this now (at least not
- further than removing the OS information) is not recommended, since so many
- sites do look for it. You may get undesirable results by changing just this
- one aspect.</P
+> is sometimes used in this way to identify
+ the browser, and adjust content accordingly.</P
><P
> Also, different browsers use different encodings of Russian and Czech
characters, certain web servers convert pages on-the-fly according to the
><H3
CLASS="SECT2"
><A
-NAME="AEN873"
-></A
+NAME="AEN861"
>4.12. Can Privoxy act as a <SPAN
CLASS="QUOTE"
>"caching"</SPAN
> proxy to
-speed up web browsing?</H3
+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
-> for this. And, yes,
- before you ask, <SPAN
+> 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
><H3
CLASS="SECT2"
><A
-NAME="AEN882"
-></A
->4.13. What about as a firewall? Can Privoxy protect me?</H3
+NAME="AEN871"
+>4.13. What about as a firewall? Can Privoxy protect me?</A
+></H3
><P
-> Not in the way you mean, or in the way a true firewall can.
+> 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 not
- protect you from intrusion attempts. It is, of course, perfectly possible
- and recommended to use <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"
><H3
CLASS="SECT2"
><A
-NAME="AEN887"
-></A
+NAME="AEN876"
>4.14. I have large empty spaces / a checkerboard pattern now where
-ads used to be. Why?</H3
+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
><H3
CLASS="SECT2"
><A
-NAME="AEN895"
-></A
->4.15. How can Privoxy filter Secure (HTTPS) URLs?</H3
+NAME="AEN884"
+>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
><H3
CLASS="SECT2"
><A
-NAME="AEN909"
-></A
+NAME="AEN898"
>4.16. Privoxy runs as a <SPAN
CLASS="QUOTE"
>"server"</SPAN
>. How
-secure is it? Do I need to take any special precautions?</H3
+secure is it? Do I need to take any special precautions?</A
+></H3
><P
-> There are no known exploits that might affect
- <SPAN
-CLASS="APPLICATION"
->Privoxy</SPAN
->. On Unix-like systems,
- <SPAN
+> 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
+ user, which is how we recommend it be run. Also, by default
<SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
-> only listens to requests
- from <SPAN
+> listens to requests from <SPAN
CLASS="QUOTE"
>"localhost"</SPAN
-> only. The server aspect of
- <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
+> is not itself directly
+ exposed to the Internet in this configuration. If you want to have
<SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
CLASS="SECT2"
><A
NAME="TURNOFF"
-></A
->4.17. How can I temporarily disable Privoxy?</H3
+>4.17. How can I temporarily disable Privoxy?</A
+></H3
><P
> The easiest way is to access <SPAN
CLASS="APPLICATION"
CLASS="SECT2"
><A
NAME="REALLYOFF"
-></A
>4.18. When <SPAN
CLASS="QUOTE"
>"disabled"</SPAN
> is Privoxy totally
-out of the picture?</H3
+out of the picture?</A
+></H3
><P
-> No, this just means all filtering and actions are disabled.
+> No, this just means all optional filtering and actions are disabled.
<SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
CLASS="SECT2"
><A
NAME="TURNOFF2"
-></A
->4.19. How can I tell Privoxy to totally ignore certain sites?</H3
+>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="SECT2"
><A
NAME="CRUNCH"
-></A
>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
->?</H3
+>?</A
+></H3
><P
> A <SPAN
CLASS="QUOTE"
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"
CLASS="SECT2"
><A
NAME="DOWNLOADS"
-></A
>4.21. Can Privoxy effect files that I download
-from a webserver? FTP server?</H3
+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
> knows the differences in files according
to the <SPAN
CLASS="QUOTE"
->"Document Type"</SPAN
+>"Content Type"</SPAN
> as reported by the webserver. If this is
reported accurately (e.g. <SPAN
CLASS="QUOTE"
> In short, filtering is <SPAN
CLASS="QUOTE"
>"ON"</SPAN
-> if a) the Document Type as reported
+> if a) the content type as reported
by the webserver is appropriate <SPAN
CLASS="emphasis"
><I
<SPAN
CLASS="QUOTE"
>"bad"</SPAN
->. It's the configuration that let's it all happen or not.</P
+>. 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
CLASS="SECT2"
><A
NAME="DOWNLOADS2"
-></A
>4.22. I just downloaded a Perl script, and Privoxy
-altered it! Yikes, what is wrong!</H3
+altered it! Yikes, what is wrong!</A
+></H3
><P
> Please read above.</P
></DIV
CLASS="SECT2"
><A
NAME="HOSTSFILE"
-></A
>4.23. Should I continue to use a <SPAN
CLASS="QUOTE"
>"HOSTS"</SPAN
-> file for ad-blocking?</H3
+> 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
CLASS="FILENAME"
>HOSTS</TT
> file, in fact, not only
- duplicates effort, but may get in the way. It is recommended to remove
- such entries from your <TT
+ 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
CLASS="SECT2"
><A
NAME="SEEALSO"
-></A
>4.24. Where can I find more information about Privoxy
-and related issues?</H3
+and related issues?</A
+></H3
><P
> Other references and sites of interest to <SPAN
CLASS="APPLICATION"
HREF="http://www.squid-cache.org/"
TARGET="_top"
>http://www.squid-cache.org/</A
->, a very popular
+>, a popular
caching proxy, which is often used together with <SPAN
CLASS="APPLICATION"
>Privoxy</SPAN
><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="http://tor.eff.org/"
TARGET="_top"
>http://tor.eff.org/</A
CLASS="SECT2"
><A
NAME="MICROSUCK"
-></A
>4.25. I've noticed that Privoxy changes <SPAN
CLASS="QUOTE"
>"Microsoft"</SPAN
<SPAN
CLASS="QUOTE"
>"MicroSuck"</SPAN
->! Why are you manipulating my browsing?</H3
+>! 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
> 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"
projects / privoxy.git / blobdiff