Add Q&A about logging Referer: and User-Agent: headers.

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  <H1>Apache Server Frequently Asked Questions</H1>

  <P>

  $Revision: 1.51 $ ($Date: 1997/05/04 16:44:08 $)

  $Revision: 1.52 $ ($Date: 1997/05/04 17:05:25 $)

  </P>

  <P>

  The latest version of this FAQ is always available from the main

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   <LI><A HREF="#cantbuild">Why won't Apache compile with my

    system's <SAMP>cc</SAMP>?</A>

   </LI>

   <LI><A HREF="#addlog">How do I add browsers and referrers to my

    logs?</A>

   </LI>

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</UL>

  & OS versions and exact error messages.

  </P>

  <HR>

 </LI>

 <LI><A NAME="addlog">

      <STRONG>How do I add browsers and referrers to my logs?</STRONG>

     </A>

  <P>

  Apache provides a couple of different ways of doing this.  The

  recommended method is to compile the

  <A

   HREF="../mod/mod_log_config.html"

  ><SAMP>mod_log_config</SAMP></A>

  module into your configuration and use the

  <A

   HREF="../mod/mod_log_config.html#customlog"

  ><SAMP>CustomLog</SAMP></A>

  directive.

  </P>

  <P>

  You can either log the additional information in files other than your

  normal transfer log, or you can add them to the records already being

  written.  For example:

  </P>

  <P>

  <CODE>

   CustomLog logs/access_log "%h %l %u %t \"%r\" %s %b \"%{Referer}i\" \"%{User-Agent}i\""

  </CODE>

  </P>

  <P>

  This will add the values of the <SAMP>User-agent:</SAMP> and

  <SAMP>Referer:</SAMP> headers, which indicate the client and the

  referring page, respectively, to the end of each line in the access

  log.

  </P>

  <HR>

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 </LI>

</OL>