mod_log_config.html.en

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      not. This is configurable on a per-logfile
      basis.</li>

      <li>Beginning with Apache 1.3.5, the mod_log_config module
      has also subsumed the <code>RefererIgnore</code>
      functionality from <a
      href="mod_log_referer.html">mod_log_referer</a>. The effect
      of <code>RefererIgnore</code> can be achieved by combinations
      of <a href="mod_setenvif.html"><code>SetEnvIf</code></a>
      directives and conditional <code>CustomLog</code>
      definitions.</li>
    </ul>
    <hr />

    <h2><a id="cookielog" name="cookielog">CookieLog</a>
    directive</h2>

    <p><a href="directive-dict.html#Syntax"
    rel="Help"><strong>Syntax:</strong></a> CookieLog
    <em>filename</em><br />
     <a href="directive-dict.html#Context"
    rel="Help"><strong>Context:</strong></a> server config, virtual
    host<br />
     <a href="directive-dict.html#Module"
    rel="Help"><strong>Module:</strong></a> mod_cookies<br />
     <a href="directive-dict.html#Compatibility"
    rel="Help"><strong>Compatibility:</strong></a> Only available
    in Apache 1.2 and above</p>

    <p>The CookieLog directive sets the filename for logging of
    cookies. The filename is relative to the <a
    href="core.html#serverroot">ServerRoot</a>. This directive is
    included only for compatibility with <a
    href="mod_cookies.html">mod_cookies</a>, and is deprecated.</p>
    <hr />

    <h2><a id="customlog" name="customlog">CustomLog</a> <a
    id="customlog-conditional"
    name="customlog-conditional">directive</a></h2>

    <p><a href="directive-dict.html#Syntax"
    rel="Help"><strong>Syntax:</strong></a> CustomLog
    <em>file</em>|<em>pipe</em> <em>format</em>|<em>nickname</em>
    [env=[!]<em>environment-variable</em>]<br />
     <a href="directive-dict.html#Context"
    rel="Help"><strong>Context:</strong></a> server config, virtual
    host<br />
     <a href="directive-dict.html#Status"
    rel="Help"><strong>Status:</strong></a> Base<br />
     <a href="directive-dict.html#Compatibility"
    rel="Help"><strong>Compatibility:</strong></a> Nickname only
    available in Apache 1.3 or later. Conditional logging available
    in 1.3.5 or later.<br />
     <a href="directive-dict.html#Module"
    rel="Help"><strong>Module:</strong></a> mod_log_config</p>

    <p>The <code>CustomLog</code> directive is used to log requests
    to the server. A log format is specified, and the logging can
    optionally be made conditional on request characteristics using
    environment variables.</p>

    <p>The first argument, which specifies the location to which
    the logs will be written, can take one of the following two
    types of values:</p>

    <dl>
      <dt><em>file</em></dt>

      <dd>A filename, relative to the <a
      href="core.html#serverroot">ServerRoot</a>.</dd>

      <dt><em>pipe</em></dt>

      <dd>The pipe character "<code>|</code>", followed by the path
      to a program to receive the log information on its standard
      input. <strong>Security:</strong> if a program is used, then
      it will be run as the user who started httpd. This will be
      root if the server was started by root; be sure that the
      program is secure.</dd>
    </dl>

    <p>The second argument specifies what will be written to the
    log file. It can specify either a <em>nickname</em> defined by
    a previous <a href="#logformat">LogFormat</a> directive, or it
    can be an explicit <em>format</em> string as described in the
    <a href="#formats">log formats</a> section.</p>

    <p>For example, the following two sets of directives have
    exactly the same effect:</p>
<pre>
     # CustomLog with format nickname
     LogFormat "%h %l %u %t \"%r\" %&gt;s %b" common
     CustomLog logs/access_log common

     # CustomLog with explicit format string
     CustomLog logs/access_log "%h %l %u %t \"%r\" %&gt;s %b"
</pre>

    <p>The third argument is optional and controls
    whether or not to log a particular request based on the
    presence or absence of a particular variable in the server
    environment. If the specified <a href="../env.html">environment
    variable</a> is set for the request (or is not set, in the case
    of a '<code>env=!<em>name</em></code>' clause), then the
    request will be logged.</p>

    <p>Environment variables can be set on a per-request
    basis using the <a href="mod_setenvif.html">mod_setenvif</a>
    and/or <a href="mod_rewrite.html">mod_rewrite</a> modules. For
    example, if you want to record requests for all GIF
    images on your server in a separate logfile but not in your main
    log, you can use:</p>
<pre>
    SetEnvIf Request_URI \.gif$ gif-image
    CustomLog gif-requests.log common env=gif-image
    CustomLog nongif-requests.log common env=!gif-image
</pre>
    <hr />

    <h2><a id="logformat" name="logformat">LogFormat</a>
    directive</h2>

    <p><a href="directive-dict.html#Syntax"
    rel="Help"><strong>Syntax:</strong></a> LogFormat
    <em>format</em>|<em>nickname</em> [<em>nickname</em>]<br />
     <a href="directive-dict.html#Default"
    rel="Help"><strong>Default:</strong></a> <code>LogFormat "%h %l
    %u %t \"%r\" %&gt;s %b"</code><br />
     <a href="directive-dict.html#Context"
    rel="Help"><strong>Context:</strong></a> server config, virtual
    host<br />
     <a href="directive-dict.html#Status"
    rel="Help"><strong>Status:</strong></a> Base<br />
     <a href="directive-dict.html#Compatibility"
    rel="Help"><strong>Compatibility:</strong></a> Nickname only
    available in Apache 1.3 or later<br />
     <a href="directive-dict.html#Module"
    rel="Help"><strong>Module:</strong></a> mod_log_config</p>

    <p>This directive specifies the format of the access log
    file.</p>

    <p>The <code>LogFormat</code> directive can take one of two
    forms. In the first form, where only one argument is specified,
    this directive sets the log format which will be used by logs
    specified in subsequent <a href="#transferlog">TransferLog</a>
    directives. The single argument can specify an explicit
    <em>format</em> as discussed in the <a href="#formats">custom log
    formats</a> section above. Alternatively, it can use a
    <em>nickname</em> to refer to a log format defined in a
    previous <code>LogFormat</code> directive as described
    below.</p>

    <p>The second form of the <code>LogFormat</code> directive
    associates an explicit <em>format</em> with a
    <em>nickname</em>. This <em>nickname</em> can then be used in
    subsequent <code>LogFormat</code> or <a
    href="#customlog">CustomLog</a> directives rather than
    repeating the entire format string. A <samp>LogFormat</samp>
    directive which defines a nickname <strong>does nothing
    else</strong> -- that is, it <em>only</em> defines the
    nickname, it doesn't actually apply the format and make it the
    default. Therefore, it will not affect subsequent <a
    href="#transferlog">TransferLog</a> directives.</p>

    <p>For example:</p>

    <code>LogFormat "%v %h %l %u %t \"%r\" %&gt;s %b" vhost_common</code>

    <hr />

    <h2><a id="transferlog" name="transferlog">TransferLog</a>
    directive</h2>

    <p><a href="directive-dict.html#Syntax"
    rel="Help"><strong>Syntax:</strong></a> TransferLog
    <em>file</em>|<em>pipe</em><br />
     <a href="directive-dict.html#Default"
    rel="Help"><strong>Default:</strong></a> none<br />
     <a href="directive-dict.html#Context"
    rel="Help"><strong>Context:</strong></a> server config, virtual
    host<br />
     <a href="directive-dict.html#Status"
    rel="Help"><strong>Status:</strong></a> Base<br />
     <a href="directive-dict.html#Module"
    rel="Help"><strong>Module:</strong></a> mod_log_config</p>

    <p>This directive has exactly the same arguments and effect as
    the <a href="#customlog">CustomLog</a> directive, with the
    exception that it does not allow the log format to be specified
    explicitly or for conditional logging of requests. Instead, the
    log format is determined by the most recently specified <a
    href="#logformat">LogFormat</a> directive that does not define
    a nickname. Common Log Format is used if no other format has
    been specified.</p>

    <p>Example:</p>
<pre>
   LogFormat "%h %l %u %t \"%r\" %&gt;s %b \"%{Referer}i\" \"%{User-agent}i\""
   TransferLog logs/access_log
</pre>
        <hr />

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