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+<p class="apache">Apache HTTP Server Version 2.4</p>
+<img alt="" src="../images/feather.png" /></div>
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+<a href="http://www.apache.org/">Apache</a> &gt; <a href="http://httpd.apache.org/">HTTP Server</a> &gt; <a href="http://httpd.apache.org/docs/">Documentation</a> &gt; <a href="../">Version 2.4</a> &gt; <a href="./">Modules</a></div>
+<div id="page-content">
+<div id="preamble"><h1>Apache Module mod_log_config</h1>
+<div class="toplang">
+<p><span>Available Languages: </span><a href="../en/mod/mod_log_config.html" title="English">&nbsp;en&nbsp;</a> |
+<a href="../fr/mod/mod_log_config.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a> |
+<a href="../ja/mod/mod_log_config.html" hreflang="ja" rel="alternate" title="Japanese">&nbsp;ja&nbsp;</a> |
+<a href="../ko/mod/mod_log_config.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a> |
+<a href="../tr/mod/mod_log_config.html" hreflang="tr" rel="alternate" title="Türkçe">&nbsp;tr&nbsp;</a></p>
+</div>
+<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Logging of the requests made to the server</td></tr>
+<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Base</td></tr>
+<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>log_config_module</td></tr>
+<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_log_config.c</td></tr></table>
+<h3>Summary</h3>
+
+ <p>This module provides for flexible logging of client
+ requests. Logs are written in a customizable format, and may be
+ written directly to a file, or to an external program.
+ Conditional logging is provided so that individual requests may
+ be included or excluded from the logs based on characteristics
+ of the request.</p>
+
+ <p>Three directives are provided by this module:
+ <code class="directive"><a href="#transferlog">TransferLog</a></code> to create
+ a log file, <code class="directive"><a href="#logformat">LogFormat</a></code>
+ to set a custom format, and <code class="directive"><a href="#customlog">CustomLog</a></code> to define a log file and format in one
+ step. The <code class="directive">TransferLog</code> and <code class="directive">CustomLog</code> directives can be used multiple times in each
+ server to cause each request to be logged to multiple files.</p>
+</div>
+<div id="quickview"><a href="https://www.apache.org/foundation/contributing.html" class="badge"><img src="https://www.apache.org/images/SupportApache-small.png" alt="Support Apache!" /></a><h3>Topics</h3>
+<ul id="topics">
+<li><img alt="" src="../images/down.gif" /> <a href="#formats">Custom Log Formats</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#security">Security Considerations</a></li>
+</ul><h3 class="directives">Directives</h3>
+<ul id="toc">
+<li><img alt="" src="../images/down.gif" /> <a href="#bufferedlogs">BufferedLogs</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#customlog">CustomLog</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#globallog">GlobalLog</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#logformat">LogFormat</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#transferlog">TransferLog</a></li>
+</ul>
+<h3>Bugfix checklist</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">httpd changelog</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&amp;list_id=144532&amp;product=Apache%20httpd-2&amp;query_format=specific&amp;order=changeddate%20DESC%2Cpriority%2Cbug_severity&amp;component=mod_log_config">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&amp;component=mod_log_config">Report a bug</a></li></ul><h3>See also</h3>
+<ul class="seealso">
+<li><a href="../logs.html">Apache Log Files</a></li>
+<li><a href="#comments_section">Comments</a></li></ul></div>
+<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="formats" id="formats">Custom Log Formats</a></h2>
+
+ <p>The format argument to the <code class="directive"><a href="#logformat">LogFormat</a></code> and <code class="directive"><a href="#customlog">CustomLog</a></code> directives is a string. This string is
+ used to log each request to the log file. It can contain literal
+ characters copied into the log files and the C-style control
+ characters "\n" and "\t" to represent new-lines and tabs.
+ Literal quotes and backslashes should be escaped with
+ backslashes.</p>
+
+ <p>The characteristics of the request itself are logged by
+ placing "<code>%</code>" directives in the format string, which are
+ replaced in the log file by the values as follows:</p>
+
+ <table class="bordered"><tr class="header"><th>Format&nbsp;String</th>
+ <th>Description</th></tr>
+<tr><td><code>%%</code></td>
+ <td>The percent sign.</td></tr>
+<tr class="odd"><td><code>%a</code></td>
+ <td>Client IP address of the request (see the
+ <code class="module"><a href="../mod/mod_remoteip.html">mod_remoteip</a></code> module).</td></tr>
+<tr><td><code>%{c}a</code></td>
+ <td>Underlying peer IP address of the connection (see the
+ <code class="module"><a href="../mod/mod_remoteip.html">mod_remoteip</a></code> module).</td></tr>
+<tr class="odd"><td><code>%A</code></td>
+ <td>Local IP-address.</td></tr>
+<tr><td><code>%B</code></td>
+ <td>Size of response in bytes, excluding HTTP headers.</td></tr>
+<tr class="odd"><td><code>%b</code></td>
+ <td>Size of response in bytes, excluding HTTP headers. In CLF format, <em>i.e.</em>
+ a '<code>-</code>' rather than a 0 when no bytes are sent.</td></tr>
+<tr><td><code>%{<var>VARNAME</var>}C</code></td>
+ <td>The contents of cookie <var>VARNAME</var> in the request sent
+ to the server. Only version 0 cookies are fully supported.</td></tr>
+<tr class="odd"><td><code>%D</code></td>
+ <td>The time taken to serve the request, in microseconds.</td></tr>
+<tr><td><code>%{<var>VARNAME</var>}e</code></td>
+ <td>The contents of the environment variable
+ <var>VARNAME</var>.</td></tr>
+<tr class="odd"><td><code>%f</code></td>
+ <td>Filename.</td></tr>
+<tr><td><code>%h</code></td>
+ <td>Remote hostname. Will log the IP address if <code class="directive"><a href="../mod/core.html#hostnamelookups">HostnameLookups</a></code> is set to
+ <code>Off</code>, which is the default. If it logs the hostname
+ for only a few hosts, you probably have access control
+ directives mentioning them by name. See <a href="mod_authz_host.html#reqhost">the Require host
+ documentation</a>.</td></tr>
+<tr class="odd"><td><code>%{c}h</code></td>
+ <td>Like <code>%h</code>, but always reports on the hostname of the
+ underlying TCP connection and not any modifications to the
+ remote hostname by modules like <code class="module"><a href="../mod/mod_remoteip.html">mod_remoteip</a></code>.</td></tr>
+<tr><td><code>%H</code></td>
+ <td>The request protocol.</td></tr>
+<tr class="odd"><td><code>%{<var>VARNAME</var>}i</code></td>
+ <td>The contents of <code><var>VARNAME</var>:</code> header line(s)
+ in the request sent to the server. Changes made by other
+ modules (e.g. <code class="module"><a href="../mod/mod_headers.html">mod_headers</a></code>) affect this. If you're
+ interested in what the request header was prior to when most
+ modules would have modified it, use <code class="module"><a href="../mod/mod_setenvif.html">mod_setenvif</a></code>
+ to copy the header into an internal environment variable and log
+ that value with the <code>%{<var>VARNAME</var>}e</code> described
+ above.
+ </td></tr>
+<tr><td><code>%k</code></td>
+ <td>Number of keepalive requests handled on this connection. Interesting if
+ <code class="directive"><a href="../mod/core.html#keepalive">KeepAlive</a></code> is being used, so that,
+ for example, a '1' means the first keepalive request after the initial
+ one, '2' the second, etc...;
+ otherwise this is always 0 (indicating the initial request).</td></tr>
+<tr class="odd"><td><code>%l</code></td>
+ <td>Remote logname (from identd, if supplied). This will return a
+ dash unless <code class="module"><a href="../mod/mod_ident.html">mod_ident</a></code> is present and <code class="directive"><a href="../mod/mod_ident.html#identitycheck">IdentityCheck</a></code> is set
+ <code>On</code>.</td></tr>
+<tr><td><code>%L</code></td>
+ <td>The request log ID from the error log (or '-' if nothing has been
+ logged to the error log for this request). Look for the
+ matching error log line to see what request caused what error.</td></tr>
+<tr class="odd"><td><code>%m</code></td>
+ <td>The request method.</td></tr>
+<tr><td><code>%{<var>VARNAME</var>}n</code></td>
+ <td>The contents of note <var>VARNAME</var> from another
+ module.</td></tr>
+<tr class="odd"><td><code>%{<var>VARNAME</var>}o</code></td>
+ <td>The contents of <code><var>VARNAME</var>:</code> header line(s)
+ in the reply.</td></tr>
+<tr><td><code>%p</code></td>
+ <td>The canonical port of the server serving the request.</td></tr>
+<tr class="odd"><td><code>%{<var>format</var>}p</code></td>
+ <td>The canonical port of the server serving the request, or the
+ server's actual port, or the client's actual port. Valid formats
+ are <code>canonical</code>, <code>local</code>, or <code>remote</code>.
+ </td></tr>
+<tr><td><code>%P</code></td>
+ <td>The process ID of the child that serviced the request.</td></tr>
+<tr class="odd"><td><code>%{<var>format</var>}P</code></td>
+ <td>The process ID or thread ID of the child that serviced the
+ request. Valid formats are <code>pid</code>, <code>tid</code>,
+ and <code>hextid</code>.
+ </td></tr>
+<tr><td><code>%q</code></td>
+ <td>The query string (prepended with a <code>?</code> if a query
+ string exists, otherwise an empty string).</td></tr>
+<tr class="odd"><td><code>%r</code></td>
+ <td>First line of request.</td></tr>
+<tr><td><code>%R</code></td>
+ <td>The handler generating the response (if any).</td></tr>
+<tr class="odd"><td><code>%s</code></td>
+ <td>Status. For requests that have been internally redirected, this is
+ the status of the <em>original</em> request. Use <code>%&gt;s</code>
+ for the final status.</td></tr>
+<tr><td><code>%t</code></td>
+ <td>Time the request was received, in the format <code>[18/Sep/2011:19:18:28 -0400]</code>.
+ The last number indicates the timezone offset from GMT</td></tr>
+<tr class="odd"><td><code>%{<var>format</var>}t</code></td>
+ <td>The time, in the form given by format, which should be in
+ an extended <code>strftime(3)</code> format (potentially localized).
+ If the format starts with <code>begin:</code> (default) the time is taken
+ at the beginning of the request processing. If it starts with
+ <code>end:</code> it is the time when the log entry gets written,
+ close to the end of the request processing. In addition to the formats
+ supported by <code>strftime(3)</code>, the following format tokens are
+ supported:
+ <table>
+ <tr><td><code>sec</code></td><td>number of seconds since the Epoch</td></tr>
+ <tr><td><code>msec</code></td><td>number of milliseconds since the Epoch</td></tr>
+ <tr><td><code>usec</code></td><td>number of microseconds since the Epoch</td></tr>
+ <tr><td><code>msec_frac</code></td><td>millisecond fraction</td></tr>
+ <tr><td><code>usec_frac</code></td><td>microsecond fraction</td></tr>
+ </table>
+ These tokens can not be combined with each other or <code>strftime(3)</code>
+ formatting in the same format string. You can use multiple
+ <code>%{<var>format</var>}t</code> tokens instead.
+ </td></tr>
+<tr><td><code>%T</code></td>
+ <td>The time taken to serve the request, in seconds.</td></tr>
+<tr class="odd"><td><code>%{<var>UNIT</var>}T</code></td>
+ <td>The time taken to serve the request, in a time unit given by
+ <code>UNIT</code>. Valid units are <code>ms</code> for milliseconds,
+ <code>us</code> for microseconds, and <code>s</code> for seconds.
+ Using <code>s</code> gives the same result as <code>%T</code>
+ without any format; using <code>us</code> gives the same result
+ as <code>%D</code>. Combining <code>%T</code> with a unit is
+ available in 2.4.13 and later.</td></tr>
+<tr><td><code>%u</code></td>
+ <td>Remote user if the request was authenticated. May be bogus if return status
+ (<code>%s</code>) is 401 (unauthorized).</td></tr>
+<tr class="odd"><td><code>%U</code></td>
+ <td>The URL path requested, not including any query string.</td></tr>
+<tr><td><code>%v</code></td>
+ <td>The canonical <code class="directive"><a href="../mod/core.html#servername">ServerName</a></code>
+ of the server serving the request.</td></tr>
+<tr class="odd"><td><code>%V</code></td>
+ <td>The server name according to the <code class="directive"><a href="../mod/core.html#usecanonicalname">UseCanonicalName</a></code> setting.</td></tr>
+<tr><td><code>%X</code></td>
+ <td>Connection status when response is completed:
+
+ <table>
+
+ <tr><td><code>X</code> =</td>
+ <td>Connection aborted before the response completed.</td></tr>
+ <tr><td><code>+</code> =</td>
+ <td>Connection may be kept alive after the response is
+ sent.</td></tr>
+ <tr><td><code>-</code> = </td>
+ <td>Connection will be closed after the response is
+ sent.</td></tr>
+ </table>
+
+ </td></tr>
+<tr class="odd"><td><code>%I</code></td>
+ <td>Bytes received, including request and headers. Cannot be zero.
+ You need to enable <code class="module"><a href="../mod/mod_logio.html">mod_logio</a></code> to use this.</td></tr>
+<tr><td><code>%O</code></td>
+ <td>Bytes sent, including headers. May be zero in rare cases
+ such as when a request is aborted before a response is sent.
+ You need to enable <code class="module"><a href="../mod/mod_logio.html">mod_logio</a></code> to use this.</td></tr>
+<tr class="odd"><td><code>%S</code></td>
+ <td>Bytes transferred (received and sent), including request and headers,
+ cannot be zero. This is the combination of %I and %O. You need to
+ enable <code class="module"><a href="../mod/mod_logio.html">mod_logio</a></code> to use this.</td></tr>
+<tr><td><code>%{<var>VARNAME</var>}^ti</code></td>
+ <td>The contents of <code><var>VARNAME</var>:</code> trailer line(s)
+ in the request sent to the server. </td></tr>
+<tr class="odd"><td><code>%{<var>VARNAME</var>}^to</code></td>
+ <td>The contents of <code><var>VARNAME</var>:</code> trailer line(s)
+ in the response sent from the server. </td></tr>
+</table>
+
+ <h3><a name="modifiers" id="modifiers">Modifiers</a></h3>
+
+ <p>Particular items can be restricted to print only for
+ responses with specific HTTP status codes by placing a
+ comma-separated list of status codes immediately following the
+ "%". The status code list may be preceded by a "<code>!</code>" to
+ indicate negation.</p>
+
+ <table class="bordered"><tr class="header"><th>Format String</th>
+ <th>Meaning</th></tr>
+<tr>
+ <td><code>%400,501{User-agent}i</code></td>
+ <td>Logs <code>User-agent</code> on 400 errors and 501 errors only. For
+ other status codes, the literal string <code>"-"</code> will be
+ logged.</td></tr>
+<tr class="odd"><td><code>%!200,304,302{Referer}i</code></td>
+ <td>Logs <code>Referer</code> on all requests that do
+ <em>not</em> return one of the three specified codes,
+ "<code>-</code>" otherwise.
+ </td></tr>
+</table>
+
+ <p>The modifiers "&lt;" and "&gt;" can be used for requests that
+ have been internally redirected to choose whether the original
+ or final (respectively) request should be consulted. By
+ default, the <code>%</code> directives <code>%s, %U, %T,
+ %D,</code> and <code>%r</code> look at the original request
+ while all others look at the final request. So for example,
+ <code>%&gt;s</code> can be used to record the final status of
+ the request and <code>%&lt;u</code> can be used to record the
+ original authenticated user on a request that is internally
+ redirected to an unauthenticated resource.</p>
+
+
+
+ <h3><a name="format-notes" id="format-notes">Format Notes</a></h3>
+
+ <p>For security reasons, starting with version 2.0.46,
+ non-printable and other special characters in <code>%r</code>,
+ <code>%i</code> and <code>%o</code> are escaped using
+ <code>\x<var>hh</var></code> sequences, where <var>hh</var>
+ stands for the hexadecimal representation of the raw
+ byte. Exceptions from this rule are <code>"</code> and
+ <code>\</code>, which are escaped by prepending a backslash, and
+ all whitespace characters, which are written in their C-style
+ notation (<code>\n</code>, <code>\t</code>, etc). In versions
+ prior to 2.0.46, no escaping was performed on these strings so
+ you had to be quite careful when dealing with raw log files.</p>
+
+ <p>Since httpd 2.0, unlike 1.3, the <code>%b</code> and
+ <code>%B</code> format strings do not represent the number of
+ bytes sent to the client, but simply the size in bytes of the
+ HTTP response (which will differ, for instance, if the
+ connection is aborted, or if SSL is used). The <code>%O</code>
+ format provided by <code class="module"><a href="../mod/mod_logio.html">mod_logio</a></code> will log the
+ actual number of bytes sent over the network.</p>
+
+ <div class="note">
+ <p>Note: <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> is implemented as a
+ quick-handler and not as a standard handler. Therefore, the
+ <code>%R</code> format string will not return any handler
+ information when content caching is involved.</p>
+ </div>
+
+
+
+ <h3><a name="examples" id="examples">Examples</a></h3>
+
+ <p>Some commonly used log format strings are:</p>
+
+ <dl>
+ <dt>Common Log Format (CLF)</dt>
+ <dd><code>"%h %l %u %t \"%r\" %&gt;s %b"</code></dd>
+
+ <dt>Common Log Format with Virtual Host</dt>
+ <dd><code>"%v %h %l %u %t \"%r\" %&gt;s %b"</code></dd>
+
+ <dt>NCSA extended/combined log format</dt>
+ <dd><code>"%h %l %u %t \"%r\" %&gt;s %b \"%{Referer}i\"
+ \"%{User-agent}i\""</code></dd>
+
+ <dt>Referer log format</dt>
+ <dd><code>"%{Referer}i -&gt; %U"</code></dd>
+
+ <dt>Agent (Browser) log format</dt>
+ <dd><code>"%{User-agent}i"</code></dd>
+ </dl>
+
+ <p>You can use the <code>%{format}t</code> directive multiple
+ times to build up a time format using the extended format tokens
+ like <code>msec_frac</code>:</p>
+ <dl>
+<dt>Timestamp including milliseconds</dt>
+<dd><code>"%{%d/%b/%Y %T}t.%{msec_frac}t %{%z}t"</code></dd>
+
+ </dl>
+
+
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="security" id="security">Security Considerations</a></h2>
+ <p>See the <a href="../misc/security_tips.html#serverroot">security tips</a>
+ document for details on why your security could be compromised
+ if the directory where logfiles are stored is writable by
+ anyone other than the user that starts the server.</p>
+</div>
+<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="directive-section"><h2><a name="BufferedLogs" id="BufferedLogs">BufferedLogs</a> <a name="bufferedlogs" id="bufferedlogs">Directive</a></h2>
+<table class="directive">
+<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Buffer log entries in memory before writing to disk</td></tr>
+<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>BufferedLogs On|Off</code></td></tr>
+<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>BufferedLogs Off</code></td></tr>
+<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
+<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
+<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_log_config</td></tr>
+</table>
+ <p>The <code class="directive">BufferedLogs</code> directive causes
+ <code class="module"><a href="../mod/mod_log_config.html">mod_log_config</a></code> to store several log entries in
+ memory and write them together to disk, rather than writing them
+ after each request. On some systems, this may result in more
+ efficient disk access and hence higher performance. It may be
+ set only once for the entire server; it cannot be configured
+ per virtual-host.</p>
+
+ <div class="note">This directive should be used with caution as a crash might
+ cause loss of logging data.</div>
+
+</div>
+<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="directive-section"><h2><a name="CustomLog" id="CustomLog">CustomLog</a> <a name="customlog" id="customlog">Directive</a></h2>
+<table class="directive">
+<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets filename and format of log file</td></tr>
+<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CustomLog <var>file</var>|<var>pipe</var>
+<var>format</var>|<var>nickname</var>
+[env=[!]<var>environment-variable</var>|
+expr=<var>expression</var>]</code></td></tr>
+<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
+<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
+<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_log_config</td></tr>
+</table>
+ <p>The <code class="directive">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><var>file</var></dt>
+ <dd>A filename, relative to the <code class="directive"><a href="../mod/core.html#serverroot">ServerRoot</a></code>.</dd>
+
+ <dt><var>pipe</var></dt>
+ <dd>The pipe character "<code>|</code>", followed by the path
+ to a program to receive the log information on its standard
+ input. See the notes on <a href="../logs.html#piped">piped logs</a>
+ for more information.
+
+ <div class="warning"><h3>Security:</h3>
+ <p>If a program is used, then it will be run as the user who
+ started <code class="program"><a href="../programs/httpd.html">httpd</a></code>. This will be root if the server was
+ started by root; be sure that the program is secure.</p>
+ </div>
+ <div class="warning"><h3>Note</h3>
+ <p>When entering a file path on non-Unix platforms, care should be taken
+ to make sure that only forward slashed are used even though the platform
+ may allow the use of back slashes. In general it is a good idea to always
+ use forward slashes throughout the configuration files.</p>
+ </div></dd>
+ </dl>
+
+ <p>The second argument specifies what will be written to the
+ log file. It can specify either a <var>nickname</var> defined by
+ a previous <code class="directive"><a href="#logformat">LogFormat</a></code>
+ directive, or it can be an explicit <var>format</var> 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 class="prettyprint lang-config"># 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. The condition can be the
+ presence or absence (in the case of a '<code>env=!<var>name</var></code>'
+ clause) of a particular variable in the server
+ <a href="../env.html">environment</a>. Alternatively, the condition
+ can be expressed as arbitrary boolean <a href="../expr.html">expression</a>. If the condition is not satisfied, the request
+ will not be logged. References to HTTP headers in the expression
+ will not cause the header names to be added to the Vary header.</p>
+
+ <p>Environment variables can be set on a per-request
+ basis using the <code class="module"><a href="../mod/mod_setenvif.html">mod_setenvif</a></code>
+ and/or <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code> 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 class="prettyprint lang-config">SetEnvIf Request_URI \.gif$ gif-image
+CustomLog "gif-requests.log" common env=gif-image
+CustomLog "nongif-requests.log" common env=!gif-image</pre>
+
+
+ <p>Or, to reproduce the behavior of the old RefererIgnore
+ directive, you might use the following:</p>
+
+ <pre class="prettyprint lang-config">SetEnvIf Referer example\.com localreferer
+CustomLog "referer.log" referer env=!localreferer</pre>
+
+
+</div>
+<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="directive-section"><h2><a name="GlobalLog" id="GlobalLog">GlobalLog</a> <a name="globallog" id="globallog">Directive</a></h2>
+<table class="directive">
+<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets filename and format of log file</td></tr>
+<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>GlobalLog<var>file</var>|<var>pipe</var>
+<var>format</var>|<var>nickname</var>
+[env=[!]<var>environment-variable</var>|
+expr=<var>expression</var>]</code></td></tr>
+<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
+<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
+<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_log_config</td></tr>
+<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache HTTP Server 2.4.19 and later</td></tr>
+</table>
+
+ <p>The <code class="directive">GlobalLog</code> directive defines a log shared
+ by the main server configuration and all defined virtual hosts.</p>
+
+ <p>The <code class="directive">GlobalLog</code> directive is identical to
+ the <code class="directive">CustomLog</code> directive, apart from the following
+ differences:</p>
+ <ul>
+ <li><code class="directive">GlobalLog</code> is not valid in virtual host
+ context.</li>
+ <li><code class="directive">GlobalLog</code> is used by virtual hosts that
+ define their own <code class="directive">CustomLog</code>, unlike a
+ globally specified <code class="directive">CustomLog</code>.</li>
+ </ul>
+
+</div>
+<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="directive-section"><h2><a name="LogFormat" id="LogFormat">LogFormat</a> <a name="logformat" id="logformat">Directive</a></h2>
+<table class="directive">
+<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Describes a format for use in a log file</td></tr>
+<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LogFormat <var>format</var>|<var>nickname</var>
+[<var>nickname</var>]</code></td></tr>
+<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>LogFormat "%h %l %u %t \"%r\" %&gt;s %b"</code></td></tr>
+<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
+<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
+<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_log_config</td></tr>
+</table>
+ <p>This directive specifies the format of the access log
+ file.</p>
+
+ <p>The <code class="directive">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 <code class="directive">TransferLog</code>
+ directives. The single argument can specify an explicit
+ <var>format</var> as discussed in the <a href="#formats">custom log
+ formats</a> section above. Alternatively, it can use a
+ <var>nickname</var> to refer to a log format defined in a
+ previous <code class="directive">LogFormat</code> directive as described
+ below.</p>
+
+ <p>The second form of the <code class="directive">LogFormat</code>
+ directive associates an explicit <var>format</var> with a
+ <var>nickname</var>. This <var>nickname</var> can then be used in
+ subsequent <code class="directive">LogFormat</code> or
+ <code class="directive"><a href="#customlog">CustomLog</a></code> directives
+ rather than repeating the entire format string. A
+ <code class="directive">LogFormat</code> directive that 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
+ <code class="directive"><a href="#transferlog">TransferLog</a></code> directives.
+ In addition, <code class="directive">LogFormat</code> cannot use one nickname
+ to define another nickname. Note that the nickname should not contain
+ percent signs (<code>%</code>).</p>
+
+ <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">LogFormat "%v %h %l %u %t \"%r\" %&gt;s %b" vhost_common</pre>
+</div>
+
+
+</div>
+<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="directive-section"><h2><a name="TransferLog" id="TransferLog">TransferLog</a> <a name="transferlog" id="transferlog">Directive</a></h2>
+<table class="directive">
+<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Specify location of a log file</td></tr>
+<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>TransferLog <var>file</var>|<var>pipe</var></code></td></tr>
+<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
+<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
+<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_log_config</td></tr>
+</table>
+ <p>This directive has exactly the same arguments and effect as
+ the <code class="directive"><a href="#customlog">CustomLog</a></code>
+ 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
+ <code class="directive"><a href="#logformat">LogFormat</a></code> directive
+ which does not define a nickname. Common Log Format is used if no
+ other format has been specified.</p>
+
+ <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">LogFormat "%h %l %u %t \"%r\" %&gt;s %b \"%{Referer}i\" \"%{User-agent}i\""
+TransferLog logs/access_log</pre>
+</div>
+
+</div>
+</div>
+<div class="bottomlang">
+<p><span>Available Languages: </span><a href="../en/mod/mod_log_config.html" title="English">&nbsp;en&nbsp;</a> |
+<a href="../fr/mod/mod_log_config.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a> |
+<a href="../ja/mod/mod_log_config.html" hreflang="ja" rel="alternate" title="Japanese">&nbsp;ja&nbsp;</a> |
+<a href="../ko/mod/mod_log_config.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a> |
+<a href="../tr/mod/mod_log_config.html" hreflang="tr" rel="alternate" title="Türkçe">&nbsp;tr&nbsp;</a></p>
+</div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&amp;A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Libera.chat, or sent to our <a href="https://httpd.apache.org/lists.html">mailing lists</a>.</div>
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