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171 lines
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<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type" />
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<!--
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This file is generated from xml source: DO NOT EDIT
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XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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-->
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<title>mod_log_debug - Apache HTTP Server Version 2.5</title>
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<link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" />
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<link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" />
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<link href="../style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /><link rel="stylesheet" type="text/css" href="../style/css/prettify.css" />
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<script src="../style/scripts/prettify.min.js" type="text/javascript">
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</script>
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<link href="../images/favicon.ico" rel="shortcut icon" /></head>
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<body>
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<div id="page-header">
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<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/quickreference.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p>
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<p class="apache">Apache HTTP Server Version 2.5</p>
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<img alt="" src="../images/feather.png" /></div>
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<div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div>
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<div id="path">
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<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.5</a> > <a href="./">Modules</a></div>
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<div id="page-content">
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<div id="preamble"><h1>Apache Module mod_log_debug</h1>
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<div class="toplang">
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<p><span>Available Languages: </span><a href="../en/mod/mod_log_debug.html" title="English"> en </a> |
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<a href="../fr/mod/mod_log_debug.html" hreflang="fr" rel="alternate" title="Fran<61>ais"> fr </a></p>
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</div>
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<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Additional configurable debug logging</td></tr>
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<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
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<tr><th><a href="module-dict.html#ModuleIdentifier">Module<EFBFBD>Identifier:</a></th><td>log_debug_module</td></tr>
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<tr><th><a href="module-dict.html#SourceFile">Source<EFBFBD>File:</a></th><td>mod_log_debug.c</td></tr>
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<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.3.14 and later</td></tr></table>
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</div>
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<div id="quickview"><h3>Topics</h3>
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<ul id="topics">
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<li><img alt="" src="../images/down.gif" /> <a href="#examples">Examples</a></li>
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</ul><h3 class="directives">Directives</h3>
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<ul id="toc">
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<li><img alt="" src="../images/down.gif" /> <a href="#logmessage">LogMessage</a></li>
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</ul>
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<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__&list_id=144532&product=Apache%20httpd-2&query_format=specific&order=changeddate%20DESC%2Cpriority%2Cbug_severity&component=mod_log_debug">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_log_debug">Report a bug</a></li></ul><h3>See also</h3>
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<ul class="seealso">
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<li><a href="#comments_section">Comments</a></li></ul></div>
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<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="examples" id="examples">Examples</a></h2>
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<ol>
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<li>
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Log message after request to /foo/* is processed:
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<pre class="prettyprint lang-config"><Location "/foo/">
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<EFBFBD><EFBFBD>LogMessage "/foo/ has been requested"
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</Location></pre>
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</li>
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<li>
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Log message if request to /foo/* is processed in a sub-request:
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<pre class="prettyprint lang-config"><Location "/foo/">
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<EFBFBD><EFBFBD>LogMessage "subrequest to /foo/" hook=type_checker "expr=-T %{IS_SUBREQ}"
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</Location></pre>
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The default log_transaction hook is not executed for sub-requests,
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therefore we have to use a different hook.
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</li>
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<li>
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Log message if an IPv6 client causes a request timeout:
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<pre class="prettyprint lang-config">LogMessage "IPv6 timeout from %{REMOTE_ADDR}" "expr=-T %{IPV6} && %{REQUEST_STATUS} = 408"</pre>
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Note the placing of the double quotes for the <code>expr=</code> argument.
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</li>
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<li>
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Log the value of the "X-Foo" request environment variable in each
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stage of the request:
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<pre class="prettyprint lang-config"><Location "/">
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<EFBFBD><EFBFBD>LogMessage "%{reqenv:X-Foo}" hook=all
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</Location></pre>
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Together with microsecond time stamps in the error log,
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<code>hook=all</code> also lets you determine the times spent
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in the different parts of the request processing.
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</li>
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</ol>
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</div>
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<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="directive-section"><h2><a name="LogMessage" id="LogMessage">LogMessage</a> <a name="logmessage" id="logmessage">Directive</a></h2>
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<table class="directive">
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<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Log user-defined message to error log
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</td></tr>
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<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LogMessage <var>message</var>
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[hook=<var>hook</var>] [expr=<var>expression</var>]
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</code></td></tr>
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<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>Unset</code></td></tr>
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<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>directory</td></tr>
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<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
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<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_log_debug</td></tr>
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</table>
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<p>This directive causes a user defined message to be logged to the
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error log. The message can use variables and functions from the
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<a href="../expr.html">ap_expr syntax</a>. References to HTTP headers
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will not cause header names to be added to the Vary header. The
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messages are logged at loglevel info.</p>
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<p>The hook specifies before which phase of request processing the message
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will be logged. The following hooks are supported:</p>
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<table class="bordered"><tr class="header"><th>Name</th></tr>
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<tr><td><code>translate_name</code></td></tr>
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<tr class="odd"><td><code>type_checker</code></td></tr>
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<tr><td><code>quick_handler</code></td></tr>
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<tr class="odd"><td><code>map_to_storage</code></td></tr>
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<tr><td><code>check_access</code></td></tr>
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<tr class="odd"><td><code>check_access_ex</code></td></tr>
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<tr><td><code>insert_filter</code></td></tr>
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<tr class="odd"><td><code>check_authn</code></td></tr>
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<tr><td><code>check_authz</code></td></tr>
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<tr class="odd"><td><code>fixups</code></td></tr>
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<tr><td><code>handler</code></td></tr>
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<tr class="odd"><td><code>log_transaction</code></td></tr>
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</table>
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<p>The default is <code>log_transaction</code>. The special value
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<code>all</code> is also supported, causing a message to be logged at each
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phase. Not all hooks are executed for every request.</p>
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<p>The optional expression allows to restrict the message if a
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condition is met. The details of the expression syntax are described in
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the <a href="../expr.html">ap_expr documentation</a>. References to HTTP
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headers will not cause the header names to be added to the Vary header.</p>
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</div>
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</div>
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<div class="bottomlang">
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<p><span>Available Languages: </span><a href="../en/mod/mod_log_debug.html" title="English"> en </a> |
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<a href="../fr/mod/mod_log_debug.html" hreflang="fr" rel="alternate" title="Fran<61>ais"> fr </a></p>
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</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&A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed again 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 Freenode, or sent to our <a href="http://httpd.apache.org/lists.html">mailing lists</a>.</div>
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<p class="apache">Copyright 2017 The Apache Software Foundation.<br />Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p>
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<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/quickreference.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p></div><script type="text/javascript"><!--//--><![CDATA[//><!--
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