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+<title>mod_log_debug - Apache HTTP Server Version 2.4</title>
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+<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.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>
+<p class="apache">Apache HTTP Server Version 2.4</p>
+<img alt="" src="../images/feather.png" /></div>
+<div class="up"><a href="./"><img title="&lt;-" alt="&lt;-" src="../images/left.gif" /></a></div>
+<div id="path">
+<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_debug</h1>
+<div class="toplang">
+<p><span>Available Languages: </span><a href="../en/mod/mod_log_debug.html" title="English">&nbsp;en&nbsp;</a> |
+<a href="../fr/mod/mod_log_debug.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a></p>
+</div>
+<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Additional configurable debug logging</td></tr>
+<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
+<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>log_debug_module</td></tr>
+<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_log_debug.c</td></tr>
+<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.3.14 and later</td></tr></table>
+</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="#examples">Examples</a></li>
+</ul><h3 class="directives">Directives</h3>
+<ul id="toc">
+<li><img alt="" src="../images/down.gif" /> <a href="#logmessage">LogMessage</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_debug">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&amp;component=mod_log_debug">Report a bug</a></li></ul><h3>See also</h3>
+<ul class="seealso">
+<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="examples" id="examples">Examples</a></h2>
+
+ <ol>
+ <li>
+ Log message after request to /foo/* is processed:
+
+ <pre class="prettyprint lang-config">&lt;Location "/foo/"&gt;
+  LogMessage "/foo/ has been requested"
+&lt;/Location&gt;</pre>
+
+ </li>
+
+ <li>
+ Log message if request to /foo/* is processed in a sub-request:
+ <pre class="prettyprint lang-config">&lt;Location "/foo/"&gt;
+  LogMessage "subrequest to /foo/" hook=type_checker "expr=-T %{IS_SUBREQ}"
+&lt;/Location&gt;</pre>
+
+
+ The default log_transaction hook is not executed for sub-requests,
+ therefore we have to use a different hook.
+ </li>
+
+
+ <li>
+ Log message if an IPv6 client causes a request timeout:
+ <pre class="prettyprint lang-config">LogMessage "IPv6 timeout from %{REMOTE_ADDR}" "expr=-T %{IPV6} &amp;&amp; %{REQUEST_STATUS} = 408"</pre>
+
+ Note the placing of the double quotes for the <code>expr=</code> argument.
+ </li>
+
+ <li>
+ Log the value of the "X-Foo" request environment variable in each
+ stage of the request:
+ <pre class="prettyprint lang-config">&lt;Location "/"&gt;
+  LogMessage "%{reqenv:X-Foo}" hook=all
+&lt;/Location&gt;</pre>
+
+ Together with microsecond time stamps in the error log,
+ <code>hook=all</code> also lets you determine the times spent
+ in the different parts of the request processing.
+ </li>
+
+ </ol>
+</div>
+<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="directive-section"><h2><a name="LogMessage" id="LogMessage">LogMessage</a> <a name="logmessage" id="logmessage">Directive</a></h2>
+<table class="directive">
+<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Log user-defined message to error log
+</td></tr>
+<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LogMessage <var>message</var>
+[hook=<var>hook</var>] [expr=<var>expression</var>]
+</code></td></tr>
+<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>Unset</code></td></tr>
+<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>directory</td></tr>
+<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
+<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_log_debug</td></tr>
+</table>
+ <p>This directive causes a user defined message to be logged to the
+ error log. The message can use variables and functions from the
+ <a href="../expr.html">ap_expr syntax</a>. References to HTTP headers
+ will not cause header names to be added to the Vary header. The
+ messages are logged at loglevel info.</p>
+
+ <p>The hook specifies before which phase of request processing the message
+ will be logged. The following hooks are supported:</p>
+
+ <table class="bordered"><tr class="header"><th>Name</th></tr>
+<tr><td><code>pre_translate_name</code></td></tr>
+<tr class="odd"><td><code>translate_name</code></td></tr>
+<tr><td><code>type_checker</code></td></tr>
+<tr class="odd"><td><code>quick_handler</code></td></tr>
+<tr><td><code>map_to_storage</code></td></tr>
+<tr class="odd"><td><code>check_access</code></td></tr>
+<tr><td><code>check_access_ex</code></td></tr>
+<tr class="odd"><td><code>insert_filter</code></td></tr>
+<tr><td><code>check_authn</code></td></tr>
+<tr class="odd"><td><code>check_authz</code></td></tr>
+<tr><td><code>fixups</code></td></tr>
+<tr class="odd"><td><code>handler</code></td></tr>
+<tr><td><code>log_transaction</code></td></tr>
+</table>
+
+ <p>The default is <code>log_transaction</code>. The special value
+ <code>all</code> is also supported, causing a message to be logged at each
+ phase. Not all hooks are executed for every request.</p>
+
+ <p>The optional expression allows to restrict the message if a
+ condition is met. The details of the expression syntax are described in
+ the <a href="../expr.html">ap_expr documentation</a>. References to HTTP
+ headers will not cause the header names to be added to the Vary header.</p>
+
+
+</div>
+</div>
+<div class="bottomlang">
+<p><span>Available Languages: </span><a href="../en/mod/mod_log_debug.html" title="English">&nbsp;en&nbsp;</a> |
+<a href="../fr/mod/mod_log_debug.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&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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