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<?xml version="1.0" encoding="ISO-8859-1"?>
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<title>mod_log_debug - Apache HTTP Server</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>
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<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"> en </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"><h3 class="directives">Directives</h3>
<ul id="toc">
<li><img alt="" src="../images/down.gif" /> <a href="#logmessage">LogMessage</a></li>
</ul>
<h3>Topics</h3>
<ul id="topics">
<li><img alt="" src="../images/down.gif" /> <a href="#examples">Examples</a></li>
</ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
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<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">
<Location /foo/>
LogMessage "/foo/ has been requested"
</Location>
</pre>
</li>
<li>
Log message if request to /foo/* is processed in a sub-request:
<pre class="prettyprint lang-config">
<Location /foo/>
LogMessage "subrequest to /foo/" hook=type_checker expr=%{IS_SUBREQ}
</Location>
</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} && %{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">
<Location />
LogMessage "%{reqenv:X-Foo}" hook=all
</Location>
</pre>
Together with microsecond time stamps in the error log,
<code>hook=all</code> also allows to 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 userdefined 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>. The messages are logged at
loglevel info.</p>
<p>The hook specifies before which phase of request procesing the message
will be logged. The following hooks are supported:</p>
<table class="bordered"><tr class="header"><th>Name</th></tr>
<tr><td><code>translate_name</code></td></tr>
<tr class="odd"><td><code>type_checker</code></td></tr>
<tr><td><code>quick_handler</code></td></tr>
<tr class="odd"><td><code>map_to_storage</code></td></tr>
<tr><td><code>check_access</code></td></tr>
<tr class="odd"><td><code>check_access_ex</code></td></tr>
<tr><td><code>insert_filter</code></td></tr>
<tr class="odd"><td><code>check_authn</code></td></tr>
<tr><td><code>check_authz</code></td></tr>
<tr class="odd"><td><code>fixups</code></td></tr>
<tr><td><code>handler</code></td></tr>
<tr class="odd"><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>.</p>
</div>
</div>
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<p><span>Available Languages: </span><a href="../en/mod/mod_log_debug.html" title="English"> en </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&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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