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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>
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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>
<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#Compatibility">Compatibility:</a></th><td>Available in Apache 2.3.14 and later</td></tr></table>
</div>
<div id="quickview"><h3>Topics</h3>
<ul id="topics">
</ul><h3 class="directives">Directives</h3>
<ul id="toc">
</ul>
<ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></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"><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 lets you determine the times spent
in the different parts of the request processing.
</li>
</ol>
</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>
</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
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>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
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"> en </a></p>
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