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   8 <title>mod_log_debug - Apache HTTP Server</title>
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  23 <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>
  24 <div id="page-content">
  25 <div id="preamble"><h1>Apache Module mod_log_debug</h1>
  26 <div class="toplang">
  27 <p><span>Available Languages: </span><a href="../en/mod/mod_log_debug.html" title="English">&nbsp;en&nbsp;</a></p>
  28 </div>
  29 <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Additional configurable debug logging</td></tr>
  30 <tr><th><a href="module-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
  31 <tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>log_debug_module</td></tr>
  32 <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_log_debug.c</td></tr>
  33 <tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.3.14 and later</td></tr></table>
  34 </div>
  35 <div id="quickview"><h3 class="directives">Directives</h3>
  36 <ul id="toc">
  37 <li><img alt="" src="../images/down.gif" /> <a href="#logmessage">LogMessage</a></li>
  38 </ul>
  39 <h3>Topics</h3>
  40 <ul id="topics">
  41 <li><img alt="" src="../images/down.gif" /> <a href="#examples">Examples</a></li>
  42 </ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
  43 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
  44 <div class="section">
  45 <h2><a name="examples" id="examples">Examples</a></h2>
  46
  47     <ol>
  48       <li>
  49         Log message after request to /foo/* is processed:
  50
  51         <pre class="prettyprint lang-config">
  52 &lt;Location /foo/&gt;
  53 &nbsp;&nbsp;LogMessage "/foo/ has been requested"
  54 &lt;/Location&gt;
  55         </pre>
  56
  57       </li>
  58
  59       <li>
  60         Log message if request to /foo/* is processed in a sub-request:
  61         <pre class="prettyprint lang-config">
  62 &lt;Location /foo/&gt;
  63 &nbsp;&nbsp;LogMessage "subrequest to /foo/" hook=type_checker expr=%{IS_SUBREQ}
  64 &lt;/Location&gt;
  65         </pre>
  66
  67
  68         The default log_transaction hook is not executed for sub-requests,
  69         therefore we have to use a different hook.
  70       </li>
  71
  72
  73       <li>
  74         Log message if an IPv6 client causes a request timeout:
  75         <pre class="prettyprint lang-config">
  76             LogMessage "IPv6 timeout from %{REMOTE_ADDR}" "expr=-T %{IPV6} &amp;&amp; %{REQUEST_STATUS} = 408"
  77         </pre>
  78
  79         Note the placing of the double quotes for the <code>expr=</code> argument.
  80       </li>
  81
  82       <li>
  83         Log the value of the "X-Foo" request environment variable in each
  84         stage of the request:
  85         <pre class="prettyprint lang-config">
  86 &lt;Location /&gt;
  87 &nbsp;&nbsp;LogMessage "%{reqenv:X-Foo}" hook=all
  88 &lt;/Location&gt;
  89         </pre>
  90
  91         Together with microsecond time stamps in the error log,
  92         <code>hook=all</code> also allows to determine the times spent
  93         in the different parts of the request processing.
  94       </li>
  95
  96     </ol>
  97 </div>
  98 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
  99 <div class="directive-section"><h2><a name="LogMessage" id="LogMessage">LogMessage</a> <a name="logmessage" id="logmessage">Directive</a></h2>
 100 <table class="directive">
 101 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Log userdefined message to error log
 102 </td></tr>
 103 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LogMessage <var>message</var>
 104 [hook=<var>hook</var>] [expr=<var>expression</var>]
 105 </code></td></tr>
 106 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>Unset</code></td></tr>
 107 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>directory</td></tr>
 108 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
 109 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_log_debug</td></tr>
 110 </table>
 111     <p>This directive causes a user defined message to be logged to the
 112     error log. The message can use variables and functions from the
 113     <a href="../expr.html">ap_expr syntax</a>. The messages are logged at
 114     loglevel info.</p>
 115
 116     <p>The hook specifies before which phase of request procesing the message
 117     will be logged. The following hooks are supported:</p>
 118
 119     <table class="bordered"><tr class="header"><th>Name</th></tr>
 120 <tr><td><code>translate_name</code></td></tr>
 121 <tr class="odd"><td><code>type_checker</code></td></tr>
 122 <tr><td><code>quick_handler</code></td></tr>
 123 <tr class="odd"><td><code>map_to_storage</code></td></tr>
 124 <tr><td><code>check_access</code></td></tr>
 125 <tr class="odd"><td><code>check_access_ex</code></td></tr>
 126 <tr><td><code>insert_filter</code></td></tr>
 127 <tr class="odd"><td><code>check_authn</code></td></tr>
 128 <tr><td><code>check_authz</code></td></tr>
 129 <tr class="odd"><td><code>fixups</code></td></tr>
 130 <tr><td><code>handler</code></td></tr>
 131 <tr class="odd"><td><code>log_transaction</code></td></tr>
 132 </table>
 133
 134     <p>The default is <code>log_transaction</code>. The special value
 135     <code>all</code> is also supported, causing a message to be logged at each
 136     phase. Not all hooks are executed for every request.</p>
 137
 138     <p>The optional expression allows to restrict the message if a
 139     condition is met. The details of the expression syntax are described in
 140     the <a href="../expr.html">ap_expr documentation</a>.</p>
 141
 142
 143 </div>
 144 </div>
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 146 <p><span>Available Languages: </span><a href="../en/mod/mod_log_debug.html" title="English">&nbsp;en&nbsp;</a></p>
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