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| <title>mod_log_debug - Apache HTTP Server</title> |
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| <p class="apache">Apache HTTP Server Version 2.3</p> |
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| <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"> 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></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: |
| |
| <div class="example"><p><code> |
| <Location /foo/><br /> |
| LogMessage "/foo/ has been requested"<br /> |
| </Location><br /> |
| </code></p></div> |
| </li> |
| |
| <li> |
| Log message if request to /foo/* is processed in a sub-request: |
| <div class="example"><p><code> |
| <Location /foo/><br /> |
| LogMessage "subrequest to /foo/" hook=type_checker expr=%{IS_SUBREQ}<br /> |
| </Location><br /> |
| </code></p></div> |
| |
| 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: |
| <div class="example"><p><code> |
| LogMessage "IPv6 timeout from %{REMOTE_ADDR}" |
| "expr=-T %{IPV6} && %{REQUEST_STATUS} = 408" |
| </code></p></div> |
| 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: |
| <div class="example"><p><code> |
| <Location /><br /> |
| LogMessage "%{reqenv:X-Foo}" hook=all<br /> |
| </Location><br /> |
| </code></p></div> |
| 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> |
| <div class="bottomlang"> |
| <p><span>Available Languages: </span><a href="../en/mod/mod_log_debug.html" title="English"> en </a></p> |
| </div><div id="footer"> |
| <p class="apache">Copyright 2011 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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