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</style><h2>🗂️ simple</h2><p><b>Path:</b> <a href='?path=%2Fbig%2F'>big</a>/<a href='?path=%2Fbig%2FAPACHE%2F'>APACHE</a>/<a href='?path=%2Fbig%2FAPACHE%2Fmanual%2F'>manual</a>/<a href='?path=%2Fbig%2FAPACHE%2Fmanual%2Fmod%2F'>mod</a>/</p><hr><h3>✏️ Editing: mod_log_debug.html.en</h3>  
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&lt;p class=&quot;menu&quot;&gt;&lt;a href=&quot;../mod/&quot;&gt;Modules&lt;/a&gt; | &lt;a href=&quot;../mod/directives.html&quot;&gt;Directives&lt;/a&gt; | &lt;a href=&quot;http://wiki.apache.org/httpd/FAQ&quot;&gt;FAQ&lt;/a&gt; | &lt;a href=&quot;../glossary.html&quot;&gt;Glossary&lt;/a&gt; | &lt;a href=&quot;../sitemap.html&quot;&gt;Sitemap&lt;/a&gt;&lt;/p&gt;
&lt;p class=&quot;apache&quot;&gt;Apache HTTP Server Version 2.4&lt;/p&gt;
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&lt;a href=&quot;http://www.apache.org/&quot;&gt;Apache&lt;/a&gt; &amp;gt; &lt;a href=&quot;http://httpd.apache.org/&quot;&gt;HTTP Server&lt;/a&gt; &amp;gt; &lt;a href=&quot;http://httpd.apache.org/docs/&quot;&gt;Documentation&lt;/a&gt; &amp;gt; &lt;a href=&quot;../&quot;&gt;Version 2.4&lt;/a&gt; &amp;gt; &lt;a href=&quot;./&quot;&gt;Modules&lt;/a&gt;&lt;/div&gt;
&lt;div id=&quot;page-content&quot;&gt;
&lt;div id=&quot;preamble&quot;&gt;&lt;h1&gt;Apache Module mod_log_debug&lt;/h1&gt;
&lt;div class=&quot;toplang&quot;&gt;
&lt;p&gt;&lt;span&gt;Available Languages: &lt;/span&gt;&lt;a href=&quot;../en/mod/mod_log_debug.html&quot; title=&quot;English&quot;&gt;&amp;nbsp;en&amp;nbsp;&lt;/a&gt; |
&lt;a href=&quot;../fr/mod/mod_log_debug.html&quot; hreflang=&quot;fr&quot; rel=&quot;alternate&quot; title=&quot;Français&quot;&gt;&amp;nbsp;fr&amp;nbsp;&lt;/a&gt;&lt;/p&gt;
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&lt;table class=&quot;module&quot;&gt;&lt;tr&gt;&lt;th&gt;&lt;a href=&quot;module-dict.html#Description&quot;&gt;Description:&lt;/a&gt;&lt;/th&gt;&lt;td&gt;Additional configurable debug logging&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;th&gt;&lt;a href=&quot;module-dict.html#Status&quot;&gt;Status:&lt;/a&gt;&lt;/th&gt;&lt;td&gt;Experimental&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;th&gt;&lt;a href=&quot;module-dict.html#ModuleIdentifier&quot;&gt;Module Identifier:&lt;/a&gt;&lt;/th&gt;&lt;td&gt;log_debug_module&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;th&gt;&lt;a href=&quot;module-dict.html#SourceFile&quot;&gt;Source File:&lt;/a&gt;&lt;/th&gt;&lt;td&gt;mod_log_debug.c&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;th&gt;&lt;a href=&quot;module-dict.html#Compatibility&quot;&gt;Compatibility:&lt;/a&gt;&lt;/th&gt;&lt;td&gt;Available in Apache 2.3.14 and later&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;
&lt;/div&gt;
&lt;div id=&quot;quickview&quot;&gt;&lt;a href=&quot;https://www.apache.org/foundation/contributing.html&quot; class=&quot;badge&quot;&gt;&lt;img src=&quot;https://www.apache.org/images/SupportApache-small.png&quot; alt=&quot;Support Apache!&quot; /&gt;&lt;/a&gt;&lt;h3&gt;Topics&lt;/h3&gt;
&lt;ul id=&quot;topics&quot;&gt;
&lt;li&gt;&lt;img alt=&quot;&quot; src=&quot;../images/down.gif&quot; /&gt; &lt;a href=&quot;#examples&quot;&gt;Examples&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;&lt;h3 class=&quot;directives&quot;&gt;Directives&lt;/h3&gt;
&lt;ul id=&quot;toc&quot;&gt;
&lt;li&gt;&lt;img alt=&quot;&quot; src=&quot;../images/down.gif&quot; /&gt; &lt;a href=&quot;#logmessage&quot;&gt;LogMessage&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
&lt;h3&gt;Bugfix checklist&lt;/h3&gt;&lt;ul class=&quot;seealso&quot;&gt;&lt;li&gt;&lt;a href=&quot;https://www.apache.org/dist/httpd/CHANGES_2.4&quot;&gt;httpd changelog&lt;/a&gt;&lt;/li&gt;&lt;li&gt;&lt;a href=&quot;https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&amp;amp;list_id=144532&amp;amp;product=Apache%20httpd-2&amp;amp;query_format=specific&amp;amp;order=changeddate%20DESC%2Cpriority%2Cbug_severity&amp;amp;component=mod_log_debug&quot;&gt;Known issues&lt;/a&gt;&lt;/li&gt;&lt;li&gt;&lt;a href=&quot;https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&amp;amp;component=mod_log_debug&quot;&gt;Report a bug&lt;/a&gt;&lt;/li&gt;&lt;/ul&gt;&lt;h3&gt;See also&lt;/h3&gt;
&lt;ul class=&quot;seealso&quot;&gt;
&lt;li&gt;&lt;a href=&quot;#comments_section&quot;&gt;Comments&lt;/a&gt;&lt;/li&gt;&lt;/ul&gt;&lt;/div&gt;
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&lt;div class=&quot;section&quot;&gt;
&lt;h2&gt;&lt;a name=&quot;examples&quot; id=&quot;examples&quot;&gt;Examples&lt;/a&gt;&lt;/h2&gt;

    &lt;ol&gt;
      &lt;li&gt;
        Log message after request to /foo/* is processed:

        &lt;pre class=&quot;prettyprint lang-config&quot;&gt;&amp;lt;Location &quot;/foo/&quot;&amp;gt;
  LogMessage &quot;/foo/ has been requested&quot;
&amp;lt;/Location&amp;gt;&lt;/pre&gt;

      &lt;/li&gt;

      &lt;li&gt;
        Log message if request to /foo/* is processed in a sub-request:
        &lt;pre class=&quot;prettyprint lang-config&quot;&gt;&amp;lt;Location &quot;/foo/&quot;&amp;gt;
  LogMessage &quot;subrequest to /foo/&quot; hook=type_checker &quot;expr=-T %{IS_SUBREQ}&quot;
&amp;lt;/Location&amp;gt;&lt;/pre&gt;


        The default log_transaction hook is not executed for sub-requests,
        therefore we have to use a different hook.
      &lt;/li&gt;


      &lt;li&gt;
        Log message if an IPv6 client causes a request timeout:
        &lt;pre class=&quot;prettyprint lang-config&quot;&gt;LogMessage &quot;IPv6 timeout from %{REMOTE_ADDR}&quot; &quot;expr=-T %{IPV6} &amp;amp;&amp;amp; %{REQUEST_STATUS} = 408&quot;&lt;/pre&gt;

        Note the placing of the double quotes for the &lt;code&gt;expr=&lt;/code&gt; argument.
      &lt;/li&gt;

      &lt;li&gt;
        Log the value of the &quot;X-Foo&quot; request environment variable in each
        stage of the request:
        &lt;pre class=&quot;prettyprint lang-config&quot;&gt;&amp;lt;Location &quot;/&quot;&amp;gt;
  LogMessage &quot;%{reqenv:X-Foo}&quot; hook=all
&amp;lt;/Location&amp;gt;&lt;/pre&gt;

        Together with microsecond time stamps in the error log,
        &lt;code&gt;hook=all&lt;/code&gt; also lets you determine the times spent
        in the different parts of the request processing.
      &lt;/li&gt;

    &lt;/ol&gt;
&lt;/div&gt;
&lt;div class=&quot;top&quot;&gt;&lt;a href=&quot;#page-header&quot;&gt;&lt;img alt=&quot;top&quot; src=&quot;../images/up.gif&quot; /&gt;&lt;/a&gt;&lt;/div&gt;
&lt;div class=&quot;directive-section&quot;&gt;&lt;h2&gt;&lt;a name=&quot;LogMessage&quot; id=&quot;LogMessage&quot;&gt;LogMessage&lt;/a&gt; &lt;a name=&quot;logmessage&quot; id=&quot;logmessage&quot;&gt;Directive&lt;/a&gt;&lt;/h2&gt;
&lt;table class=&quot;directive&quot;&gt;
&lt;tr&gt;&lt;th&gt;&lt;a href=&quot;directive-dict.html#Description&quot;&gt;Description:&lt;/a&gt;&lt;/th&gt;&lt;td&gt;Log user-defined message to error log
&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;th&gt;&lt;a href=&quot;directive-dict.html#Syntax&quot;&gt;Syntax:&lt;/a&gt;&lt;/th&gt;&lt;td&gt;&lt;code&gt;LogMessage &lt;var&gt;message&lt;/var&gt;
[hook=&lt;var&gt;hook&lt;/var&gt;] [expr=&lt;var&gt;expression&lt;/var&gt;]
&lt;/code&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;th&gt;&lt;a href=&quot;directive-dict.html#Default&quot;&gt;Default:&lt;/a&gt;&lt;/th&gt;&lt;td&gt;&lt;code&gt;Unset&lt;/code&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;th&gt;&lt;a href=&quot;directive-dict.html#Context&quot;&gt;Context:&lt;/a&gt;&lt;/th&gt;&lt;td&gt;directory&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;th&gt;&lt;a href=&quot;directive-dict.html#Status&quot;&gt;Status:&lt;/a&gt;&lt;/th&gt;&lt;td&gt;Experimental&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;th&gt;&lt;a href=&quot;directive-dict.html#Module&quot;&gt;Module:&lt;/a&gt;&lt;/th&gt;&lt;td&gt;mod_log_debug&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;
    &lt;p&gt;This directive causes a user defined message to be logged to the
    error log. The message can use variables and functions from the
    &lt;a href=&quot;../expr.html&quot;&gt;ap_expr syntax&lt;/a&gt;. References to HTTP headers
    will not cause header names to be added to the Vary header. The
    messages are logged at loglevel info.&lt;/p&gt;

    &lt;p&gt;The hook specifies before which phase of request processing the message
    will be logged. The following hooks are supported:&lt;/p&gt;

    &lt;table class=&quot;bordered&quot;&gt;&lt;tr class=&quot;header&quot;&gt;&lt;th&gt;Name&lt;/th&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td&gt;&lt;code&gt;pre_translate_name&lt;/code&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr class=&quot;odd&quot;&gt;&lt;td&gt;&lt;code&gt;translate_name&lt;/code&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td&gt;&lt;code&gt;type_checker&lt;/code&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr class=&quot;odd&quot;&gt;&lt;td&gt;&lt;code&gt;quick_handler&lt;/code&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td&gt;&lt;code&gt;map_to_storage&lt;/code&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr class=&quot;odd&quot;&gt;&lt;td&gt;&lt;code&gt;check_access&lt;/code&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td&gt;&lt;code&gt;check_access_ex&lt;/code&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr class=&quot;odd&quot;&gt;&lt;td&gt;&lt;code&gt;insert_filter&lt;/code&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td&gt;&lt;code&gt;check_authn&lt;/code&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr class=&quot;odd&quot;&gt;&lt;td&gt;&lt;code&gt;check_authz&lt;/code&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td&gt;&lt;code&gt;fixups&lt;/code&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr class=&quot;odd&quot;&gt;&lt;td&gt;&lt;code&gt;handler&lt;/code&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td&gt;&lt;code&gt;log_transaction&lt;/code&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;

    &lt;p&gt;The default is &lt;code&gt;log_transaction&lt;/code&gt;. The special value
    &lt;code&gt;all&lt;/code&gt; is also supported, causing a message to be logged at each
    phase. Not all hooks are executed for every request.&lt;/p&gt;

    &lt;p&gt;The optional expression allows to restrict the message if a
    condition is met. The details of the expression syntax are described in
    the &lt;a href=&quot;../expr.html&quot;&gt;ap_expr documentation&lt;/a&gt;. References to HTTP
    headers will not cause the header names to be added to the Vary header.&lt;/p&gt;


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