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<title>Overview of new features in Apache 2.4 - Apache HTTP Server</title>
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<p class="apache">Apache HTTP Server Version 2.3</p>
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<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 2.3</a></div><div id="page-content"><div id="preamble"><h1>Overview of new features in Apache 2.4</h1>
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<p><span>Available Languages: </span><a href="/en/new_features_2_4.html" title="English">&nbsp;en&nbsp;</a></p>
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<p>This document describes some of the major changes between the
2.2 and 2.4 versions of the Apache HTTP Server. For new features since
version 2.0, see the <a href="new_features_2_2.html">2.2 new features</a>
document.</p>
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<div id="quickview"><ul id="toc"><li><img alt="" src="/images/down.gif" /> <a href="#core">Core Enhancements</a></li>
<li><img alt="" src="/images/down.gif" /> <a href="#module">Module Enhancements</a></li>
<li><img alt="" src="/images/down.gif" /> <a href="#programs">Program Enhancements</a></li>
<li><img alt="" src="/images/down.gif" /> <a href="#developer">Module Developer Changes</a></li>
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<h2><a name="core" id="core">Core Enhancements</a></h2>
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<h2><a name="module" id="module">Module Enhancements</a></h2>
<dl>
<dt><code class="module"><a href="/mod/mod_headers.html">mod_headers</a></code></dt>
<dd>Using the new <code>edit</code> argument, header values may
be edited using a regular expression search-and-replace
operation.</dd>
</dl>
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<h2><a name="programs" id="programs">Program Enhancements</a></h2>
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<h2><a name="developer" id="developer">Module Developer Changes</a></h2>
<dl>
<dt>Check Configuration Hook Added</dt>
<dd>A new hook, <code>check_config</code>, has been added which runs
between the <code>pre_config</code> and <code>open_logs</code>
hooks. It also runs before the <code>test_config</code> hook
when the <code>-t</code> option is passed to
<code class="program"><a href="/programs/httpd.html">httpd</a></code>. The <code>check_config</code> hook
allows modules to review interdependent configuration directive
values and adjust them while messages can still be logged to the
console. The user can thus be alerted to misconfiguration problems
before the core <code>open_logs</code> hook function redirects
console output to the error log.</dd>
</dl>
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<p class="apache">Copyright 2006 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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