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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> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <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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<a href="/fr/new_features_2_4.html" hreflang="fr" rel="alternate" title="Fran�ais"> fr </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
document.</p>
</div>
<div id="quickview"><ul id="toc"><li><img alt="" src="/images/down.gif" /> <a href="#core">Core Enhancements</a></li>
</ul></div>
<div class="section">
<h2><a name="core" id="core">Core Enhancements</a></h2>
<dl>
<dt>KeepAliveTimeout in milliseconds</dt>
<dd>It is now possible to specify <code class="directive"><a href="/mod/core.html#keepalivetimeout">KeepAliveTimeout</a></code> in milliseconds.
</dd>
</dl>
<div class="section">
<h2><a name="module" id="module">Module Enhancements</a></h2>
<dl>
<dt><code class="module"><a href="/mod/mod_ssl.html">mod_ssl</a></code>: Support for OCSP validation of client certificates</dt>
<dd><code class="module"><a href="/mod/mod_ssl.html">mod_ssl</a></code> can now be configured to use an
OCSP server to check the validation status of a client
certificate. The default responder is configurable, along with
the decision on whether to prefer the responder designated in
the client certificate itself.</dd>
</dl>
<div class="section">
<h2><a name="programs" id="programs">Program Enhancements</a></h2>
<div class="section">
<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>
<dt>Expression Parser Added</dt>
<dd>We now have a general-purpose expression parser, whose API is
expression parser previously implemented in
<dt>Authorization Logic Containers</dt>
<dd>Advanced authorization logic may now be specified using the
and the related container directives, such as
<code class="directive"><a href="/mod/mod_authz_core.html#requireall"><RequireAll></a></code>, all
provided by the <code class="module"><a href="/mod/mod_authz_core.html">mod_authz_core</a></code> module.</dd>
<dt>Small-Object Caching Interface</dt>
interface for caching small data objects, based on the previous
implementation of the <code class="module"><a href="/mod/mod_ssl.html">mod_ssl</a></code> session cache.
Providers using a shared-memory cyclic buffer, disk-based dbm
files, and a memcache distributed cache are currently
supported.</dd>
</dl>
</div></div>
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<p class="apache">Copyright 2009 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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