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   8 <title>Overview of new features in Apache 2.4 - Apache HTTP Server</title>
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  13 <body id="manual-page"><div id="page-header">
  14 <p class="menu"><a href="./mod/">Modules</a> | <a href="./mod/directives.html">Directives</a> | <a href="./faq/">FAQ</a> | <a href="./glossary.html">Glossary</a> | <a href="./sitemap.html">Sitemap</a></p>
  15 <p class="apache">Apache HTTP Server Version 2.3</p>
  16 <img alt="" src="./images/feather.gif" /></div>
  17 <div class="up"><a href="./"><img title="&lt;-" alt="&lt;-" src="./images/left.gif" /></a></div>
  18 <div id="path">
  19 <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>
  20 <div class="toplang">
  21 <p><span>Available Languages: </span><a href="./en/new_features_2_4.html" title="English">&nbsp;en&nbsp;</a></p>
  22 </div>
  23
  24   <p>This document describes some of the major changes between the
  25      2.2 and 2.4 versions of the Apache HTTP Server. For new features since
  26      version 2.0, see the <a href="new_features_2_2.html">2.2 new features</a>
  27      document.</p>
  28 </div>
  29 <div id="quickview"><ul id="toc"><li><img alt="" src="./images/down.gif" /> <a href="#core">Core Enhancements</a></li>
  30 <li><img alt="" src="./images/down.gif" /> <a href="#module">Module Enhancements</a></li>
  31 <li><img alt="" src="./images/down.gif" /> <a href="#programs">Program Enhancements</a></li>
  32 <li><img alt="" src="./images/down.gif" /> <a href="#developer">Module Developer Changes</a></li>
  33 </ul></div>
  34 <div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
  35 <div class="section">
  36 <h2><a name="core" id="core">Core Enhancements</a></h2>
  37
  38
  39   </div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
  40 <div class="section">
  41 <h2><a name="module" id="module">Module Enhancements</a></h2>
  42
  43
  44   </div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
  45 <div class="section">
  46 <h2><a name="programs" id="programs">Program Enhancements</a></h2>
  47
  48
  49   </div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
  50 <div class="section">
  51 <h2><a name="developer" id="developer">Module Developer Changes</a></h2>
  52
  53     <dl>
  54       <dt>Check Configuration Hook Added</dt>
  55
  56       <dd>A new hook, <code>check_config</code>, has been added which runs
  57           between the <code>pre_config</code> and <code>open_logs</code>
  58           hooks.  It also runs before the <code>test_config</code> hook
  59           when the <code>-t</code> option is passed to
  60           <code class="program"><a href="./programs/httpd.html">httpd</a></code>.  The <code>check_config</code> hook
  61           allows modules to review interdependent configuration directive
  62           values and adjust them while messages can still be logged to the
  63           console.  The user can thus be alerted to misconfiguration problems
  64           before the core <code>open_logs</code> hook function redirects
  65           console output to the error log.</dd>
  66     <dt>Expression Parser Added</dt>
  67     <dd>We now have a general-purpose expression parser, whose API is
  68         exposed in <var>ap_expr.h</var>.  This is adapted from the
  69         expression parser previously implemented in
  70         <code class="module"><a href="./mod/mod_include.html">mod_include</a></code>.</dd>
  71     </dl>
  72   </div></div>
  73 <div class="bottomlang">
  74 <p><span>Available Languages: </span><a href="./en/new_features_2_4.html" title="English">&nbsp;en&nbsp;</a></p>
  75 </div><div id="footer">
  76 <p class="apache">Copyright 2008 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>
  77 <p class="menu"><a href="./mod/">Modules</a> | <a href="./mod/directives.html">Directives</a> | <a href="./faq/">FAQ</a> | <a href="./glossary.html">Glossary</a> | <a href="./sitemap.html">Sitemap</a></p></div>
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