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198 lines
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198 lines
11 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><!--
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XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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This file is generated from xml source: DO NOT EDIT
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XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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-->
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<title>Overview of new features in Apache HTTP Server 2.4 - Apache HTTP Server</title>
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<link href="./style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" />
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<link href="./style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" />
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<link href="./style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" />
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<link href="./images/favicon.ico" rel="shortcut icon" /></head>
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<body id="manual-page"><div id="page-header">
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<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>
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<p class="apache">Apache HTTP Server Version 2.3</p>
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<img alt="" src="./images/feather.gif" /></div>
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<div class="up"><a href="./"><img title="<-" alt="<-" src="./images/left.gif" /></a></div>
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<div id="path">
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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 HTTP Server 2.4</h1>
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<div class="toplang">
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<p><span>Available Languages: </span><a href="./en/new_features_2_4.html" title="English"> en </a> |
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<a href="./fr/new_features_2_4.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p>
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</div>
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<p>This document describes some of the major changes between the
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2.2 and 2.4 versions of the Apache HTTP Server. For new features since
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version 2.0, see the <a href="new_features_2_2.html">2.2 new features</a>
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document.</p>
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</div>
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<div id="quickview"><ul id="toc"><li><img alt="" src="./images/down.gif" /> <a href="#core">Core Enhancements</a></li>
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<li><img alt="" src="./images/down.gif" /> <a href="#module">Module Enhancements</a></li>
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<li><img alt="" src="./images/down.gif" /> <a href="#programs">Program Enhancements</a></li>
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<li><img alt="" src="./images/down.gif" /> <a href="#developer">Module Developer Changes</a></li>
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</ul></div>
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<div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="core" id="core">Core Enhancements</a></h2>
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<dl>
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<dt>KeepAliveTimeout in milliseconds</dt>
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<dd>It is now possible to specify <code class="directive"><a href="./mod/core.html#keepalivetimeout">KeepAliveTimeout</a></code> in milliseconds.
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</dd>
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<dt>Loadable MPMs</dt>
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<dd>Multiple MPMs can now be built as loadable modules at compile time.
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The MPM of choice can be configured at run time.</dd>
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<dt>Per-module and per-directory LogLevel configuration</dt>
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<dd>The <code class="directive"><a href="./mod/core.html#loglevel">LogLevel</a></code> can now be
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configured per module and per directory. New levels <code>trace1</code>
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to <code>trace8</code> have been added above the <code>debug</code> log
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level.</dd>
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</dl>
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</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="module" id="module">Module Enhancements</a></h2>
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<dl>
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<dt><code class="module"><a href="./mod/mod_ssl.html">mod_ssl</a></code></dt>
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<dd><code class="module"><a href="./mod/mod_ssl.html">mod_ssl</a></code> can now be configured to use an
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OCSP server to check the validation status of a client
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certificate. The default responder is configurable, along with
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the decision on whether to prefer the responder designated in
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the client certificate itself.</dd>
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<dd><code class="module"><a href="./mod/mod_ssl.html">mod_ssl</a></code> now also supports OCSP stapling, where the
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server pro-actively obtains an OCSP verification of its certificate and
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transmits that to the client during the handshake. </dd>
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<dd><code class="module"><a href="./mod/mod_ssl.html">mod_ssl</a></code> can now be configured to share SSL Session
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data between servers through memcached</dd>
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<dt><code class="module"><a href="./mod/mod_lua.html">mod_lua</a></code></dt>
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<dd>Embeds the <a href="http://www.lua.org/">Lua</a> language into httpd,
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for configuration and small business logic functions.</dd>
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<dt><code class="module"><a href="./mod/mod_proxy.html">mod_proxy</a></code></dt>
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<dd>The <code class="directive"><a href="./mod/mod_proxy.html#proxypass">ProxyPass</a></code> directive
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is now most optimally configured within a
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<code class="directive"><a href="./mod/core.html#location">Location</a></code> or
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<code class="directive"><a href="./mod/core.html#locationmatch">LocationMatch</a></code>
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block, and offers a significant performance advantage over the traditional
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two-parameter syntax when present in large numbers.</dd>
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<dt><code class="module"><a href="./mod/mod_proxy_fcgi.html">mod_proxy_fcgi</a></code></dt>
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<dd>FastCGI Protocol backend for <code class="module"><a href="./mod/mod_proxy.html">mod_proxy</a></code></dd>
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<dt><code class="module"><a href="./mod/mod_cache.html">mod_cache</a></code></dt>
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<dd><code class="module"><a href="./mod/mod_cache.html">mod_cache</a></code> can now cache HEAD requests.</dd>
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<dd>Where possible, <code class="module"><a href="./mod/mod_cache.html">mod_cache</a></code> directives can now be set
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per directory, instead of per server.</dd>
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<dd>The base URL of cached URLs can be customised, so that a cluster of
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caches can share the same endpoint URL prefix.</dd>
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<dd><code class="module"><a href="./mod/mod_cache.html">mod_cache</a></code> is now capable of serving stale cached
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data when a backend is unavailable (error 5xx).</dd>
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<dd><code class="module"><a href="./mod/mod_cache.html">mod_cache</a></code> can now insert HIT/MISS/REVALIDATE into
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an X-Cache header.</dd>
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<dt><code class="module"><a href="./mod/mod_allowmethods.html">mod_allowmethods</a></code></dt>
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<dd>New module to restrict certain HTTP methods without interfering with
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authentication or authorization.</dd>
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<dt><code class="module"><a href="./mod/mod_include.html">mod_include</a></code></dt>
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<dd>Support for the 'onerror' attribute within an 'include' element,
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allowing an error document to be served on error instead of the default
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error string.</dd>
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</dl>
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</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="programs" id="programs">Program Enhancements</a></h2>
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<dl>
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<dt>fcgistarter</dt>
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<dd>FastCGI deamon starter utility</dd>
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<dt>htcacheclean</dt>
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<dd>Current cached URLs can now be listed, with optional metadata
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included.</dd>
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<dd>Allow explicit deletion of individual cached URLs from the
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cache.</dd>
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<dd>File sizes can now be rounded up to the given block size, making
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the size limits map more closely to the real size on disk.</dd>
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<dd>Cache size can now be limited by the number of inodes, instead
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of or in addition to being limited by the size of the files on
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disk.</dd>
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</dl>
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</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="developer" id="developer">Module Developer Changes</a></h2>
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<dl>
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<dt>Check Configuration Hook Added</dt>
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<dd>A new hook, <code>check_config</code>, has been added which runs
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between the <code>pre_config</code> and <code>open_logs</code>
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hooks. It also runs before the <code>test_config</code> hook
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when the <code>-t</code> option is passed to
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<code class="program"><a href="./programs/httpd.html">httpd</a></code>. The <code>check_config</code> hook
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allows modules to review interdependent configuration directive
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values and adjust them while messages can still be logged to the
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console. The user can thus be alerted to misconfiguration problems
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before the core <code>open_logs</code> hook function redirects
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console output to the error log.</dd>
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<dt>Expression Parser Added</dt>
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<dd>We now have a general-purpose expression parser, whose API is
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exposed in <var>ap_expr.h</var>. This is adapted from the
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expression parser previously implemented in
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<code class="module"><a href="./mod/mod_include.html">mod_include</a></code>.</dd>
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<dt>Authorization Logic Containers</dt>
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<dd>Advanced authorization logic may now be specified using the
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<code class="directive"><a href="./mod/mod_authz_core.html#require">Require</a></code> directive
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and the related container directives, such as
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<code class="directive"><a href="./mod/mod_authz_core.html#requireall"><RequireAll></a></code>, all
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provided by the <code class="module"><a href="./mod/mod_authz_core.html">mod_authz_core</a></code> module.</dd>
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<dt>Small-Object Caching Interface</dt>
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<dd>The <var>ap_socache.h</var> header exposes a provider-based
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interface for caching small data objects, based on the previous
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implementation of the <code class="module"><a href="./mod/mod_ssl.html">mod_ssl</a></code> session cache.
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Providers using a shared-memory cyclic buffer, disk-based dbm
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files, and a memcache distributed cache are currently
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supported.</dd>
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<dt>Cache Status Hook Added</dt>
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<dd>The <code class="module"><a href="./mod/mod_cache.html">mod_cache</a></code> module now includes a new
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<code>cache_status</code> hook, which is called when the caching
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decision becomes known. A default implementation is provided
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which adds an optional <code>X-Cache</code> and
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<code>X-Cache-Detail</code> header to the response.</dd>
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</dl>
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<p>The developer documentation contains a
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<a href="developer/new_api_2_4.html">detailed list of API changes</a>.</p>
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</div></div>
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<div class="bottomlang">
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<p><span>Available Languages: </span><a href="./en/new_features_2_4.html" title="English"> en </a> |
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<a href="./fr/new_features_2_4.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p>
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</div><div id="footer">
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<p class="apache">Copyright 2010 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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<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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</body></html> |