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<?xml version="1.0" encoding="ISO-8859-1"?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><!-- XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX This file is generated from xml source: DO NOT EDIT XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX --><title>Overview of new features in Apache 2.2 - Apache HTTP Server</title><link href="./style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" /><link href="./style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" /><link href="./style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /><link href="./images/favicon.ico" rel="shortcut icon" /></head><body id="manual-page"><div id="page-header"><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><p class="apache">Apache HTTP Server Version 2.2</p><img alt="" src="./images/feather.gif" /></div><div class="up"><a href="./"><img title="<-" alt="<-" src="./images/left.gif" /></a></div><div id="path"><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 2.2</a></div><div id="page-content"><div id="preamble"><h1>Overview of new features in Apache 2.2</h1><div class="toplang"><p><span>Available Languages: </span><a href="./en/new_features_2_2.html" title="English"> en </a> |<a href="./fr/new_features_2_2.html" hreflang="fr" rel="alternate" title="Fran鏰is"> fr </a> |<a href="./ko/new_features_2_2.html" hreflang="ko" rel="alternate" title="Korean"> ko </a> |<a href="./pt-br/new_features_2_2.html" hreflang="pt-br" rel="alternate" title="Portugu阺 (Brasil)"> pt-br </a></p></div> <p>This document describes some of the major changes between the 2.0 and 2.2 versions of the Apache HTTP Server. For new features since version 1.3, see the <a href="new_features_2_0.html">2.0 new features</a> document.</p></div><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></ul></div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div><div class="section"><h2><a name="core" id="core">Core Enhancements</a></h2> <dl> <dt>Authn/Authz</dt> <dd>The bundled authentication and authorization modules have been refactored. The new <code class="module"><a href="./mod/mod_authn_alias.html">mod_authn_alias</a></code> module can greatly simplify certain authentication configurations. See <a href="#module">module name changes</a>, and <a href="#developer">the developer changes</a> for more information about how these changes affects users and module writers.</dd> <dt>Caching</dt> <dd><code class="module"><a href="./mod/mod_cache.html">mod_cache</a></code>, <code class="module"><a href="./mod/mod_disk_cache.html">mod_disk_cache</a></code>, and <code class="module"><a href="./mod/mod_mem_cache.html">mod_mem_cache</a></code> have undergone a lot of changes, and are now considered production-quality. <code class="program"><a href="./programs/htcacheclean.html">htcacheclean</a></code> has been introduced to clean up <code class="module"><a href="./mod/mod_disk_cache.html">mod_disk_cache</a></code> setups.</dd> <dt>Configuration</dt> <dd>The default configuration layout has been simplified and modularised. Configuration snippets which can be used to enable commonly-used features are now bundled with Apache, and can be easily added to the main server config.</dd> <dt>Graceful stop</dt> <dd>The <code class="module"><a href="./mod/prefork.html">prefork</a></code>, <code class="module"><a href="./mod/worker.html">worker</a></code> and <code class="module"><a href="./mod/event.html">event</a></code> MPMs now allow <code class="program"><a href="./programs/httpd.html">httpd</a></code> to be shutdown gracefully via the <a href="stopping.html#gracefulstop"><code>graceful-stop</code></a> signal. The <code class="directive"><a href="./mod/mpm_common.html#gracefulshutdowntimeout">GracefulShutdownTimeout</a></code> directive has been added to specify an optional timeout, after which <code class="program"><a href="./programs/httpd.html">httpd</a></code> will terminate regardless of the status of any requests being served.</dd> <dt>Proxying</dt> <dd>The new <code class="module"><a href="./mod/mod_proxy_balancer.html">mod_proxy_balancer</a></code> module provides load balancing services for <code class="module"><a href="./mod/mod_proxy.html">mod_proxy</a></code>. The new <code class="module"><a href="./mod/mod_proxy_ajp.html">mod_proxy_ajp</a></code> module adds support for the <code>Apache JServ Protocol version 1.3</code> used by <a href="http://jakarta.apache.org/tomcat/">Apache Tomcat</a>.</dd> <dt>Regular Expression Library Updated</dt> <dd>Version 5.0 of the <a href="http://www.pcre.org/">Perl Compatible Regular Expression Library</a> (PCRE) is now included. <code class="program"><a href="./programs/httpd.html">httpd</a></code> can be configured to use a system installation of PCRE by passing the <code>--with-pcre</code> flag to configure.</dd> <dt>Smart Filtering</dt> <dd><code class="module"><a href="./mod/mod_filter.html">mod_filter</a></code> introduces dynamic configuration to the output filter chain. It enables filters to be conditionally inserted, based on any Request or Response header or environment variable, and dispenses with the more problematic dependencies and ordering problems in the 2.0 architecture.</dd> <dt>Large File Support</dt> <dd>httpd is now built with support for files larger than 2GB on modern 32-bit Unix systems. Support for handling >2GB request bodies has also been added.</dd> <dt>Event MPM</dt> <dd>The <code class="module"><a href="./mod/event.html">event</a></code> MPM uses a separate thread to handle Keep Alive requests and accepting connections. Keep Alive requests have traditionally required httpd to dedicate a worker to handle it. This dedicated worker could not be used again until the Keep Alive timeout was reached.</dd> <dt>SQL Database Support</dt> <dd><p><code class="module"><a href="./mod/mod_dbd.html">mod_dbd</a></code>, together with the apr_dbd framework, brings direct SQL support to modules that need it. Supports connection pooling in threaded MPMs.</p> </dd> </dl> </div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div><div class="section"><h2><a name="module" id="module">Module Enhancements</a></h2> <dl> <dt>Authn/Authz</dt> <dd>Modules in the aaa directory have been renamed and offer better support for digest authentication. For example, mod_auth is now split into <code class="module"><a href="./mod/mod_auth_basic.html">mod_auth_basic</a></code> and <code class="module"><a href="./mod/mod_authn_file.html">mod_authn_file</a></code>; mod_auth_dbm is now called <code class="module"><a href="./mod/mod_authn_dbm.html">mod_authn_dbm</a></code>; mod_access has been renamed <code class="module"><a href="./mod/mod_authz_host.html">mod_authz_host</a></code>. There is also a new <code class="module"><a href="./mod/mod_authn_alias.html">mod_authn_alias</a></code> module for simplifying certain authentication configurations. </dd> <dt><code class="module"><a href="./mod/mod_authnz_ldap.html">mod_authnz_ldap</a></code></dt> <dd>This module is a port of the 2.0 <code>mod_auth_ldap</code> module to the 2.2 <code>Authn/Authz</code> framework. New features include using LDAP attribute values and complicated search filters in the ⌨️ 快捷键说明
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