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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>Apache Tutorial: .htaccess files - 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 2.0</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 2.0</a> > <a href="./">How-To / Tutorials</a></div><div id="page-content"><div id="preamble"><h1>Apache Tutorial: .htaccess files</h1><div class="toplang"><p><span>Available Languages: </span><a href="../en/howto/htaccess.html" title="English"> en </a> |<a href="../ja/howto/htaccess.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |<a href="../ko/howto/htaccess.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p></div><p><code>.htaccess</code> files provide a way to make configurationchanges on a per-directory basis.</p></div><div id="quickview"><ul id="toc"><li><img alt="" src="../images/down.gif" /> <a href="#related">.htaccess files</a></li><li><img alt="" src="../images/down.gif" /> <a href="#what">What they are/How to use them</a></li><li><img alt="" src="../images/down.gif" /> <a href="#when">When (not) to use .htaccess files</a></li><li><img alt="" src="../images/down.gif" /> <a href="#how">How directives are applied</a></li><li><img alt="" src="../images/down.gif" /> <a href="#auth">Authentication example</a></li><li><img alt="" src="../images/down.gif" /> <a href="#ssi">Server Side Includes example</a></li><li><img alt="" src="../images/down.gif" /> <a href="#cgi">CGI example</a></li><li><img alt="" src="../images/down.gif" /> <a href="#troubleshoot">Troubleshooting</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="related" id="related">.htaccess files</a></h2> <table class="related"><tr><th>Related Modules</th><th>Related Directives</th></tr><tr><td><ul><li><code class="module"><a href="../mod/core.html">core</a></code></li><li><code class="module"><a href="../mod/mod_auth.html">mod_auth</a></code></li><li><code class="module"><a href="../mod/mod_cgi.html">mod_cgi</a></code></li><li><code class="module"><a href="../mod/mod_include.html">mod_include</a></code></li><li><code class="module"><a href="../mod/mod_mime.html">mod_mime</a></code></li></ul></td><td><ul><li><code class="directive"><a href="../mod/core.html#accessfilename">AccessFileName</a></code></li><li><code class="directive"><a href="../mod/core.html#allowoverride">AllowOverride</a></code></li><li><code class="directive"><a href="../mod/core.html#options">Options</a></code></li><li><code class="directive"><a href="../mod/mod_mime.html#addhandler">AddHandler</a></code></li><li><code class="directive"><a href="../mod/core.html#sethandler">SetHandler</a></code></li><li><code class="directive"><a href="../mod/core.html#authtype">AuthType</a></code></li><li><code class="directive"><a href="../mod/core.html#authname">AuthName</a></code></li><li><code class="directive"><a href="../mod/mod_auth.html#authuserfile">AuthUserFile</a></code></li><li><code class="directive"><a href="../mod/mod_auth.html#authgroupfile">AuthGroupFile</a></code></li><li><code class="directive"><a href="../mod/core.html#require">Require</a></code></li></ul></td></tr></table></div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><div class="section"><h2><a name="what" id="what">What they are/How to use them</a></h2> <p><code>.htaccess</code> files (or "distributed configuration files") provide a way to make configuration changes on a per-directory basis. A file, containing one or more configuration directives, is placed in a particular document directory, and the directives apply to that directory, and all subdirectories thereof.</p> <div class="note"><h3>Note:</h3> <p>If you want to call your <code>.htaccess</code> file something else, you can change the name of the file using the <code class="directive"><a href="../mod/core.html#accessfilename">AccessFileName</a></code> directive. For example, if you would rather call the file <code>.config</code> then you can put the following in your server configuration file:</p> <div class="example"><p><code> AccessFileName .config </code></p></div> </div> <p>In general, <code>.htaccess</code> files use the same syntax as the <a href="../configuring.html#syntax">main configuration files</a>. What you can put in these files is determined by the <code class="directive"><a href="../mod/core.html#allowoverride">AllowOverride</a></code> directive. This directive specifies, in categories, what directives will be honored if they are found in a <code>.htaccess</code> file. If a directive is permitted in a <code>.htaccess</code> file, the documentation for that directive will contain an Override section, specifying what value must be in <code class="directive"><a href="../mod/core.html#allowoverride">AllowOverride</a></code> in order for that directive to be permitted.</p> <p>For example, if you look at the documentation for the <code class="directive"><a href="../mod/core.html#adddefaultcharset">AddDefaultCharset</a></code> directive, you will find that it is permitted in <code>.htaccess</code> files. (See the Context line in the directive summary.) The <a href="../mod/directive-dict.html#Context">Override</a> line reads <code>FileInfo</code>. Thus, you must have at least <code>AllowOverride FileInfo</code> in order for this directive to be honored in <code>.htaccess</code> files.</p> <div class="example"><h3>Example:</h3><table> <tr> <td><a href="../mod/directive-dict.html#Context">Context:</a></td> <td>server config, virtual host, directory, .htaccess</td> </tr> <tr> <td><a href="../mod/directive-dict.html#Override">Override:</a></td> <td>FileInfo</td> </tr> </table></div> <p>If you are unsure whether a particular directive is permitted in a <code>.htaccess</code> file, look at the documentation for that directive, and check the Context line for ".htaccess".</p> </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><div class="section"><h2><a name="when" id="when">When (not) to use .htaccess files</a></h2> <p>In general, you should never use <code>.htaccess</code> files unless you don't have access to the main server configuration file. There is, for example, a prevailing misconception that user authentication should always be done in <code>.htaccess</code> files. This is simply not the case. You can put user authentication configurations in the main server configuration, and this is, in fact, the preferred way to do things.</p> <p><code>.htaccess</code> files should be used in a case where the content providers need to make configuration changes to the server on a per-directory basis, but do not have root access on the server system. In the event that the server administrator is not willing to make frequent configuration changes, it might be desirable to permit individual users to make these changes in <code>.htaccess</code> files for themselves. This is particularly true, for example, in cases where ISPs are hosting multiple user sites on a single machine, and want their users to be able to alter their configuration.</p> <p>However, in general, use of <code>.htaccess</code> files should be avoided when possible. Any configuration that you would consider putting in a <code>.htaccess</code> file, can just as effectively be made in a <code class="directive"><a href="../mod/core.html#directory"><Directory></a></code> section in your main server configuration file.</p> <p>There are two main reasons to avoid the use of <code>.htaccess</code> files.</p> <p>The first of these is performance. When <code class="directive"><a href="../mod/core.html#allowoverride">AllowOverride</a></code> is set to allow the use of <code>.htaccess</code> files, Apache will look in every directory for <code>.htaccess</code> files. Thus, permitting <code>.htaccess</code> files causes a performance hit, whether or not you actually even use them! Also, the <code>.htaccess</code> file is loaded every time a document is requested.</p> <p>Further note that Apache must look for <code>.htaccess</code> files in all higher-level directories, in order to have a full complement of directives that it must apply. (See section on <a href="#how">how directives are applied</a>.) Thus, if a file is requested out of a directory <code>/www/htdocs/example</code>, Apache must look for the following files:</p> <div class="example"><p><code> /.htaccess<br /> /www/.htaccess<br /> /www/htdocs/.htaccess<br /> /www/htdocs/example/.htaccess </code></p></div> <p>And so, for each file access out of that directory, there are 4 additional file-system accesses, even if none of those files are present. (Note that this would only be the case if <code>.htaccess</code> files were enabled for <code>/</code>, which is not usually the case.)</p> <p>The second consideration is one of security. You are permitting users to modify server configuration, which may result in changes over which you have no control. Carefully consider whether you want to give your users this privilege. Note also that giving users less privileges than they need will lead to additional technical support requests. Make sure you clearly tell your users what level of privileges you have given them. Specifying exactly what you have set <code class="directive"><a href="../mod/core.html#allowoverride">AllowOverride</a></code> to, and pointing them to the relevant documentation, will save yourself a lot of confusion later.</p> <p>Note that it is completely equivalent to put a <code>.htaccess</code> file in a directory <code>/www/htdocs/example</code> containing a directive, and to put that same directive in a Directory section <code><Directory /www/htdocs/example></code> in your main server configuration:</p> <p><code>.htaccess</code> file in <code>/www/htdocs/example</code>:</p> <div class="example"><h3>Contents of .htaccess file in <code>/www/htdocs/example</code></h3><p><code> AddType text/example .exm </code></p></div> <div class="example"><h3>Section from your <code>httpd.conf</code> file</h3><p><code> <Directory /www/htdocs/example><br /> <span class="indent"> AddType text/example .exm<br /> </span> </Directory> </code></p></div> <p>However, putting this configuration in your server configuration file will result in less of a performance hit, as the configuration is loaded once when Apache starts, rather than every time a file is requested.</p>⌨️ 快捷键说明
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