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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>mod_headers - 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><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> > <a href="./">Modules</a></div><div id="page-content"><div id="preamble"><h1>Apache Module mod_headers</h1><div class="toplang"><p><span>Available Languages: </span><a href="../en/mod/mod_headers.html" title="English"> en </a> |<a href="../ja/mod/mod_headers.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |<a href="../ko/mod/mod_headers.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p></div><table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Customization of HTTP request and responseheaders</td></tr><tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr><tr><th><a href="module-dict.html#ModuleIdentifier">Module營dentifier:</a></th><td>headers_module</td></tr><tr><th><a href="module-dict.html#SourceFile">Source燜ile:</a></th><td>mod_headers.c</td></tr></table><h3>Summary</h3> <p>This module provides directives to control and modify HTTP request and response headers. Headers can be merged, replaced or removed.</p></div><div id="quickview"><h3 class="directives">Directives</h3><ul id="toc"><li><img alt="" src="../images/down.gif" /> <a href="#header">Header</a></li><li><img alt="" src="../images/down.gif" /> <a href="#requestheader">RequestHeader</a></li></ul><h3>Topics</h3><ul id="topics"><li><img alt="" src="../images/down.gif" /> <a href="#order">Order of Processing</a></li><li><img alt="" src="../images/down.gif" /> <a href="#early">Early and Late Processing</a></li><li><img alt="" src="../images/down.gif" /> <a href="#examples">Examples</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="order" id="order">Order of Processing</a></h2> <p>The directives provided by <code class="module"><a href="../mod/mod_headers.html">mod_headers</a></code> can occur almost anywhere within the server configuration, and can be limited in scope by enclosing them in <a href="../sections.html">configuration sections</a>.</p> <p>Order of processing is important and is affected both by the order in the configuration file and by placement in <a href="../sections.html#mergin">configuration sections</a>. These two headers have a different effect if reversed:</p> <div class="example"><p><code> RequestHeader append MirrorID "mirror 12"<br /> RequestHeader unset MirrorID </code></p></div> <p>This way round, the <code>MirrorID</code> header is not set. If reversed, the MirrorID header is set to "mirror 12".</p></div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><div class="section"><h2><a name="early" id="early">Early and Late Processing</a></h2> <p><code class="module"><a href="../mod/mod_headers.html">mod_headers</a></code> can be applied either early or late in the request. The normal mode is late, when Request Headers are set immediately before running the content generator and Response Headers just as the response is sent down the wire. Always use Late mode in an operational server.</p> <p>Early mode is designed as a test/debugging aid for developers. Directives defined using the <code>early</code> keyword are set right at the beginning of processing the request. This means they can be used to simulate different requests and set up test cases, but it also means that headers may be changed at any time by other modules before generating a Response.</p> <p>Because early directives are processed before the request path's configuration is traversed, early headers can only be set in a main server or virtual host context. Early directives cannot depend on a request path, so they will fail in contexts such as <code><Directory></code> or <code><Location></code>.</p></div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><div class="section"><h2><a name="examples" id="examples">Examples</a></h2> <ol> <li> Copy all request headers that begin with "TS" to the response headers: <div class="example"><p><code> Header echo ^TS </code></p></div> </li> <li> Add a header, <code>MyHeader</code>, to the response including a timestamp for when the request was received and how long it took to begin serving the request. This header can be used by the client to intuit load on the server or in isolating bottlenecks between the client and the server. <div class="example"><p><code> Header set MyHeader "%D %t" </code></p></div> <p>results in this header being added to the response:</p> <div class="example"><p><code> MyHeader: D=3775428 t=991424704447256 </code></p></div> </li> <li> Say hello to Joe <div class="example"><p><code> Header set MyHeader "Hello Joe. It took %D microseconds \<br /> for Apache to serve this request." </code></p></div> <p>results in this header being added to the response:</p> <div class="example"><p><code> MyHeader: Hello Joe. It took D=3775428 microseconds for Apache to serve this request. </code></p></div> </li> <li> Conditionally send <code>MyHeader</code> on the response if and only if header <code>MyRequestHeader</code> is present on the request. This is useful for constructing headers in response to some client stimulus. Note that this example requires the services of the <code class="module"><a href="../mod/mod_setenvif.html">mod_setenvif</a></code> module. <div class="example"><p><code> SetEnvIf MyRequestHeader myvalue HAVE_MyRequestHeader<br /> Header set MyHeader "%D %t mytext" env=HAVE_MyRequestHeader </code></p></div> <p>If the header <code>MyRequestHeader: myvalue</code> is present on the HTTP request, the response will contain the following header:</p> <div class="example"><p><code> MyHeader: D=3775428 t=991424704447256 mytext </code></p></div> </li> <li> Enable DAV to work with Apache running HTTP through SSL hardware (<a href="http://svn.haxx.se/users/archive-2006-03/0549.shtml">problem description</a>) by replacing <var>https:</var> with <var>http:</var> in the <var>Destination</var> header: <div class="example"><p><code> RequestHeader edit Destination ^https: http: early </code></p></div> </li> <li> Set the same header value under multiple non-exclusive conditions, but do not duplicate the value in the final header. If all of the following conditions applied to a request (i.e., if the <code>CGI</code>, <code>NO_CACHE</code> and <code>NO_STORE</code> environment variables all existed for the request): <div class="example"><p><code> Header merge Cache-Control no-cache env=CGI<br /> Header merge Cache-Control no-cache env=NO_CACHE<br /> Header merge Cache-Control no-store env=NO_STORE </code></p></div> <p>then the response would contain the following header:</p> <div class="example"><p><code> Cache-Control: no-cache, no-store </code></p></div> <p>If <code>append</code> was used instead of <code>merge</code>, then the response would contain the following header:</p> <div class="example"><p><code> Cache-Control: no-cache, no-cache, no-store </code></p></div> </li> </ol></div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><div class="directive-section"><h2><a name="Header" id="Header">Header</a> <a name="header" id="header">Directive</a></h2><table class="directive"><tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Configure HTTP response headers</td></tr><tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>Header [<var>condition</var>] set|append|merge|add|unset|echo|edit<var>header</var> [<var>value</var>] [early|env=[!]<var>variable</var>]</code></td></tr><tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr><tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr><tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr><tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_headers</td></tr><tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>The <code>merge</code> argument is available in version2.2.9 and later. The <code>edit</code> argument is available in version2.2.4 and later.</td></tr></table> <p>This directive can replace, merge or remove HTTP response headers. The header is modified just after the content handler and output filters are run, allowing outgoing headers to be modified.</p> <p>The optional <var>condition</var> can be either <code>onsuccess</code> or <code>always</code>. It determines, which internal header table should be operated on. <code>onsuccess</code> stands for <code>2<var>xx</var></code> status codes and <code>always</code> for all status codes (including <code>2<var>xx</var></code>). Especially if you want to unset headers set by certain modules, you should try out, which table is affected.</p> <p>The action it performs is determined by the second⌨️ 快捷键说明
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