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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_negotiation - 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 2.0</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-project/">Documentation</a> > <a href="../">Version 2.0</a> > <a href="./">Modules</a></div><div id="page-content"><div id="preamble"><h1>Apache Module mod_negotiation</h1><div class="toplang"><p><span>Available Languages: </span><a href="../en/mod/mod_negotiation.html" title="English"> en </a> |<a href="../ja/mod/mod_negotiation.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a></p></div><table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Provides for <a href="../content-negotiation.html">content negotiation</a></td></tr><tr><th><a href="module-dict.html#Status">Status:</a></th><td>Base</td></tr><tr><th><a href="module-dict.html#ModuleIdentifier">Module營dentifier:</a></th><td>negotiation_module</td></tr><tr><th><a href="module-dict.html#SourceFile">Source燜ile:</a></th><td>mod_negotiation.c</td></tr></table><h3>Summary</h3> <p>Content negotiation, or more accurately content selection, is the selection of the document that best matches the clients capabilities, from one of several available documents. There are two implementations of this.</p> <ul> <li>A type map (a file with the handler <code>type-map</code>) which explicitly lists the files containing the variants.</li> <li>A MultiViews search (enabled by the <code>MultiViews</code> <code class="directive"><a href="../mod/core.html#options">Options</a></code>), where the server does an implicit filename pattern match, and choose from amongst the results.</li> </ul></div><div id="quickview"><h3 class="directives">Directives</h3><ul id="toc"><li><img alt="" src="../images/down.gif" /> <a href="#cachenegotiateddocs">CacheNegotiatedDocs</a></li><li><img alt="" src="../images/down.gif" /> <a href="#forcelanguagepriority">ForceLanguagePriority</a></li><li><img alt="" src="../images/down.gif" /> <a href="#languagepriority">LanguagePriority</a></li></ul><h3>Topics</h3><ul id="topics"><li><img alt="" src="../images/down.gif" /> <a href="#typemaps">Type maps</a></li><li><img alt="" src="../images/down.gif" /> <a href="#multiviews">MultiViews</a></li></ul><h3>See also</h3><ul class="seealso"><li><code class="directive"><a href="../mod/core.html#options">Options</a></code></li><li><code class="module"><a href="../mod/mod_mime.html">mod_mime</a></code></li><li><a href="../content-negotiation.html">ContentNegotiation</a></li><li><a href="../env.html">Environment Variables</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="typemaps" id="typemaps">Type maps</a></h2> <p>A type map has a format similar to RFC822 mail headers. It contains document descriptions separated by blank lines, with lines beginning with a hash character ('#') treated as comments. A document description consists of several header records; records may be continued on multiple lines if the continuation lines start with spaces. The leading space will be deleted and the lines concatenated. A header record consists of a keyword name, which always ends in a colon, followed by a value. Whitespace is allowed between the header name and value, and between the tokens of value. The headers allowed are: </p> <dl> <dt><code>Content-Encoding:</code></dt> <dd>The encoding of the file. Apache only recognizes encodings that are defined by an <code class="directive"><a href="../mod/mod_mime.html#addencoding">AddEncoding</a></code> directive. This normally includes the encodings <code>x-compress</code> for compress'd files, and <code>x-gzip</code> for gzip'd files. The <code>x-</code> prefix is ignored for encoding comparisons.</dd> <dt><code>Content-Language:</code></dt> <dd>The language(s) of the variant, as an Internet standard language tag (<a href="http://www.ietf.org/rfc/rfc1766.txt">RFC 1766</a>). An example is <code>en</code>, meaning English. If the variant contains more than one language, they are separated by a comma.</dd> <dt><code>Content-Length:</code></dt> <dd>The length of the file, in bytes. If this header is not present, then the actual length of the file is used.</dd> <dt><code>Content-Type:</code></dt> <dd> The MIME media type of the document, with optional parameters. Parameters are separated from the media type and from one another by a semi-colon, with a syntax of <code>name=value</code>. Common parameters include: <dl> <dt><code>level</code></dt> <dd>an integer specifying the version of the media type. For <code>text/html</code> this defaults to 2, otherwise 0.</dd> <dt><code>qs</code></dt> <dd>a floating-point number with a value in the range 0.0 to 1.0, indicating the relative 'quality' of this variant compared to the other available variants, independent of the client's capabilities. For example, a jpeg file is usually of higher source quality than an ascii file if it is attempting to represent a photograph. However, if the resource being represented is ascii art, then an ascii file would have a higher source quality than a jpeg file. All <code>qs</code> values are therefore specific to a given resource.</dd> </dl> <div class="example"><h3>Example</h3><p><code> Content-Type: image/jpeg; qs=0.8 </code></p></div> </dd> <dt><code>URI:</code></dt> <dd>uri of the file containing the variant (of the given media type, encoded with the given content encoding). These are interpreted as URLs relative to the map file; they must be on the same server (!), and they must refer to files to which the client would be granted access if they were to be requested directly.</dd> <dt><code>Body:</code></dt> <dd>New in Apache 2.0, the actual content of the resource may be included in the type-map file using the Body header. This header must contain a string that designates a delimiter for the body content. Then all following lines in the type map file will be considered part of the resource body until the delimiter string is found. <div class="example"><h3>Example:</h3><p><code> Body:----xyz----<br /> <html><br /> <body><br /> <p>Content of the page.</p><br /> </body><br />⌨️ 快捷键说明
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