]> granicus.if.org Git - apache/blobdiff - docs/manual/mod/mod_negotiation.html.en
Merge in APR[-util] macros from branches/trunk-buildconf-noapr
[apache] / docs / manual / mod / mod_negotiation.html.en
index ed1b4aa873dca5d14131f27302bb7ab185f96af1..771d6401a0e68f2993d6d02c60d3ec1dd41f4bac 100644 (file)
@@ -1,11 +1,41 @@
-<html xmlns="http://www.w3.org/TR/xhtml1/strict"><head><!--
+<?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>
+<meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type" />
+<!--
         XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
               This file is generated from xml source: DO NOT EDIT
         XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
-      --><title>mod_negotiation - Apache HTTP Server</title><link href="../style/manual.css" type="text/css" rel="stylesheet"/></head><body><blockquote><div align="center"><img src="../images/sub.gif" alt="[APACHE DOCUMENTATION]"/><h3>Apache HTTP Server Version 2.0</h3></div><h1 align="center">Apache Module mod_negotiation</h1><table cellspacing="1" cellpadding="0" bgcolor="#cccccc"><tr><td><table bgcolor="#ffffff"><tr><td nowrap="nowrap" valign="top"><span class="help">Description:
-                      </span></td><td>Provides for <a href="../content-negotiation.html">content negotiation</a></td></tr><tr><td nowrap="nowrap"><a href="module-dict.html#Status" class="help">Status:
-                      </a></td><td>Base</td></tr><tr><td nowrap="nowrap"><a href="module-dict.html#ModuleIdentifier" class="help">Module&nbsp;Identifier:
-                        </a></td><td>negotiation_module</td></tr></table></td></tr></table><h2>Summary</h2>
+      -->
+<title>mod_negotiation - Apache HTTP Server Version 2.5</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 rel="stylesheet" type="text/css" href="../style/css/prettify.css" />
+<script src="../style/scripts/prettify.min.js" type="text/javascript">
+</script>
+
+<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/quickreference.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p>
+<p class="apache">Apache HTTP Server Version 2.5</p>
+<img alt="" src="../images/feather.png" /></div>
+<div class="up"><a href="./"><img title="&lt;-" alt="&lt;-" src="../images/left.gif" /></a></div>
+<div id="path">
+<a href="http://www.apache.org/">Apache</a> &gt; <a href="http://httpd.apache.org/">HTTP Server</a> &gt; <a href="http://httpd.apache.org/docs/">Documentation</a> &gt; <a href="../">Version 2.5</a> &gt; <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">&nbsp;en&nbsp;</a> |
+<a href="../fr/mod/mod_negotiation.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a> |
+<a href="../ja/mod/mod_negotiation.html" hreflang="ja" rel="alternate" title="Japanese">&nbsp;ja&nbsp;</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 Identifier:</a></th><td>negotiation_module</td></tr>
+<tr><th><a href="module-dict.html#SourceFile">Source File:</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
       <code>type-map</code>) which explicitly lists the files
       containing the variants.</li>
 
-      <li>A MultiViews search (enabled by the MultiViews <a href="../mod/core.html#options" class="directive"><code class="directive">Options</code></a>, where the server does an
-      implicit filename pattern match, and choose from amongst the
+      <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>
-<h2>Directives</h2><ul><li><a href="#cachenegotiateddocs">CacheNegotiatedDocs</a></li><li><a href="#forcelanguagepriority">ForceLanguagePriority</a></li><li><a href="#languagepriority">LanguagePriority</a></li></ul><p><strong>See also </strong></p><ul><li><a href="../mod/mod_mime.html#defaultlanguage" class="directive"><code class="directive">DefaultLanguage</code></a></li><li><a href="../mod/mod_mime.html#addencoding" class="directive"><code class="directive">AddEncoding</code></a></li><li><a href="../mod/mod_mime.html#addlanguage" class="directive"><code class="directive">AddLanguage</code></a></li><li><a href="../mod/mod_mime.html#addtype" class="directive"><code class="directive">AddType</code></a></li><li><a href="../mod/mod_mime.html#multiviewsmatch" class="directive"><code class="directive">MultiViewsMatch</code></a></li></ul><h2><a name="typemaps">Type maps</a></h2>
-    <p>A type map has the same format as RFC822 mail headers. It
+</div>
+<div id="quickview"><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 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>Bugfix checklist</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">httpd changelog</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&amp;list_id=144532&amp;product=Apache%20httpd-2&amp;query_format=specific&amp;order=changeddate%20DESC%2Cpriority%2Cbug_severity&amp;component=mod_negotiation">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&amp;component=mod_negotiation">Report a bug</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">Content
+Negotiation</a></li>
+<li><a href="../env.html">Environment Variables</a></li>
+<li><a href="#comments_section">Comments</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
     and between the tokens of value. The headers allowed are: </p>
 
     <dl>
-      <dt>Content-Encoding:</dt>
-
+      <dt><code>Content-Encoding:</code></dt>
       <dd>The encoding of the file. Apache only recognizes
-      encodings that are defined by an <a href="../mod/mod_mime.html#addencoding" class="directive"><code class="directive">AddEncoding</code></a> directive.
+      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>Content-Language:</dt>
-
-      <dd>The language of the variant, as an Internet standard
-      language tag (RFC 1766). An example is <code>en</code>,
-      meaning English.</dd>
-
-      <dt>Content-Length:</dt>
+      <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>Content-Type:</dt>
+      <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: 
+        The <a class="glossarylink" href="../glossary.html#mime-type" title="see glossary">MIME media type</a> 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>level</dt>
-
+          <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>qs</dt>
-
-          <dd>a floating-point number with a value in the range 0.0
-          to 1.0, indicating the relative 'quality' of this variant
+          <dt><code>qs</code></dt>
+          <dd>a floating-point number with a value in the range 0[.000]
+          to 1[.000], 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 qs values are therefore specific to a given
+          All <code>qs</code> values are therefore specific to a given
           resource.</dd>
         </dl>
-        Example: 
 
-<blockquote><table cellpadding="10"><tr><td bgcolor="#eeeeee"><code>Content-Type: image/jpeg; qs=0.8</code></td></tr></table></blockquote>
+        <div class="example"><h3>Example</h3><p><code>
+          Content-Type: image/jpeg; qs=0.8
+        </code></p></div>
       </dd>
 
-      <dt>URI:</dt>
-
+      <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
+      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>Body:</dt>
-   
-      <dd><p>New in Apache 2.0, the actual content of the resource may
+      <dt><code>Body:</code></dt>
+      <dd>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
+      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.</p>
-
-      <p>Example:</p>
-<blockquote><table cellpadding="10"><tr><td bgcolor="#eeeeee"><code>
-Body:----xyz----<br>
-&lt;html&gt;<br>
-&lt;body&gt;<br>
-&lt;p&gt;Content of the page.&lt;/p&gt;<br>
-&lt;/body&gt;<br>
-&lt;/html&gt;<br>
-----xyz----
-</code></td></tr></table></blockquote>
+      delimiter string is found.
+
+      <div class="example"><h3>Example:</h3><p><code>
+        Body:----xyz----<br />
+        &lt;html&gt;<br />
+        &lt;body&gt;<br />
+        &lt;p&gt;Content of the page.&lt;/p&gt;<br />
+        &lt;/body&gt;<br />
+        &lt;/html&gt;<br />
+        ----xyz----
+      </code></p></div>
       </dd>
     </dl>
-<h2>MultiViews</h2>
 
-    <p>A MultiViews search is enabled by the MultiViews <a href="../mod/core.html#options" class="directive"><code class="directive">Options</code></a>. If the server receives a
+    <p>Consider, for example, a resource called
+    <code>document.html</code> which is available in English, French,
+    and German. The files for each of these are called
+    <code>document.html.en</code>, <code>document.html.fr</code>, and
+    <code>document.html.de</code>, respectively. The type map file will
+    be called <code>document.html.var</code>, and will contain the
+    following:</p>
+
+    <div class="example"><p><code>
+    URI: document.html<br />
+    <br />
+    Content-language: en<br />
+    Content-type: text/html<br />
+    URI: document.html.en<br />
+    <br />
+    Content-language: fr<br />
+    Content-type: text/html<br />
+    URI: document.html.fr<br />
+    <br />
+    Content-language: de<br />
+    Content-type: text/html<br />
+    URI: document.html.de<br />
+    <br />
+
+    </code></p></div>
+
+    <p>All four of these files should be placed in the same directory,
+    and the <code>.var</code> file should be associated with the
+    <code>type-map</code> handler with an <code class="directive"><a href="../mod/mod_mime.html#addhandler">AddHandler</a></code> directive:</p>
+
+    <pre class="prettyprint lang-config">AddHandler type-map .var</pre>
+
+
+    <p>A request for <code>document.html.var</code> in this directory will
+    result in choosing the variant which most closely matches the language preference
+    specified in the user's <code>Accept-Language</code> request
+    header.</p>
+
+    <p>If <code>Multiviews</code> is enabled, and <code class="directive"><a href="../mod/mod_mime.html#multiviewsmatch">MultiviewsMatch</a></code> is set to "handlers" or "any",  a request to
+    <code>document.html</code> will discover <code>document.html.var</code> and
+    continue negotiating with the explicit type map.</p>
+
+    <p>Other configuration directives, such as <code class="directive"><a href="../mod/mod_alias.html#alias">Alias</a></code> can be used to map <code>document.html</code> to
+    <code>document.html.var</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="multiviews" id="multiviews">Multiviews</a></h2>
+    <p>A Multiviews search is enabled by the <code>Multiviews</code>
+    <code class="directive"><a href="../mod/core.html#options">Options</a></code>. If the server receives a
     request for <code>/some/dir/foo</code> and
     <code>/some/dir/foo</code> does <em>not</em> exist, then the
     server reads the directory looking for all files named
@@ -127,15 +222,23 @@ Body:----xyz----<br>
     content-encodings it would have if the client had asked for one
     of them by name. It then chooses the best match to the client's
     requirements, and returns that document.</p>
-<hr/><h2><a name="CacheNegotiatedDocs">CacheNegotiatedDocs</a> <a name="cachenegotiateddocs">Directive</a></h2><table cellpadding="1" cellspacing="0" border="0" bgcolor="#cccccc"><tr><td><table bgcolor="#ffffff"><tr><td nowrap="nowrap"><strong>Description: 
-                  </strong></td><td>Allows content-negotiated documents to be 
-cached by proxy servers</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Syntax" class="help">Syntax:
-                  </a></td><td>CacheNegotiatedDocs on|off</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Default" class="help">Default: 
-                    </a></td><td><code>CacheNegotiatedDocs off</code></td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Context" class="help">Context:
-                  </a></td><td>server config</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Status" class="help">Status:
-                  </a></td><td>Base</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Module" class="help">Module:
-                  </a></td><td>mod_negotiation</td></tr><tr><td nowrap="nowrap" align="left" valign="top"><a href="directive-dict.html#Compatibility" class="help">Compatibility:
-                    </a></td><td>The syntax changed in version 2.0.</td></tr></table></td></tr></table>
+
+    <p>The <code class="directive"><a href="../mod/mod_mime.html#multiviewsmatch">MultiviewsMatch</a></code>
+    directive configures whether Apache will consider files
+    that do not have content negotiation meta-information assigned
+    to them when choosing files.</p>
+</div>
+<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="directive-section"><h2><a name="CacheNegotiatedDocs" id="CacheNegotiatedDocs">CacheNegotiatedDocs</a> <a name="cachenegotiateddocs" id="cachenegotiateddocs">Directive</a></h2>
+<table class="directive">
+<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Allows content-negotiated documents to be
+cached by proxy servers</td></tr>
+<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheNegotiatedDocs On|Off</code></td></tr>
+<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheNegotiatedDocs Off</code></td></tr>
+<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
+<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
+<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_negotiation</td></tr>
+</table>
     <p>If set, this directive allows content-negotiated documents
     to be cached by proxy servers. This could mean that clients
     behind those proxys could retrieve versions of the documents
@@ -147,71 +250,80 @@ cached by proxy servers</td></tr><tr><td nowrap="nowrap"><a href="directive-dict
     the caching of negotiated documents, and this directive has no
     effect in responses to HTTP/1.1 requests.</p>
 
-    <p>Prior to version 2.0,
-    <code class="directive">CacheNegotiatedDocs</code> did not take an
-    argument; it was turned on by the presence of the directive by
-    itself.</p>
-<hr/><h2><a name="ForceLanguagePriority">ForceLanguagePriority</a> <a name="forcelanguagepriority">Directive</a></h2><table cellpadding="1" cellspacing="0" border="0" bgcolor="#cccccc"><tr><td><table bgcolor="#ffffff"><tr><td nowrap="nowrap"><strong>Description: 
-                  </strong></td><td>Action to take if a single acceptable document is not 
-found</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Syntax" class="help">Syntax:
-                  </a></td><td>ForceLanguagePriority None|Prefer|Fallback [Prefer|Fallback]</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Default" class="help">Default: 
-                    </a></td><td><code>ForceLanguagePriority Prefer</code></td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Context" class="help">Context:
-                  </a></td><td>server config, virtual host, directory, .htaccess</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Override" class="help">Override:
-                    </a></td><td>FileInfo</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Status" class="help">Status:
-                  </a></td><td>Base</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Module" class="help">Module:
-                  </a></td><td>mod_negotiation</td></tr><tr><td nowrap="nowrap" align="left" valign="top"><a href="directive-dict.html#Compatibility" class="help">Compatibility:
-                    </a></td><td>Available in version 2.0.30 and later</td></tr></table></td></tr></table>
+
+</div>
+<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="directive-section"><h2><a name="ForceLanguagePriority" id="ForceLanguagePriority">ForceLanguagePriority</a> <a name="forcelanguagepriority" id="forcelanguagepriority">Directive</a></h2>
+<table class="directive">
+<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Action to take if a single acceptable document is not
+found</td></tr>
+<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ForceLanguagePriority None|Prefer|Fallback [Prefer|Fallback]</code></td></tr>
+<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ForceLanguagePriority Prefer</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>Base</td></tr>
+<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_negotiation</td></tr>
+</table>
     <p>The <code class="directive">ForceLanguagePriority</code> directive uses
-    the given <a href="#languagepriority" class="directive"><code class="directive">LanguagePriority</code></a> to satisfy
-    negotation where the server could otherwise not return a single
+    the given <code class="directive"><a href="#languagepriority">LanguagePriority</a></code> to satisfy
+    negotiation where the server could otherwise not return a single
     matching document.</p>
 
     <p><code>ForceLanguagePriority Prefer</code> uses
     <code>LanguagePriority</code> to serve a one valid result, rather
     than returning an HTTP result 300 (MULTIPLE CHOICES) when there
     are several equally valid choices.  If the directives below were
-    given, and the user's Accept-Language header assigned en and de
-    each as quality .500 (equally acceptable) then the first matching
-    variant, en, will be served.</p>
+    given, and the user's <code>Accept-Language</code> header assigned
+    <code>en</code> and <code>de</code> each as quality <code>.500</code>
+    (equally acceptable) then the first matching variant, <code>en</code>,
+    will be served.</p>
+
+    <pre class="prettyprint lang-config">LanguagePriority en fr de
+ForceLanguagePriority Prefer</pre>
 
-<blockquote><table cellpadding="10"><tr><td bgcolor="#eeeeee"><code>
-      LanguagePriority en fr de<br>
-      ForceLanguagePriority Prefer
-</code></td></tr></table></blockquote>
 
     <p><code>ForceLanguagePriority Fallback</code> uses
-    <code>LanguagePriority</code> to serve a valid result, rather than
-    returning an HTTP result 406 (NOT ACCEPTABLE).  If the directives
-    below were given, and the user's Accept-Language only permitted an
-    es language response, but such a variant isn't found, then the
-    first variant from the LanguagePriority list below will be
-    served.</p>
-
-<blockquote><table cellpadding="10"><tr><td bgcolor="#eeeeee"><code>
-      LanguagePriority en fr de<br>
-      ForceLanguagePriority Fallback
-</code></td></tr></table></blockquote>
-
-    <p>Both options, Prefer and Fallback, may be specified, so either the
-    first matching variant from LanguagePriority will be served if more
-    that one variant is acceptable, or first available document will be
-    served if none of the variants matched the client's acceptable list of
-    languages.</p>
-<hr/><h2><a name="LanguagePriority">LanguagePriority</a> <a name="languagepriority">Directive</a></h2><table cellpadding="1" cellspacing="0" border="0" bgcolor="#cccccc"><tr><td><table bgcolor="#ffffff"><tr><td nowrap="nowrap"><strong>Description: 
-                  </strong></td><td>The precendence of language variants for cases where
-the client does not express a preference</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Syntax" class="help">Syntax:
-                  </a></td><td>LanguagePriority <em>MIME-lang</em> [<em>MIME-lang</em>] ...</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Context" class="help">Context:
-                  </a></td><td>server config, virtual host, directory, .htaccess</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Override" class="help">Override:
-                    </a></td><td>FileInfo</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Status" class="help">Status:
-                  </a></td><td>Base</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Module" class="help">Module:
-                  </a></td><td>mod_negotiation</td></tr></table></td></tr></table>
+    <code class="directive"><a href="#languagepriority">LanguagePriority</a></code> to
+    serve a valid result, rather than returning an HTTP result 406
+    (NOT ACCEPTABLE). If the directives below were given, and the user's
+    <code>Accept-Language</code> only permitted an <code>es</code>
+    language response, but such a variant isn't found, then the first
+    variant from the <code class="directive"><a href="#languagepriority">LanguagePriority</a></code> list below will be served.</p>
+
+    <pre class="prettyprint lang-config">LanguagePriority en fr de
+ForceLanguagePriority Fallback</pre>
+
+
+    <p>Both options, <code>Prefer</code> and <code>Fallback</code>, may be
+    specified, so either the first matching variant from <code class="directive"><a href="#languagepriority">LanguagePriority</a></code> will be served if
+    more than one variant is acceptable, or first available document will
+    be served if none of the variants matched the client's acceptable list
+    of languages.</p>
+
+<h3>See also</h3>
+<ul>
+<li><code class="directive"><a href="../mod/mod_mime.html#addlanguage">AddLanguage</a></code></li>
+</ul>
+</div>
+<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="directive-section"><h2><a name="LanguagePriority" id="LanguagePriority">LanguagePriority</a> <a name="languagepriority" id="languagepriority">Directive</a></h2>
+<table class="directive">
+<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The precedence of language variants for cases where
+the client does not express a preference</td></tr>
+<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LanguagePriority <var>MIME-lang</var> [<var>MIME-lang</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>Base</td></tr>
+<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_negotiation</td></tr>
+</table>
     <p>The <code class="directive">LanguagePriority</code> sets the precedence
     of language variants for the case where the client does not
-    express a preference, when handling a MultiViews request. The list
-    of <em>MIME-lang</em> are in order of decreasing preference.
-    Example:</p>
+    express a preference, when handling a Multiviews request. The list
+    of <var>MIME-lang</var> are in order of decreasing preference.</p>
+
+    <pre class="prettyprint lang-config">LanguagePriority en fr de</pre>
 
-<blockquote><table cellpadding="10"><tr><td bgcolor="#eeeeee"><code>LanguagePriority en fr de</code></td></tr></table></blockquote>
 
     <p>For a request for <code>foo.html</code>, where
     <code>foo.html.fr</code> and <code>foo.html.de</code> both
@@ -219,7 +331,42 @@ the client does not express a preference</td></tr><tr><td nowrap="nowrap"><a hre
     then <code>foo.html.fr</code> would be returned.</p>
 
     <p>Note that this directive only has an effect if a 'best'
-    language cannot be determined by any other means or the <a href="#forcelanguagepriority" class="directive"><code class="directive">ForceLanguagePriority</code></a> directive
-    is not <code>None</code>. Correctly implemented HTTP/1.1 requests
-    will mean this directive has no effect.</p>
-<hr/></blockquote><h3 align="center">Apache HTTP Server Version 2.0</h3><a href="./"><img src="../images/index.gif" alt="Index"/></a><a href="../"><img src="../images/home.gif" alt="Home"/></a></body></html>
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+    language cannot be determined by any other means or the <code class="directive"><a href="#forcelanguagepriority">ForceLanguagePriority</a></code> directive
+    is not <code>None</code>. In general, the client determines the
+    language preference, not the server.</p>
+
+<h3>See also</h3>
+<ul>
+<li><code class="directive"><a href="../mod/mod_mime.html#addlanguage">AddLanguage</a></code></li>
+</ul>
+</div>
+</div>
+<div class="bottomlang">
+<p><span>Available Languages: </span><a href="../en/mod/mod_negotiation.html" title="English">&nbsp;en&nbsp;</a> |
+<a href="../fr/mod/mod_negotiation.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a> |
+<a href="../ja/mod/mod_negotiation.html" hreflang="ja" rel="alternate" title="Japanese">&nbsp;ja&nbsp;</a></p>
+</div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&amp;A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed again by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Freenode, or sent to our <a href="http://httpd.apache.org/lists.html">mailing lists</a>.</div>
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