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<title>mod_negotiation - Apache HTTP Server</title>
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<p class="apache">Apache HTTP Server Version 2.0</p>
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<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>
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<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">Content
Negotiation</a></li>
<li><a href="../env.html">Environment Variables</a></li>
</ul></div>
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<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 />
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