diff options
Diffstat (limited to 'APACHE_1_3_42/htdocs/manual/mod/mod_negotiation.html.en')
| -rw-r--r-- | APACHE_1_3_42/htdocs/manual/mod/mod_negotiation.html.en | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/APACHE_1_3_42/htdocs/manual/mod/mod_negotiation.html.en b/APACHE_1_3_42/htdocs/manual/mod/mod_negotiation.html.en new file mode 100644 index 0000000000..5ba05f6caf --- /dev/null +++ b/APACHE_1_3_42/htdocs/manual/mod/mod_negotiation.html.en @@ -0,0 +1,220 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" + "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> + +<html xmlns="http://www.w3.org/1999/xhtml"> + <head> + <meta name="generator" content="HTML Tidy, see www.w3.org" /> + + <title>Apache module mod_negotiation</title> + </head> + <!-- Background white, links blue (unvisited), navy (visited), red (active) --> + + <body bgcolor="#FFFFFF" text="#000000" link="#0000FF" + vlink="#000080" alink="#FF0000"> + <!--#include virtual="header.html" --> + + <h1 align="CENTER">Module mod_negotiation</h1> + + <p>This module provides for <a + href="../content-negotiation.html">content negotiation</a>.</p> + + <p><a href="module-dict.html#Status" + rel="Help"><strong>Status:</strong></a> Base<br /> + <a href="module-dict.html#SourceFile" + rel="Help"><strong>Source File:</strong></a> + mod_negotiation.c<br /> + <a href="module-dict.html#ModuleIdentifier" + rel="Help"><strong>Module Identifier:</strong></a> + negotiation_module</p> + + <h2>Summary</h2> + 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. + + <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 MultiViews <a + href="core.html#options">Option</a>, 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="#languagepriority">LanguagePriority</a></li> + </ul> + <strong>See also</strong>: <a + href="./mod_mime.html#defaultlanguage">DefaultLanguage</a>, <a + href="./mod_mime.html#addencoding">AddEncoding</a>, <a + href="./mod_mime.html#addlanguage">AddLanguage</a>, <a + href="./mod_mime.html#addtype">AddType</a>, and <a + href="core.html#options">Options</a>. + + <h2>Type maps</h2> + A type map has the same format as 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: + + <dl> + <dt>Content-Encoding:</dt> + + <dd>The encoding of the file. Apache only recognizes + encodings that are defined by an <a + href="mod_mime.html#addencoding">AddEncoding</a> 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> + + <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> + + <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>level</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 + 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 + resource.</dd> + </dl> + Example: + + <blockquote> + <code>Content-Type: image/jpeg; qs=0.8</code> + </blockquote> + </dd> + + <dt>URI:</dt> + + <dd>The path to the file containing this variant, relative to + the map file.</dd> + </dl> + + <h2>MultiViews</h2> + A MultiViews search is enabled by the MultiViews <a + href="core.html#options">Option</a>. 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 + <code>foo.*</code>, and effectively fakes up a type map which + names all those files, assigning them the same media types and + 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. + <hr /> + + <h2><a id="cachenegotiateddocs" + name="cachenegotiateddocs">CacheNegotiatedDocs</a> + directive</h2> + <a href="directive-dict.html#Syntax" + rel="Help"><strong>Syntax:</strong></a> + CacheNegotiatedDocs<br /> + <a href="directive-dict.html#Context" + rel="Help"><strong>Context:</strong></a> server config<br /> + <a href="directive-dict.html#Status" + rel="Help"><strong>Status:</strong></a> Base<br /> + <a href="directive-dict.html#Module" + rel="Help"><strong>Module:</strong></a> mod_negotiation<br /> + <a href="directive-dict.html#Compatibility" + rel="Help"><strong>Compatibility:</strong></a> + CacheNegotiatedDocs is only available in Apache 1.1 and later. + + <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 + that are not the best match for their abilities, but it will + make caching more efficient.</p> + + <p>This directive only applies to requests which come from + HTTP/1.0 browsers. HTTP/1.1 provides much better control over + the caching of negotiated documents, and this directive has no + effect in responses to HTTP/1.1 requests.</p> + <hr /> + + <h2><a id="languagepriority" + name="languagepriority">LanguagePriority</a> directive</h2> + <!--%plaintext <?INDEX {\tt LanguagePriority} directive> --> + <a href="directive-dict.html#Syntax" + rel="Help"><strong>Syntax:</strong></a> LanguagePriority + <em>MIME-lang</em> [<em>MIME-lang</em>] ...<br /> + <a href="directive-dict.html#Context" + rel="Help"><strong>Context:</strong></a> server config, virtual + host, directory, .htaccess<br /> + <a href="directive-dict.html#Override" + rel="Help"><strong>Override:</strong></a> FileInfo<br /> + <a href="directive-dict.html#Status" + rel="Help"><strong>Status:</strong></a> Base<br /> + <a href="directive-dict.html#Module" + rel="Help"><strong>Module:</strong></a> mod_negotiation + + <p>The LanguagePriority 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> + + <blockquote> + <code>LanguagePriority en fr de</code> + </blockquote> + For a request for <code>foo.html</code>, where + <code>foo.html.fr</code> and <code>foo.html.de</code> both + existed, but the browser did not express a language preference, + then <code>foo.html.fr</code> would be returned. + + <p>Note that this directive only has an effect if a 'best' + language cannot be determined by any other means. Correctly + implemented HTTP/1.1 requests will mean this directive has no + effect.</p> + + <p><strong>See also</strong>: <a + href="./mod_mime.html#defaultlanguage">DefaultLanguage</a> and + <a href="./mod_mime.html#addlanguage">AddLanguage</a> + <!--#include virtual="footer.html" --> + </p> + </body> +</html> + |