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8 <title>Filters - Apache HTTP Server</title>
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15 <p class="apache">Apache HTTP Server Version 2.0</p>
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19 <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 2.0</a></div><div id="page-content"><div id="preamble"><h1>Filters</h1>
21 <p><span>Available Languages: </span><a href="./en/filter.html" title="English"> en </a> |
22 <a href="./es/filter.html" hreflang="es" rel="alternate" title="Español"> es </a> |
23 <a href="./fr/filter.html" hreflang="fr" rel="alternate" title="Français"> fr </a> |
24 <a href="./ja/filter.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
25 <a href="./ko/filter.html" hreflang="ko" rel="alternate" title="Korean"> ko </a> |
26 <a href="./ru/filter.html" hreflang="ru" rel="alternate" title="Russian"> ru </a> |
27 <a href="./tr/filter.html" hreflang="tr" rel="alternate" title="Türkçe"> tr </a></p>
30 <p>This document describes the use of filters in Apache.</p>
32 <div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
34 <h2><a name="filters" id="filters">Filters</a></h2>
36 <table class="related"><tr><th>Related Modules</th><th>Related Directives</th></tr><tr><td><ul><li><code class="module"><a href="./mod/mod_deflate.html">mod_deflate</a></code></li><li><code class="module"><a href="./mod/mod_ext_filter.html">mod_ext_filter</a></code></li><li><code class="module"><a href="./mod/mod_include.html">mod_include</a></code></li></ul></td><td><ul><li><code class="directive"><a href="./mod/mod_mime.html#addinputfilter">AddInputFilter</a></code></li><li><code class="directive"><a href="./mod/mod_mime.html#addoutputfilter">AddOutputFilter</a></code></li><li><code class="directive"><a href="./mod/mod_mime.html#removeinputfilter">RemoveInputFilter</a></code></li><li><code class="directive"><a href="./mod/mod_mime.html#removeoutputfilter">RemoveOutputFilter</a></code></li><li><code class="directive"><a href="./mod/mod_ext_filter.html#extfilterdefine">ExtFilterDefine</a></code></li><li><code class="directive"><a href="./mod/mod_ext_filter.html#extfilteroptions">ExtFilterOptions</a></code></li><li><code class="directive"><a href="./mod/core.html#setinputfilter">SetInputFilter</a></code></li><li><code class="directive"><a href="./mod/core.html#setoutputfilter">SetOutputFilter</a></code></li></ul></td></tr></table>
38 <p>A <em>filter</em> is a process that is applied to data that
39 is sent or received by the server. Data sent by clients to the
40 server is processed by <em>input filters</em> while data sent
41 by the server to the client is processed by <em>output
42 filters</em>. Multiple filters can be applied to the data, and
43 the order of the filters can be explicitly specified.</p>
45 <p>Filters are used internally by Apache to perform functions such
46 as chunking and byte-range request handling. In addition, modules
47 can provide filters that are selectable using run-time
48 configuration directives. The set of filters that apply to data
49 can be manipulated with the
50 <code class="directive"><a href="./mod/core.html#setinputfilter">SetInputFilter</a></code>,
51 <code class="directive"><a href="./mod/core.html#setoutputfilter">SetOutputFilter</a></code>,
52 <code class="directive"><a href="./mod/mod_mime.html#addinputfilter">AddInputFilter</a></code>,
53 <code class="directive"><a href="./mod/mod_mime.html#addoutputfilter">AddOutputFilter</a></code>,
54 <code class="directive"><a href="./mod/mod_mime.html#removeinputfilter">RemoveInputFilter</a></code>, and
55 <code class="directive"><a href="./mod/mod_mime.html#removeoutputfilter">RemoveOutputFilter</a></code>
58 <p>The following user-selectable filters are currently provided
59 with the Apache HTTP Server distribution.</p>
63 <dd>Server-Side Includes processing by <code class="module"><a href="./mod/mod_include.html">mod_include</a></code></dd>
65 <dd>Compress output before sending it to the client using
66 <code class="module"><a href="./mod/mod_deflate.html">mod_deflate</a></code>
70 <p>In addition, the module <code class="module"><a href="./mod/mod_ext_filter.html">mod_ext_filter</a></code> allows
71 for external programs to be defined as filters.</p>
73 <div class="bottomlang">
74 <p><span>Available Languages: </span><a href="./en/filter.html" title="English"> en </a> |
75 <a href="./es/filter.html" hreflang="es" rel="alternate" title="Español"> es </a> |
76 <a href="./fr/filter.html" hreflang="fr" rel="alternate" title="Français"> fr </a> |
77 <a href="./ja/filter.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
78 <a href="./ko/filter.html" hreflang="ko" rel="alternate" title="Korean"> ko </a> |
79 <a href="./ru/filter.html" hreflang="ru" rel="alternate" title="Russian"> ru </a> |
80 <a href="./tr/filter.html" hreflang="tr" rel="alternate" title="Türkçe"> tr </a></p>
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82 <p class="apache">Copyright 2009 The Apache Software Foundation.<br />Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p>
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