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   8 <title>Filters - Apache HTTP Server</title>
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  14 <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>
  15 <p class="apache">Apache HTTP Server Version 2.1</p>
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  19 <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-project/">Documentation</a> &gt; <a href="./">Version 2.1</a></div><div id="page-content"><div id="preamble"><h1>Filters</h1>
  20 <div class="toplang">
  21 <p><span>Available Languages: </span><a href="./en/filter.html" title="English">&nbsp;en&nbsp;</a> |
  22 <a href="./es/filter.html" hreflang="es" rel="alternate" title="Español">&nbsp;es&nbsp;</a> |
  23 <a href="./fr/filter.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a> |
  24 <a href="./ja/filter.html" hreflang="ja" rel="alternate" title="Japanese">&nbsp;ja&nbsp;</a> |
  25 <a href="./ko/filter.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a></p>
  26 </div>
  27
  28     <p>This document describes the use of filters in Apache.</p>
  29   </div>
  30 <div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
  31 <div class="section">
  32 <h2><a name="filters" id="filters">Filters</a></h2>
  33
  34     <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>
  35
  36     <p>A <em>filter</em> is a process that is applied to data that
  37     is sent or received by the server. Data sent by clients to the
  38     server is processed by <em>input filters</em> while data sent
  39     by the server to the client is processed by <em>output
  40     filters</em>. Multiple filters can be applied to the data, and
  41     the order of the filters can be explicitly specified.</p>
  42
  43     <p>Filters are used internally by Apache to perform functions such
  44     as chunking and byte-range request handling. In addition, modules
  45     can provide filters that are selectable using run-time
  46     configuration directives. The set of filters that apply to data
  47     can be manipulated with the
  48     <code class="directive"><a href="./mod/core.html#setinputfilter">SetInputFilter</a></code>,
  49     <code class="directive"><a href="./mod/core.html#setoutputfilter">SetOutputFilter</a></code>,
  50     <code class="directive"><a href="./mod/mod_mime.html#addinputfilter">AddInputFilter</a></code>,
  51     <code class="directive"><a href="./mod/mod_mime.html#addoutputfilter">AddOutputFilter</a></code>,
  52     <code class="directive"><a href="./mod/mod_mime.html#removeinputfilter">RemoveInputFilter</a></code>, and
  53     <code class="directive"><a href="./mod/mod_mime.html#removeoutputfilter">RemoveOutputFilter</a></code>
  54     directives.</p>
  55
  56     <p>The following user-selectable filters are currently provided
  57     with the Apache HTTP Server distribution.</p>
  58
  59     <dl>
  60       <dt>INCLUDES</dt>
  61       <dd>Server-Side Includes processing by <code class="module"><a href="./mod/mod_include.html">mod_include</a></code></dd>
  62       <dt>DEFLATE</dt>
  63       <dd>Compress output before sending it to the client using
  64           <code class="module"><a href="./mod/mod_deflate.html">mod_deflate</a></code>
  65       </dd>
  66     </dl>
  67
  68     <p>In addition, the module <code class="module"><a href="./mod/mod_ext_filter.html">mod_ext_filter</a></code> allows
  69     for external programs to be defined as filters.</p>
  70   </div></div>
  71 <div class="bottomlang">
  72 <p><span>Available Languages: </span><a href="./en/filter.html" title="English">&nbsp;en&nbsp;</a> |
  73 <a href="./es/filter.html" hreflang="es" rel="alternate" title="Español">&nbsp;es&nbsp;</a> |
  74 <a href="./fr/filter.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a> |
  75 <a href="./ja/filter.html" hreflang="ja" rel="alternate" title="Japanese">&nbsp;ja&nbsp;</a> |
  76 <a href="./ko/filter.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a></p>
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  78 <p class="apache">Copyright 1995-2005 The Apache Software Foundation or its licensors, as applicable.<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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