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<?xml version="1.0" encoding="ISO-8859-1"?>
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<title>Filters - Apache HTTP Server</title>
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<p class="apache">Apache HTTP Server Version 2.0</p>
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<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 class="retired"><h4>Please note</h4>
<p>This document refers to the <strong>2.0</strong> version of Apache httpd, which <strong>is no longer maintained</strong>. Upgrade, and refer to the current version of httpd instead, documented at:</p>
<ul><li><a href="http://httpd.apache.org/docs/current/">Current release version of Apache HTTP Server documentation</a></li></ul><p>You may follow <a href="http://httpd.apache.org/docs/current/filter.html">this link</a> to go to the current version of this document.</p></div><div id="preamble"><h1>Filters</h1>
<div class="toplang">
<p><span>Available Languages: </span><a href="./en/filter.html" title="English"> en </a> |
<a href="./es/filter.html" hreflang="es" rel="alternate" title="Español"> es </a> |
<a href="./fr/filter.html" hreflang="fr" rel="alternate" title="Français"> fr </a> |
<a href="./ja/filter.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
<a href="./ko/filter.html" hreflang="ko" rel="alternate" title="Korean"> ko </a> |
<a href="./ru/filter.html" hreflang="ru" rel="alternate" title="Russian"> ru </a> |
<a href="./tr/filter.html" hreflang="tr" rel="alternate" title="Türkçe"> tr </a></p>
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<p>This document describes the use of filters in Apache.</p>
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<div class="section">
<h2><a name="filters" id="filters">Filters</a></h2>
<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>
<p>A <em>filter</em> is a process that is applied to data that
is sent or received by the server. Data sent by clients to the
server is processed by <em>input filters</em> while data sent
by the server to the client is processed by <em>output
filters</em>. Multiple filters can be applied to the data, and
the order of the filters can be explicitly specified.</p>
<p>Filters are used internally by Apache to perform functions such
as chunking and byte-range request handling. In addition, modules
can provide filters that are selectable using run-time
configuration directives. The set of filters that apply to data
can be manipulated with the
<code class="directive"><a href="./mod/core.html#setinputfilter">SetInputFilter</a></code>,
<code class="directive"><a href="./mod/core.html#setoutputfilter">SetOutputFilter</a></code>,
<code class="directive"><a href="./mod/mod_mime.html#addinputfilter">AddInputFilter</a></code>,
<code class="directive"><a href="./mod/mod_mime.html#addoutputfilter">AddOutputFilter</a></code>,
<code class="directive"><a href="./mod/mod_mime.html#removeinputfilter">RemoveInputFilter</a></code>, and
<code class="directive"><a href="./mod/mod_mime.html#removeoutputfilter">RemoveOutputFilter</a></code>
directives.</p>
<p>The following user-selectable filters are currently provided
with the Apache HTTP Server distribution.</p>
<dl>
<dt>INCLUDES</dt>
<dd>Server-Side Includes processing by <code class="module"><a href="./mod/mod_include.html">mod_include</a></code></dd>
<dt>DEFLATE</dt>
<dd>Compress output before sending it to the client using
<code class="module"><a href="./mod/mod_deflate.html">mod_deflate</a></code>
</dd>
</dl>
<p>In addition, the module <code class="module"><a href="./mod/mod_ext_filter.html">mod_ext_filter</a></code> allows
for external programs to be defined as filters.</p>
</div></div>
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<p><span>Available Languages: </span><a href="./en/filter.html" title="English"> en </a> |
<a href="./es/filter.html" hreflang="es" rel="alternate" title="Español"> es </a> |
<a href="./fr/filter.html" hreflang="fr" rel="alternate" title="Français"> fr </a> |
<a href="./ja/filter.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
<a href="./ko/filter.html" hreflang="ko" rel="alternate" title="Korean"> ko </a> |
<a href="./ru/filter.html" hreflang="ru" rel="alternate" title="Russian"> ru </a> |
<a href="./tr/filter.html" hreflang="tr" rel="alternate" title="Türkçe"> tr </a></p>
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<p class="apache">Copyright 2013 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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