filter.html.en revision 36488004520b3a22fbd37ef8e10e5641be154ac1
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
This file is generated from xml source: DO NOT EDIT
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
--><title>Filters- Apache HTTP Server</title><link href="/style/manual.css" type="text/css" rel="stylesheet"/></head><body><blockquote><div align="center"><img src="/images/sub.gif" alt="[APACHE DOCUMENTATION]"/><h3>Apache HTTP Server Version 2.0</h3></div><h1 align="center">Filters</h1>
<p>This document describes the use of filters in Apache.</p>
<ul><li><a href="#filters">Filters</a></li></ul><hr/><h2><a name="filters">Filters</a></h2>
<table border="1"><tr><td valign="top"><strong>Related Modules</strong><br/><br/><code><a href="/mod/mod_deflate.html">mod_deflate</a></code>, <br/><code><a href="/mod/mod_ext_filter.html">mod_ext_filter</a></code>, <br/><code><a href="/mod/mod_include.html">mod_include</a></code><br/></td><td valign="top"><strong>Related Directives</strong><br/><br/><a href="/mod/mod_mime.html#addinputfilter" class="directive"><code class="directive">AddInputFilter</code></a><br/><a href="/mod/mod_mime.html#addoutputfilter" class="directive"><code class="directive">AddOutputFilter</code></a><br/><a href="/mod/mod_ext_filter.html#extfilterdefine" class="directive"><code class="directive">ExtFilterDefine</code></a><br/><a href="/mod/mod_ext_filter.html#extfilteroptions" class="directive"><code class="directive">ExtFilterOptions</code></a><br/><a href="/mod/core.html.html#setinputfilter" class="directive"><code class="directive">SetInputFilter</code></a><br/><a href="/mod/core.html.html#setoutputfilter" class="directive"><code class="directive">SetOutputFilter</code></a><br/></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 <a href="/mod/core.html.html#setinputfilter" class="directive"><code class="directive">SetInputFilter</code></a>, <a href="/mod/core.html.html#setoutputfilter" class="directive"><code class="directive">SetOutputFilter</code></a>, <a href="/mod/mod_mime.html#addinputfilter" class="directive"><code class="directive">AddInputFilter</code></a>, and <a href="/mod/mod_mime.html#addoutputfilter" class="directive"><code class="directive">AddOutputFilter</code></a> 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><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><a href="/mod/mod_include.html">mod_include</a></code></dd>
</dl>
<p>In addition, the module <code><a href="/mod/mod_ext_filter.html">mod_ext_filter</a></code> allows
for external programs to be defined as filters.</p>
