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<title>Filters - Apache HTTP Server</title>
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<p class="apache">Apache HTTP Server Version 2.1</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-project/">Documentation</a> > <a href="./">Version 2.1</a></div><div id="page-content"><div id="preamble"><h1>Filters</h1>
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<p>This document describes the use of filters in Apache.</p>
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<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/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
</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>
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<p class="apache">Maintained by the <a href="http://httpd.apache.org/docs-project/">Apache HTTP Server Documentation Project</a></p>
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