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<manualpage metafile="filter.xml.meta">
<title>Filters</title>
<summary>
<p>This document describes the use of filters in Apache.</p>
</summary>
<section id="filters">
<title>Filters</title>
<related>
<modulelist>
<module>mod_deflate</module>
<module>mod_ext_filter</module>
<module>mod_include</module>
</modulelist>
<directivelist>
<directive module="mod_mime">AddInputFilter</directive>
<directive module="mod_mime">AddOutputFilter</directive>
<directive module="mod_mime">RemoveInputFilter</directive>
<directive module="mod_mime">RemoveOutputFilter</directive>
<directive module="mod_ext_filter">ExtFilterDefine</directive>
<directive module="mod_ext_filter">ExtFilterOptions</directive>
<directive module="core">SetInputFilter</directive>
<directive module="core">SetOutputFilter</directive>
</directivelist>
</related>
<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
<directive module="core">SetInputFilter</directive>,
<directive module="core">SetOutputFilter</directive>,
<directive module="mod_mime">AddInputFilter</directive>,
<directive module="mod_mime">AddOutputFilter</directive>,
<directive module="mod_mime">RemoveInputFilter</directive>, and
<directive module="mod_mime">RemoveOutputFilter</directive>
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 <module>mod_include</module></dd>
<dt>DEFLATE</dt>
<dd>Compress output before sending it to the client using
<module>mod_deflate</module>
</dd>
</dl>
<p>In addition, the module <module>mod_ext_filter</module> allows
for external programs to be defined as filters.</p>
</section>
</manualpage>
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