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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is no longer maintained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> |
| </div> |
| |
| <p>This document describes the use of filters in Apache.</p> |
| </div> |
| <div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div> |
| <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> |
| <div class="bottomlang"> |
| <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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