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59 lines
2.0 KiB
HTML
59 lines
2.0 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<HTML>
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<HEAD>
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<TITLE>Filters - Apache HTTPD</TITLE>
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</HEAD>
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<!-- Background white, links blue (unvisited), navy (visited), red (active) -->
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<BODY
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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LINK="#0000FF"
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VLINK="#000080"
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ALINK="#FF0000"
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>
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<!--#include virtual="header.html" -->
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<H1 ALIGN="CENTER">Filters</H1>
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<table border="1">
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<tr><td valign="top">
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<strong>Related Modules</strong><br><br>
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<a href="mod/mod_ext_filter.html">mod_ext_filter</a><br>
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<A HREF="mod/mod_include.html">mod_include</A><br>
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</td>
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<td valign="top">
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<strong>Related Directives</strong><br><br>
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<a href="mod/mod_ext_filter.html#extfilterdefine">ExtFilterDefine</a></br>
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<a href="mod/mod_ext_filter.html#extfilteroptions">ExtFilterOptions</a><br>
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<a href="mod/core.html#setinputfilter">SetInputFilter</a><br>
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<a href="mod/core.html#setoutputfilter">SetOutputFilter</a><br>
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</td>
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</tr></table>
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<p>A <em>filter</em> is a process which is applied to data that is
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sent or received by the server. Data sent by clients to the server
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is processed by <em>input filters</em> while data sent by the
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server to the client is processed by <em>output filters</em>.
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Multiple filters can be applied to the data, and the order
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of the filters can be explicitly specified.</p>
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<p>Filters are used internally by Apache to perform functions such as
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chunking and byte-range request handling. In addition, modules can
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provide filters which are selectable using run-time configuration
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directives. The set of filters which apply to data can be manipulated
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with the <code>SetInputFilter</code> and <code>SetOutputFilter</code>
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directives.</p>
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<p>The only configurable filter currently included with the Apache
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distribution is the <code>INCLUDES</code> filter which is provided by
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<a href="mod/mod_include.html">mod_include</a> to process output for
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Server Side Includes. There is also an experimental module called <a
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href="mod/mod_ext_filter.html">mod_ext_filter</a> which allows for
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external programs to be defined as filters.</p>
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<!--#include virtual="footer.html" -->
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</BODY>
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</HTML>
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