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| <title>Filters - Apache HTTPD</title> |
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| <h1 align="CENTER">Filters</h1> |
| |
| <table border="1"> |
| <tr> |
| <td valign="top"><strong>Related Modules</strong><br /> |
| <br /> |
| <a href="mod/mod_ext_filter.html">mod_ext_filter</a><br /> |
| <a href="mod/mod_include.html">mod_include</a><br /> |
| </td> |
| |
| <td valign="top"><strong>Related Directives</strong><br /> |
| <br /> |
| <a |
| href="mod/mod_mime.html#addinputfilter">AddInputFilter</a><br /> |
| <a |
| href="mod/mod_mime.html#addoutputfilter">AddOutputFilter</a><br /> |
| <a |
| href="mod/mod_ext_filter.html#extfilterdefine">ExtFilterDefine</a><br /> |
| <a |
| href="mod/mod_ext_filter.html#extfilteroptions">ExtFilterOptions</a><br /> |
| <a |
| href="mod/core.html#setinputfilter">SetInputFilter</a><br /> |
| <a |
| href="mod/core.html#setoutputfilter">SetOutputFilter</a><br /> |
| </td> |
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| |
| <p>A <em>filter</em> is a process which 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 which are selectable using run-time |
| configuration directives. The set of filters which apply to |
| data can be manipulated with the <code>SetInputFilter</code> |
| and <code>SetOutputFilter</code> directives.</p> |
| |
| <p>The only configurable filter currently included with the |
| Apache distribution is the <code>INCLUDES</code> filter which |
| is provided by <a href="mod/mod_include.html">mod_include</a> |
| to process output for Server Side Includes. There is also an |
| experimental module called <a |
| href="mod/mod_ext_filter.html">mod_ext_filter</a> which allows |
| for external programs to be defined as filters.</p> |
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