granicus.if.org Git - apache/blob - docs/manual/filter.html.en

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   8     <title>Filters - Apache HTTPD</title>
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  16     <h1 align="CENTER">Filters</h1>
  17
  18     <table border="1">
  19       <tr>
  20         <td valign="top"><strong>Related Modules</strong><br />
  21          <br />
  22          <a href="mod/mod_deflate.html">mod_deflate</a><br />
  23          <a href="mod/mod_ext_filter.html">mod_ext_filter</a><br />
  24          <a href="mod/mod_include.html">mod_include</a><br />
  25          </td>
  26
  27         <td valign="top"><strong>Related Directives</strong><br />
  28          <br />
  29          <a
  30         href="mod/mod_mime.html#addinputfilter">AddInputFilter</a><br />
  31          <a
  32         href="mod/mod_mime.html#addoutputfilter">AddOutputFilter</a><br />
  33          <a
  34         href="mod/mod_ext_filter.html#extfilterdefine">ExtFilterDefine</a><br />
  35          <a
  36         href="mod/mod_ext_filter.html#extfilteroptions">ExtFilterOptions</a><br />
  37          <a
  38         href="mod/core.html#setinputfilter">SetInputFilter</a><br />
  39          <a
  40         href="mod/core.html#setoutputfilter">SetOutputFilter</a><br />
  41          </td>
  42       </tr>
  43     </table>
  44
  45     <p>A <em>filter</em> is a process that is applied to data that
  46     is sent or received by the server. Data sent by clients to the
  47     server is processed by <em>input filters</em> while data sent
  48     by the server to the client is processed by <em>output
  49     filters</em>. Multiple filters can be applied to the data, and
  50     the order of the filters can be explicitly specified.</p>
  51
  52     <p>Filters are used internally by Apache to perform functions such
  53     as chunking and byte-range request handling. In addition, modules
  54     can provide filters that are selectable using run-time
  55     configuration directives. The set of filters that apply to data
  56     can be manipulated with the <code>SetInputFilter</code>,
  57     <code>SetOutputFilter</code>, <code>AddInputFilter</code>, and
  58     <code>AddOutputFilter</code> directives.</p>
  59
  60     <p>The following user-selectable filters are currently provided
  61     with the Apache HTTP Server distribution.</p>
  62
  63 <dl>
  64 <dt>INCLUDES</dt> <dd>Server-Side Includes processing by <a
  65 href="mod/mod_include.html">mod_include</a></dd>
  66 <dt>DEFLATE</dt> <dd>Compress output before sending it to
  67 the client using <a href="mod/mod_deflate.html">mod_deflate</a></dd>
  68 </dl>
  69
  70     <p>In addition, the module <a
  71     href="mod/mod_ext_filter.html">mod_ext_filter</a> allows
  72     for external programs to be defined as filters.</p>
  73
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