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      --><title>mod_deflate - Apache HTTP Server</title><link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" /><link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" /><link href="../style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /><link href="../images/favicon.ico" rel="shortcut icon" /></head><body><div id="page-header"><p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="../faq/">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p><p class="apache">Apache HTTP Server Version 2.0</p><img alt="" src="../images/feather.gif" /></div><div class="up"><a href="./"><img title="&lt;-" alt="&lt;-" src="../images/left.gif" /></a></div><div id="path"><a href="http://www.apache.org/">Apache</a> &gt; <a href="http://httpd.apache.org/">HTTP Server</a> &gt; <a href="http://httpd.apache.org/docs-project/">Documentation</a> &gt; <a href="../">Version 2.0</a> &gt; <a href="./">Modules</a></div><div id="page-content"><div id="preamble"><h1>Apache Module mod_deflate</h1><table class="module"><tr><th><a href="module-dict.html#Description">Description:
                  </a></th><td>Compress content before
    it is delivered to the client</td></tr><tr><th><a href="module-dict.html#Status">Status:
                  </a></th><td>Extension</td></tr><tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:
                  </a></th><td>deflate_module</td></tr><tr><th><a href="module-dict.html#SourceFile">Source File:
                  </a></th><td>mod_deflate.c</td></tr></table><h3>Summary</h3>
    <p>The <code class="module"><a href="../mod/mod_deflate.html">mod_deflate</a></code> module provides
    the <code>DEFLATE</code> output filter that allows output from
    your server to be compressed before being sent to the client over
    the network.</p>
</div><div id="quickview"><h3 class="directives">Directives</h3><ul id="toc"><li><img alt="" src="../images/down.gif" /> <a href="#deflatebuffersize">DeflateBufferSize</a></li><li><img alt="" src="../images/down.gif" /> <a href="#deflatefilternote">DeflateFilterNote</a></li><li><img alt="" src="../images/down.gif" /> <a href="#deflatememlevel">DeflateMemLevel</a></li><li><img alt="" src="../images/down.gif" /> <a href="#deflatewindowsize">DeflateWindowSize</a></li></ul><h3>Topics</h3><ul id="topics"><li><img alt="" src="../images/down.gif" /> Enabling Compression</li></ul><h3>See also</h3><ul class="seealso"><li><code class="directive"><a href="../mod/mod_mime.html#addoutputfilter">AddOutputFilter</a></code></li><li><code class="directive"><a href="../mod/core.html#setoutputfilter">SetOutputFilter</a></code></li></ul></div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><div class="section"><h2>Enabling Compression</h2>

    <p>Compression is implemented by the <code>DEFLATE</code>
    <a href="../filter.html">filter</a>. The following directive
    will enable compression for documents in the container where it
    is placed:</p>
    <p><strong>Most popular browsers can not handle compression of all content
        so you may want to set the 'gzip-only-text/html' note to 1 to only 
        allow html files to be compressed (see below).</strong></p>
    <p><strong>If you set this to anything but '1' it will be ignored, so you can do
       negative matches.</strong></p>

<div class="example"><p><code>SetEnv gzip-only-text/html 1<br />
SetOutputFilter DEFLATE
</code></p></div>

    <p>Here is an example of enabling compression for the Apache
    documentation:</p>

<div class="example"><p><code>
&lt;Directory "/your-server-root/manual"&gt;<br />
      SetEnv gzip-only-text/html 1<br />
      SetOutputFilter DEFLATE<br />
&lt;/Directory&gt;
</code></p></div>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><div class="directive-section"><h2><a name="DeflateBufferSize" id="DeflateBufferSize">DeflateBufferSize</a> <a name="deflatebuffersize" id="deflatebuffersize">Directive</a></h2><table class="directive"><tr><th><a href="directive-dict.html#Description">Description: 
              </a></th><td>Fragment size to be compressed at one time by zlib</td></tr><tr><th><a href="directive-dict.html#Syntax">Syntax:
              </a></th><td>DeflateBufferSize <em>value</em></td></tr><tr><th><a href="directive-dict.html#Default">Default: 
              </a></th><td><code>DeflateBufferSize 8096</code></td></tr><tr><th><a href="directive-dict.html#Context">Context:
              </a></th><td>server config, virtual host</td></tr><tr><th><a href="directive-dict.html#Status">Status:
              </a></th><td>Extension</td></tr><tr><th><a href="directive-dict.html#Module">Module:
              </a></th><td>mod_deflate</td></tr></table>
    <p>The <code class="directive">DeflateBufferSize</code> directive specifies
    the size in bytes of the fragments that zlib should compress at one
    time.</p>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><div class="directive-section"><h2><a name="DeflateFilterNote" id="DeflateFilterNote">DeflateFilterNote</a> <a name="deflatefilternote" id="deflatefilternote">Directive</a></h2><table class="directive"><tr><th><a href="directive-dict.html#Description">Description: 
              </a></th><td>Places the compression ratio in a note for logging</td></tr><tr><th><a href="directive-dict.html#Syntax">Syntax:
              </a></th><td>DeflateFilterNote <em>notename</em></td></tr><tr><th><a href="directive-dict.html#Context">Context:
              </a></th><td>server config, virtual host</td></tr><tr><th><a href="directive-dict.html#Status">Status:
              </a></th><td>Extension</td></tr><tr><th><a href="directive-dict.html#Module">Module:
              </a></th><td>mod_deflate</td></tr></table>
    <p>The <code class="directive">DeflateFilterNote</code> directive
    specifies that a note about compression ratios should be attached
    to the request. The name of the note is the value specified for
    the directive.</p>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><div class="directive-section"><h2><a name="DeflateMemLevel" id="DeflateMemLevel">DeflateMemLevel</a> <a name="deflatememlevel" id="deflatememlevel">Directive</a></h2><table class="directive"><tr><th><a href="directive-dict.html#Description">Description: 
              </a></th><td>How much memory should be used by zlib for compression</td></tr><tr><th><a href="directive-dict.html#Syntax">Syntax:
              </a></th><td>DeflateMemLevel <em>value</em></td></tr><tr><th><a href="directive-dict.html#Default">Default: 
              </a></th><td><code>DeflateMemLevel 9</code></td></tr><tr><th><a href="directive-dict.html#Context">Context:
              </a></th><td>server config, virtual host</td></tr><tr><th><a href="directive-dict.html#Status">Status:
              </a></th><td>Extension</td></tr><tr><th><a href="directive-dict.html#Module">Module:
              </a></th><td>mod_deflate</td></tr></table>
    <p>The <code class="directive">DeflateMemLevel</code> directive specifies
    how much memory should be used by zlib for compression
    (a value between 1 and 9).</p>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><div class="directive-section"><h2><a name="DeflateWindowSize" id="DeflateWindowSize">DeflateWindowSize</a> <a name="deflatewindowsize" id="deflatewindowsize">Directive</a></h2><table class="directive"><tr><th><a href="directive-dict.html#Description">Description: 
              </a></th><td>Zlib compression window size</td></tr><tr><th><a href="directive-dict.html#Syntax">Syntax:
              </a></th><td>DeflateWindowSize <em>value</em></td></tr><tr><th><a href="directive-dict.html#Default">Default: 
              </a></th><td><code>DeflateWindowSize 15</code></td></tr><tr><th><a href="directive-dict.html#Context">Context:
              </a></th><td>server config, virtual host</td></tr><tr><th><a href="directive-dict.html#Status">Status:
              </a></th><td>Extension</td></tr><tr><th><a href="directive-dict.html#Module">Module:
              </a></th><td>mod_deflate</td></tr></table>
    <p>The <code class="directive">DeflateWindowSize</code> directive specifies the
    zlib compression window size (a value between 1 and 15).</p>
</div></div><div id="footer"><p class="apache">Maintained by the <a href="http://httpd.apache.org/docs-project/">Apache HTTP Server Documentation Project</a></p><p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="../faq/">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p></div></body></html>