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--><title>mod_deflate - Apache HTTP Server</title><link rel="stylesheet" type="text/css" href="/style/manual.css"/></head><body><blockquote><div align="center"><img src="/images/sub.gif" alt="[APACHE DOCUMENTATION]"/><h3>Apache HTTP Server Version 2.0</h3></div><h1 align="center">Apache Module mod_deflate</h1><table bgcolor="#cccccc" cellpadding="0" cellspacing="1"><tr><td><table bgcolor="#ffffff"><tr><td valign="top"><span class="help">Description:</span></td><td>Compress content before
it is delivered to the client</td></tr><tr><td><a class="help" href="module-dict.html#Status">Status:</a></td><td>experimental</td></tr><tr><td><a class="help" href="module-dict.html#ModuleIdentifier">Module Identifier:</a></td><td>deflate_module</td></tr></table></td></tr></table><h2>Summary</h2>
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>
<h2>Directives</h2><ul><li><a href="#deflatefilternote">DeflateFilterNote</a></li><li><a href="#deflatememlevel">DeflateMemLevel</a></li><li><a href="#deflatewindowsize">DeflateWindowSize</a></li></ul><p><strong>See also </strong></p><ul><li><a class="directive" href="mod_mime.html#addoutputfilter"><code class="directive">AddOutputFilter</code></a></li><li><a class="directive" href="core.html#setoutputfilter"><code class="directive">SetOutputFilter</code></a></li></ul><h2>Enabling Compression</h2>
<p>Compression is implemented by the <code>DEFLATE</code>
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 enable the 'gzip-only-text/html' note (see below)
</strong></p>
<blockquote><table cellpadding="10"><tr><td bgcolor="#eeeeee"><code>SetEnv gzip-only-text/html 1<br/>
SetOutputFilter DEFLATE
</code></td></tr></table></blockquote>
<p>Here is an example of enabling compression for the Apache
documentation:</p>
<blockquote><table cellpadding="10"><tr><td bgcolor="#eeeeee"><code>
SetOutputFilter DEFLATE<br/>
</Directory>
</code></td></tr></table></blockquote>
<hr/><h2><a name="DeflateFilterNote">DeflateFilterNote</a> <a name="deflatefilternote">Directive</a></h2><table bgcolor="#cccccc" border="0" cellspacing="0" cellpadding="1"><tr><td><table bgcolor="#ffffff"><tr><td><strong>Description: </strong></td><td>Places the compression ratio in a note for logging</td></tr><tr><td><a class="help" href="directive-dict.html#Syntax">Syntax:</a></td><td>DeflateFilterNote <em>notename</em></td></tr><tr><td><a class="help" href="directive-dict.html#Context">Context:</a></td><td>server config</td></tr><tr><td><a class="help" href="directive-dict.html#Status">Status:</a></td><td>experimental</td></tr><tr><td><a class="help" href="directive-dict.html#Module">Module:</a></td><td>mod_deflate</td></tr></table></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>
<hr/><h2><a name="DeflateMemLevel">DeflateMemLevel</a> <a name="deflatememlevel">Directive</a></h2><table bgcolor="#cccccc" border="0" cellspacing="0" cellpadding="1"><tr><td><table bgcolor="#ffffff"><tr><td><strong>Description: </strong></td><td>Amount of memory available to zlib for compression</td></tr><tr><td><a class="help" href="directive-dict.html#Syntax">Syntax:</a></td><td>DeflateMemLevel <em>value</em></td></tr><tr><td><a class="help" href="directive-dict.html#Context">Context:</a></td><td>server config</td></tr><tr><td><a class="help" href="directive-dict.html#Status">Status:</a></td><td>experimental</td></tr><tr><td><a class="help" href="directive-dict.html#Module">Module:</a></td><td>mod_deflate</td></tr></table></td></tr></table>
<p>The <code class="directive">DeflateMemLevel</code> directive specifies
the amount of memory available to zlib for compression.</p>
<hr/><h2><a name="DeflateWindowSize">DeflateWindowSize</a> <a name="deflatewindowsize">Directive</a></h2><table bgcolor="#cccccc" border="0" cellspacing="0" cellpadding="1"><tr><td><table bgcolor="#ffffff"><tr><td><strong>Description: </strong></td><td>Zlib compression window size</td></tr><tr><td><a class="help" href="directive-dict.html#Syntax">Syntax:</a></td><td>DeflateWindowSize <em>value</em></td></tr><tr><td><a class="help" href="directive-dict.html#Context">Context:</a></td><td>server config</td></tr><tr><td><a class="help" href="directive-dict.html#Status">Status:</a></td><td>experimental</td></tr><tr><td><a class="help" href="directive-dict.html#Module">Module:</a></td><td>mod_deflate</td></tr></table></td></tr></table>
<p>The <code class="directive">DeflateWindowSize</code> directive specifies the
zlib compression window size.</p>
