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<title>mod_deflate - Apache HTTP Server</title>
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<div id="preamble"><h1>Apache Module mod_deflate</h1>
<div class="toplang">
<p><span>Available Languages: </span><a href="../en/mod/mod_deflate.html" title="English"> en </a> |
<a href="../ja/mod/mod_deflate.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
<a href="../ko/mod/mod_deflate.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p>
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<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營dentifier:</a></th><td>deflate_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">Source燜ile:</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="#deflatecompressionlevel">DeflateCompressionLevel</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" /> <a href="#recommended">Sample Configurations</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#enable">Enabling Compression</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#proxies">Dealing with proxy servers</a></li>
</ul><h3>See also</h3>
<ul class="seealso">
<li><a href="../filter.html">Filters</a></li>
</ul></div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="recommended" id="recommended">Sample Configurations</a></h2>
<p>This is a simple sample configuration for the impatient.</p>
<div class="example"><h3>Compress only a few types</h3><p><code>
AddOutputFilterByType DEFLATE text/html text/plain text/xml
</code></p></div>
<p>The following configuration, while resulting in more compressed content,
is also much more complicated. Do not use this unless you fully understand
all the configuration details.</p>
<div class="example"><h3>Compress everything except images</h3><p><code>
<Location /><br />
<span class="indent">
# Insert filter<br />
SetOutputFilter DEFLATE<br />
<br />
# Netscape 4.x has some problems...<br />
BrowserMatch ^Mozilla/4 gzip-only-text/html<br />
<br />
# Netscape 4.06-4.08 have some more problems<br />
BrowserMatch ^Mozilla/4\.0[678] no-gzip<br />
<br />
# MSIE masquerades as Netscape, but it is fine<br />
# BrowserMatch \bMSIE !no-gzip !gzip-only-text/html<br />
<br />
# NOTE: Due to a bug in mod_setenvif up to Apache 2.0.48<br />
# the above regex won't work. You can use the following<br />
# workaround to get the desired effect:<br />
BrowserMatch \bMSI[E] !no-gzip !gzip-only-text/html<br />
<br />
# Don't compress images<br />
SetEnvIfNoCase Request_URI \<br />
<span class="indent">
\.(?:gif|jpe?g|png)$ no-gzip dont-vary<br />
</span>
<br />
# Make sure proxies don't deliver the wrong content<br />
Header append Vary User-Agent env=!dont-vary<br />
</span>
</Location>
</code></p></div>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="enable" id="enable">Enabling Compression</a></h2>
<h3><a name="output" id="output">Output Compression</a></h3>
<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>
<div class="example"><p><code>
SetOutputFilter DEFLATE
</code></p></div>
<p>Some popular browsers cannot handle compression of all content
so you may want to set the <code>gzip-only-text/html</code> note to
<code>1</code> to only allow html files to be compressed (see
below). If you set this to <em>anything but <code>1</code></em> it
will be ignored.</p>
<p>If you want to restrict the compression to particular MIME types
in general, you may use the <code class="directive"><a href="../mod/core.html#addoutputfilterbytype">AddOutputFilterByType</a></code> directive. Here is an example of
enabling compression only for the html files of the Apache
documentation:</p>
<div class="example"><p><code>
<Directory "/your-server-root/manual"><br />
<span class="indent">
AddOutputFilterByType DEFLATE text/html<br />
</span>
</Directory>
</code></p></div>
<p>For browsers that have problems even with compression of all file
types, use the <code class="directive"><a href="../mod/mod_setenvif.html#browsermatch">BrowserMatch</a></code> directive to set the <code>no-gzip</code>
note for that particular browser so that no compression will be
performed. You may combine <code>no-gzip</code> with <code>gzip-only-text/html</code> to get the best results. In that case
the former overrides the latter. Take a look at the following
excerpt from the <a href="#recommended">configuration example</a>
defined in the section above:</p>
<div class="example"><p><code>
BrowserMatch ^Mozilla/4 gzip-only-text/html<br />
BrowserMatch ^Mozilla/4\.0[678] no-gzip<br />
BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
</code></p></div>
<p>At first we probe for a <code>User-Agent</code> string that
indicates a Netscape Navigator version of 4.x. These versions
cannot handle compression of types other than
<code>text/html</code>. The versions 4.06, 4.07 and 4.08 also
have problems with decompressing html files. Thus, we completely
turn off the deflate filter for them.</p>
<p>The third <code class="directive"><a href="../mod/mod_setenvif.html#browsermatch">BrowserMatch</a></code>
directive fixes the guessed identity of the user agent, because
the Microsoft Internet Explorer identifies itself also as "Mozilla/4"
but is actually able to handle requested compression. Therefore we
match against the additional string "MSIE" (<code>\b</code> means
"word boundary") in the <code>User-Agent</code> Header and turn off
the restrictions defined before.</p>
<div class="note"><h3>Note</h3>
The <code>DEFLATE</code> filter is always inserted after RESOURCE
filters like PHP or SSI. It never touches internal subrequests.
</div>
<h3><a name="input" id="input">Input Decompression</a></h3>
<p>The <code class="module"><a href="../mod/mod_deflate.html">mod_deflate</a></code> module also provides a filter for
decompressing a gzip compressed request body . In order to activate
this feature you have to insert the <code>DEFLATE</code> filter into
the input filter chain using <code class="directive"><a href="../mod/core.html#setinputfilter">SetInputFilter</a></code> or <code class="directive"><a href="../mod/mod_mime.html#addinputfilter">AddInputFilter</a></code>, for example:</p>
<div class="example"><p><code>
<Location /dav-area><br />
<span class="indent">
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