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<?xml version="1.0" encoding="ISO-8859-1"?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><!-- XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX This file is generated from xml source: DO NOT EDIT XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX --><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="<-" alt="<-" src="../images/left.gif" /></a></div><div id="path"><a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs-project/">Documentation</a> > <a href="../">Version 2.0</a> > <a href="./">Modules</a></div><div id="page-content"><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></div><table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Compress content before it is delivered to theclient</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">⌨️ 快捷键说明
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