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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 06:33:50 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 06:33:50 +0000
commitfe39ffb8b90ae4e002ed73fe98617cd590abb467 (patch)
treeb80e5956907d8aeaaffe4e4f0c068c0e6157ce8b /docs/manual/mod/mod_deflate.html.en
parentInitial commit. (diff)
downloadapache2-fe39ffb8b90ae4e002ed73fe98617cd590abb467.tar.xz
apache2-fe39ffb8b90ae4e002ed73fe98617cd590abb467.zip
Adding upstream version 2.4.56.upstream/2.4.56upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+<?xml version="1.0" encoding="UTF-8"?>
+<!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>
+<meta content="text/html; charset=UTF-8" http-equiv="Content-Type" />
+<!--
+ XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
+ This file is generated from xml source: DO NOT EDIT
+ XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
+ -->
+<title>mod_deflate - Apache HTTP Server Version 2.4</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 rel="stylesheet" type="text/css" href="../style/css/prettify.css" />
+<script src="../style/scripts/prettify.min.js" type="text/javascript">
+</script>
+
+<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="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p>
+<p class="apache">Apache HTTP Server Version 2.4</p>
+<img alt="" src="../images/feather.png" /></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/">Documentation</a> &gt; <a href="../">Version 2.4</a> &gt; <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">&nbsp;en&nbsp;</a> |
+<a href="../fr/mod/mod_deflate.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a> |
+<a href="../ja/mod/mod_deflate.html" hreflang="ja" rel="alternate" title="Japanese">&nbsp;ja&nbsp;</a> |
+<a href="../ko/mod/mod_deflate.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</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 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"><a href="https://www.apache.org/foundation/contributing.html" class="badge"><img src="https://www.apache.org/images/SupportApache-small.png" alt="Support Apache!" /></a><h3>Topics</h3>
+<ul id="topics">
+<li><img alt="" src="../images/down.gif" /> <a href="#supportedencodings">Supported Encodings</a></li>
+<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>
+<li><img alt="" src="../images/down.gif" /> <a href="#precompressed">Serving pre-compressed
+content</a></li>
+</ul><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="#deflateinflatelimitrequestbody">DeflateInflateLimitRequestBody</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#deflateinflateratioburst">DeflateInflateRatioBurst</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#deflateinflateratiolimit">DeflateInflateRatioLimit</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>Bugfix checklist</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">httpd changelog</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&amp;list_id=144532&amp;product=Apache%20httpd-2&amp;query_format=specific&amp;order=changeddate%20DESC%2Cpriority%2Cbug_severity&amp;component=mod_deflate">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&amp;component=mod_deflate">Report a bug</a></li></ul><h3>See also</h3>
+<ul class="seealso">
+<li><a href="../filter.html">Filters</a></li>
+<li><a href="#comments_section">Comments</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="supportedencodings" id="supportedencodings">Supported Encodings</a></h2>
+ <p>The <code>gzip</code> encoding is the only one supported to ensure complete compatibility
+ with old browser implementations. The <code>deflate</code> encoding is not supported,
+ please check the <a href="https://zlib.net/zlib_faq.html#faq39">zlib's documentation</a>
+ for a complete explanation.
+ </p>
+</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>
+ <div class="warning"><h3>Compression and TLS</h3>
+ <p>Some web applications are vulnerable to an information disclosure
+ attack when a TLS connection carries deflate compressed data. For more
+ information, review the details of the "BREACH" family of attacks.</p>
+ </div>
+ <p>This is a simple configuration that compresses common text-based content types.</p>
+
+ <div class="example"><h3>Compress only a few types</h3><pre class="prettyprint lang-config">AddOutputFilterByType DEFLATE text/html text/plain text/xml text/css text/javascript application/javascript</pre>
+</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>
+ <div class="warning"><h3>Compression and TLS</h3>
+ <p>Some web applications are vulnerable to an information disclosure
+ attack when a TLS connection carries deflate compressed data. For more
+ information, review the details of the "BREACH" family of attacks.</p>
+ </div>
+
+ <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>
+
+ <pre class="prettyprint lang-config">SetOutputFilter DEFLATE
+SetEnvIfNoCase Request_URI "\.(?:gif|jpe?g|png)$" no-gzip</pre>
+
+
+ <p>If you want to restrict the compression to particular MIME types
+ in general, you may use the <code class="directive"><a href="../mod/mod_filter.html#addoutputfilterbytype">AddOutputFilterByType</a></code> directive. Here is an example of
+ enabling compression only for the html files of the Apache
+ documentation:</p>
+
+ <pre class="prettyprint lang-config">&lt;Directory "/your-server-root/manual"&gt;
+ AddOutputFilterByType DEFLATE text/html
+&lt;/Directory&gt;</pre>
+
+
+ <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>
+ <div class="note"><h3>Note</h3>
+ There is an environment variable <code>force-gzip</code>,
+ set via <code class="directive"><a href="../mod/mod_env.html#setenv">SetEnv</a></code>, which
+ will ignore the accept-encoding setting of your browser and will
+ send compressed output.
+ </div>
+
+
+ <h3><a name="inflate" id="inflate">Output Decompression</a></h3>
+ <p>The <code class="module"><a href="../mod/mod_deflate.html">mod_deflate</a></code> module also provides a filter for
+ inflating/uncompressing a gzip compressed response body. In order to activate
+ this feature you have to insert the <code>INFLATE</code> filter into
+ the output filter chain using <code class="directive"><a href="../mod/core.html#setoutputfilter">SetOutputFilter</a></code> or <code class="directive"><a href="../mod/mod_mime.html#addoutputfilter">AddOutputFilter</a></code>, for example:</p>
+
+ <pre class="prettyprint lang-config">&lt;Location "/dav-area"&gt;
+ ProxyPass "http://example.com/"
+ SetOutputFilter INFLATE
+&lt;/Location&gt;</pre>
+
+
+ <p>This Example will uncompress gzip'ed output from example.com, so other
+ filters can do further processing with it.
+ </p>
+
+
+ <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>
+
+ <pre class="prettyprint lang-config">&lt;Location "/dav-area"&gt;
+ SetInputFilter DEFLATE
+&lt;/Location&gt;</pre>
+
+
+ <p>Now if a request contains a <code>Content-Encoding:
+ gzip</code> header, the body will be automatically decompressed.
+ Few browsers have the ability to gzip request bodies. However,
+ some special applications actually do support request
+ compression, for instance some <a href="http://www.webdav.org">WebDAV</a> clients.</p>
+
+ <div class="warning"><h3>Note on Content-Length</h3>
+ <p>If you evaluate the request body yourself, <em>don't trust
+ the <code>Content-Length</code> header!</em>
+ The Content-Length header reflects the length of the
+ incoming data from the client and <em>not</em> the byte count of
+ the decompressed data stream.</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="proxies" id="proxies">Dealing with proxy servers</a></h2>
+
+ <p>The <code class="module"><a href="../mod/mod_deflate.html">mod_deflate</a></code> module sends a <code>Vary:
+ Accept-Encoding</code> HTTP response header to alert proxies that
+ a cached response should be sent only to clients that send the
+ appropriate <code>Accept-Encoding</code> request header. This
+ prevents compressed content from being sent to a client that will
+ not understand it.</p>
+
+ <p>If you use some special exclusions dependent
+ on, for example, the <code>User-Agent</code> header, you must
+ manually configure an addition to the <code>Vary</code> header
+ to alert proxies of the additional restrictions. For example,
+ in a typical configuration where the addition of the <code>DEFLATE</code>
+ filter depends on the <code>User-Agent</code>, you should add:</p>
+
+ <pre class="prettyprint lang-config">Header append Vary User-Agent</pre>
+
+
+ <p>If your decision about compression depends on other information
+ than request headers (<em>e.g.</em> HTTP version), you have to set the
+ <code>Vary</code> header to the value <code>*</code>. This prevents
+ compliant proxies from caching entirely.</p>
+
+ <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">Header set Vary *</pre>
+</div>
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="precompressed" id="precompressed">Serving pre-compressed
+content</a></h2>
+
+ <p>Since <code class="module"><a href="../mod/mod_deflate.html">mod_deflate</a></code> re-compresses content each
+ time a request is made, some performance benefit can be derived by
+ pre-compressing the content and telling <code class="module"><a href="../mod/mod_deflate.html">mod_deflate</a></code> to serve them
+ without re-compressing them. This may be accomplished using a
+ configuration like the following:</p>
+
+ <pre class="prettyprint lang-config">&lt;IfModule mod_headers.c&gt;
+ # Serve gzip compressed CSS and JS files if they exist
+ # and the client accepts gzip.
+ RewriteCond "%{HTTP:Accept-encoding}" "gzip"
+ RewriteCond "%{REQUEST_FILENAME}\.gz" -s
+ RewriteRule "^(.*)\.(css|js)" "$1\.$2\.gz" [QSA]
+
+ # Serve correct content types, and prevent mod_deflate double gzip.
+ RewriteRule "\.css\.gz$" "-" [T=text/css,E=no-gzip:1]
+ RewriteRule "\.js\.gz$" "-" [T=text/javascript,E=no-gzip:1]
+
+
+ &lt;FilesMatch "(\.js\.gz|\.css\.gz)$"&gt;
+ # Serve correct encoding type.
+ Header append Content-Encoding gzip
+
+ # Force proxies to cache gzipped &amp;
+ # non-gzipped css/js files separately.
+ Header append Vary Accept-Encoding
+ &lt;/FilesMatch&gt;
+&lt;/IfModule&gt;</pre>
+
+
+</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><code>DeflateBufferSize <var>value</var></code></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. If the compressed response size is bigger than the one specified
+ by this directive then httpd will switch to chunked encoding
+ (HTTP header <code>Transfer-Encoding</code> set to <code>Chunked</code>), with the
+ side effect of not setting any <code>Content-Length</code> HTTP header. This is particularly
+ important when httpd works behind reverse caching proxies or when httpd is configured with
+ <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> and <code class="module"><a href="../mod/mod_cache_disk.html">mod_cache_disk</a></code> because
+ HTTP responses without any <code>Content-Length</code> header might not be cached.
+ </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="DeflateCompressionLevel" id="DeflateCompressionLevel">DeflateCompressionLevel</a> <a name="deflatecompressionlevel" id="deflatecompressionlevel">Directive</a></h2>
+<table class="directive">
+<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>How much compression do we apply to the output</td></tr>
+<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>DeflateCompressionLevel <var>value</var></code></td></tr>
+<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>Zlib's default</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">DeflateCompressionLevel</code> directive specifies
+ what level of compression should be used, the higher the value,
+ the better the compression, but the more CPU time is required to
+ achieve this.</p>
+ <p>The value must between 1 (less compression) and 9 (more compression).</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><code>DeflateFilterNote [<var>type</var>] <var>notename</var></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">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. You can use that note for statistical purposes by
+ adding the value to your <a href="../logs.html#accesslog">access log</a>.</p>
+
+ <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">DeflateFilterNote ratio
+
+LogFormat '"%r" %b (%{ratio}n) "%{User-agent}i"' deflate
+CustomLog "logs/deflate_log" deflate</pre>
+</div>
+
+ <p>If you want to extract more accurate values from your logs, you
+ can use the <var>type</var> argument to specify the type of data
+ left as a note for logging. <var>type</var> can be one of:</p>
+
+ <dl>
+ <dt><code>Input</code></dt>
+ <dd>Store the byte count of the filter's input stream in the note.</dd>
+
+ <dt><code>Output</code></dt>
+ <dd>Store the byte count of the filter's output stream in the note.</dd>
+
+ <dt><code>Ratio</code></dt>
+ <dd>Store the compression ratio (<code>output/input * 100</code>)
+ in the note. This is the default, if the <var>type</var> argument
+ is omitted.</dd>
+ </dl>
+
+ <p>Thus you may log it this way:</p>
+
+ <div class="example"><h3>Accurate Logging</h3><pre class="prettyprint lang-config">DeflateFilterNote Input instream
+DeflateFilterNote Output outstream
+DeflateFilterNote Ratio ratio
+
+LogFormat '"%r" %{outstream}n/%{instream}n (%{ratio}n%%)' deflate
+CustomLog "logs/deflate_log" deflate</pre>
+</div>
+
+<h3>See also</h3>
+<ul>
+<li><code class="module"><a href="../mod/mod_log_config.html">mod_log_config</a></code></li>
+</ul>
+</div>
+<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="directive-section"><h2><a name="DeflateInflateLimitRequestBody" id="DeflateInflateLimitRequestBody">DeflateInflateLimitRequestBody</a> <a name="deflateinflatelimitrequestbody" id="deflateinflatelimitrequestbody">Directive</a></h2>
+<table class="directive">
+<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maximum size of inflated request bodies</td></tr>
+<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>DeflateInflateLimitRequestBody <var>value</var></code></td></tr>
+<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>None, but LimitRequestBody applies after deflation</code></td></tr>
+<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</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>
+<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>2.4.10 and later</td></tr>
+</table>
+ <p>The <code class="directive">DeflateInflateLimitRequestBody</code> directive
+ specifies the maximum size of an inflated request body. If it is unset,
+ <code class="directive"><a href="../mod/core.html#limitrequestbody">LimitRequestBody</a></code> is applied to the
+ inflated body.</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="DeflateInflateRatioBurst" id="DeflateInflateRatioBurst">DeflateInflateRatioBurst</a> <a name="deflateinflateratioburst" id="deflateinflateratioburst">Directive</a></h2>
+<table class="directive">
+<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maximum number of times the inflation ratio for request bodies
+ can be crossed</td></tr>
+<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>DeflateInflateRatioBurst <var>value</var></code></td></tr>
+<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>DeflateInflateRatioBurst 3</code></td></tr>
+<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</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>
+<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>2.4.10 and later</td></tr>
+</table>
+ <p>The <code class="directive">DeflateInflateRatioBurst</code> directive
+ specifies the maximum number of times the
+ <code class="directive"><a href="#deflateinflateratiolimit">DeflateInflateRatioLimit</a></code> can
+ be crossed before terminating the request.</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="DeflateInflateRatioLimit" id="DeflateInflateRatioLimit">DeflateInflateRatioLimit</a> <a name="deflateinflateratiolimit" id="deflateinflateratiolimit">Directive</a></h2>
+<table class="directive">
+<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maximum inflation ratio for request bodies</td></tr>
+<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>DeflateInflateRatioLimit <var>value</var></code></td></tr>
+<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>DeflateInflateRatioLimit 200</code></td></tr>
+<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</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>
+<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>2.4.10 and later</td></tr>
+</table>
+ <p>The <code class="directive">DeflateInflateRatioLimit</code> directive
+ specifies the maximum ratio of deflated to inflated size of an
+ inflated request body. This ratio is checked as the body is
+ streamed in, and if crossed more than
+ <code class="directive"><a href="#deflateinflateratioburst">DeflateInflateRatioBurst</a></code>
+ times, the request will be terminated.</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><code>DeflateMemLevel <var>value</var></code></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><code>DeflateWindowSize <var>value</var></code></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). Generally, the
+ higher the window size, the higher can the compression ratio be expected.</p>
+
+</div>
+</div>
+<div class="bottomlang">
+<p><span>Available Languages: </span><a href="../en/mod/mod_deflate.html" title="English">&nbsp;en&nbsp;</a> |
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