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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-07 02:04:06 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-07 02:04:06 +0000 |
| commit | 5dff2d61cc1c27747ee398e04d8e02843aabb1f8 (patch) | |
| tree | a67c336b406c8227bac912beb74a1ad3cdc55100 /docs/manual/mod/mod_deflate.html.en | |
| parent | Initial commit. (diff) | |
| download | apache2-5dff2d61cc1c27747ee398e04d8e02843aabb1f8.tar.xz apache2-5dff2d61cc1c27747ee398e04d8e02843aabb1f8.zip | |
Adding upstream version 2.4.38.upstream/2.4.38
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'docs/manual/mod/mod_deflate.html.en')
| -rw-r--r-- | docs/manual/mod/mod_deflate.html.en | 449 |
1 files changed, 449 insertions, 0 deletions
diff --git a/docs/manual/mod/mod_deflate.html.en b/docs/manual/mod/mod_deflate.html.en new file mode 100644 index 0000000..de2b62c --- /dev/null +++ b/docs/manual/mod/mod_deflate.html.en @@ -0,0 +1,449 @@ +<?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> +<meta content="text/html; charset=ISO-8859-1" 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="<-" 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/">Documentation</a> > <a href="../">Version 2.4</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="../fr/mod/mod_deflate.html" hreflang="fr" rel="alternate" title="Français"> fr </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 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__&list_id=144532&product=Apache%20httpd-2&query_format=specific&order=changeddate%20DESC%2Cpriority%2Cbug_severity&component=mod_deflate">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&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="http://www.gzip.org/zlib/zlib_faq.html#faq38">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"><Directory "/your-server-root/manual"> + AddOutputFilterByType DEFLATE text/html +</Directory></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"><Location "/dav-area"> + ProxyPass "http://example.com/" + SetOutputFilter INFLATE +</Location></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"><Location "/dav-area"> + SetInputFilter DEFLATE +</Location></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 mod_deflate to serve them + without re-compressing them. This may be accomplished using a + configuration like the following:</p> + + <pre class="prettyprint lang-config"><IfModule mod_headers.c> + # Serve gzip compressed CSS files if they exist + # and the client accepts gzip. + RewriteCond "%{HTTP:Accept-encoding}" "gzip" + RewriteCond "%{REQUEST_FILENAME}\.gz" -s + RewriteRule "^(.*)\.css" "$1\.css\.gz" [QSA] + + # Serve gzip compressed JS files if they exist + # and the client accepts gzip. + RewriteCond "%{HTTP:Accept-encoding}" "gzip" + RewriteCond "%{REQUEST_FILENAME}\.gz" -s + RewriteRule "^(.*)\.js" "$1\.js\.gz" [QSA] + + + # Serve correct content types, and prevent mod_deflate double gzip. + RewriteRule "\.css\.gz$" "-" [T=text/css,E=no-gzip:1] + RewriteRule "\.js\.gz$" "-" [T=text/javascript,E=no-gzip:1] + + + <FilesMatch "(\.js\.gz|\.css\.gz)$"> + # Serve correct encoding type. + Header append Content-Encoding gzip + + # Force proxies to cache gzipped & + # non-gzipped css/js files separately. + Header append Vary Accept-Encoding + </FilesMatch> +</IfModule></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>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">DeflateInflateRatioLimit</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>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">DeflateInflateRatioBurst</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"> en </a> | +<a href="../fr/mod/mod_deflate.html" hreflang="fr" rel="alternate" title="Français"> fr </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><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed again by our moderators if they are either implemented or considered invalid/off-topic. 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