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| <p class="apache">Apache HTTP Server Version 2.4</p> |
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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="../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="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"><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 <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"><IfModule mod_headers.c> |
| # 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$" "-" [T=text/javascript,E=no-gzip:1] |
| |
| |
| <FilesMatch "(\.js\.gz|\.css\.gz)$"> |
| # 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>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"> |
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