github.com/krum110487/go-htaccess@v0.0.0-20240316004156-60641c8e7598/tests/data/apache_2_2_34/manual/mod/mod_deflate.html.en (about) 1 <?xml version="1.0" encoding="ISO-8859-1"?> 2 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> 3 <html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head> 4 <meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type" /> 5 <!-- 6 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 7 This file is generated from xml source: DO NOT EDIT 8 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 9 --> 10 <title>mod_deflate - Apache HTTP Server Version 2.2</title> 11 <link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" /> 12 <link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" /> 13 <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" /> 14 <script src="../style/scripts/prettify.min.js" type="text/javascript"> 15 </script> 16 17 <link href="../images/favicon.ico" rel="shortcut icon" /><link href="http://httpd.apache.org/docs/current/mod/mod_deflate.html" rel="canonical" /></head> 18 <body> 19 <div id="page-header"> 20 <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> 21 <p class="apache">Apache HTTP Server Version 2.2</p> 22 <img alt="" src="../images/feather.gif" /></div> 23 <div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div> 24 <div id="path"> 25 <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 2.2</a> > <a href="./">Modules</a></div> 26 <div id="page-content"> 27 <div class="retired"><h4>Please note</h4> 28 <p> This document refers to a legacy release (<strong>2.2</strong>) of Apache httpd. The active release (<strong>2.4</strong>) is documented <a href="http://httpd.apache.org/docs/current">here</a>. If you have not already upgraded, please follow <a href="http://httpd.apache.org/docs/current/upgrading.html">this link</a> for more information.</p> 29 <p>You may follow <a href="http://httpd.apache.org/docs/current/mod/mod_deflate.html">this link</a> to go to the current version of this document.</p></div><div id="preamble"><h1>Apache Module mod_deflate</h1> 30 <div class="toplang"> 31 <p><span>Available Languages: </span><a href="../en/mod/mod_deflate.html" title="English"> en </a> | 32 <a href="../ja/mod/mod_deflate.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> | 33 <a href="../ko/mod/mod_deflate.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p> 34 </div> 35 <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Compress content before it is delivered to the 36 client</td></tr> 37 <tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr> 38 <tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>deflate_module</td></tr> 39 <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_deflate.c</td></tr></table> 40 <h3>Summary</h3> 41 42 <p>The <code class="module"><a href="../mod/mod_deflate.html">mod_deflate</a></code> module provides 43 the <code>DEFLATE</code> output filter that allows output from 44 your server to be compressed before being sent to the client over 45 the network.</p> 46 </div> 47 <div id="quickview"><h3>Topics</h3> 48 <ul id="topics"> 49 <li><img alt="" src="../images/down.gif" /> <a href="#recommended">Sample Configurations</a></li> 50 <li><img alt="" src="../images/down.gif" /> <a href="#enable">Enabling Compression</a></li> 51 <li><img alt="" src="../images/down.gif" /> <a href="#proxies">Dealing with proxy servers</a></li> 52 </ul><h3 class="directives">Directives</h3> 53 <ul id="toc"> 54 <li><img alt="" src="../images/down.gif" /> <a href="#deflatebuffersize">DeflateBufferSize</a></li> 55 <li><img alt="" src="../images/down.gif" /> <a href="#deflatecompressionlevel">DeflateCompressionLevel</a></li> 56 <li><img alt="" src="../images/down.gif" /> <a href="#deflatefilternote">DeflateFilterNote</a></li> 57 <li><img alt="" src="../images/down.gif" /> <a href="#deflateinflatelimitrequestbody">DeflateInflateLimitRequestBody</a></li> 58 <li><img alt="" src="../images/down.gif" /> <a href="#deflateinflateratioburst">DeflateInflateRatioBurst</a></li> 59 <li><img alt="" src="../images/down.gif" /> <a href="#deflateinflateratiolimit">DeflateInflateRatioLimit</a></li> 60 <li><img alt="" src="../images/down.gif" /> <a href="#deflatememlevel">DeflateMemLevel</a></li> 61 <li><img alt="" src="../images/down.gif" /> <a href="#deflatewindowsize">DeflateWindowSize</a></li> 62 </ul> 63 <h3>See also</h3> 64 <ul class="seealso"> 65 <li><a href="../filter.html">Filters</a></li> 66 </ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div> 67 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> 68 <div class="section"> 69 <h2><a name="recommended" id="recommended">Sample Configurations</a></h2> 70 <div class="warning"><h3>Compression and TLS</h3> 71 <p>Some web applications are vulnerable to an information disclosure 72 attack when a TLS connection carries deflate compressed data. For more 73 information, review the details of the "BREACH" family of attacks.</p> 74 </div> 75 <p>This is a simple configuration that compresses common text-based content types.</p> 76 77 <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> 78 </div> 79 80 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> 81 <div class="section"> 82 <h2><a name="enable" id="enable">Enabling Compression</a></h2> 83 84 <h3><a name="output" id="output">Output Compression</a></h3> 85 <p>Compression is implemented by the <code>DEFLATE</code> 86 <a href="../filter.html">filter</a>. The following directive 87 will enable compression for documents in the container where it 88 is placed:</p> 89 90 <div class="example"><p><code> 91 SetOutputFilter DEFLATE 92 </code></p></div> 93 94 <p>Some popular browsers cannot handle compression of all content 95 so you may want to set the <code>gzip-only-text/html</code> note to 96 <code>1</code> to only allow html files to be compressed (see 97 below). If you set this to <em>anything but <code>1</code></em> it 98 will be ignored.</p> 99 100 <p>If you want to restrict the compression to particular MIME types 101 in general, you may use the <code class="directive"><a href="../mod/core.html#addoutputfilterbytype">AddOutputFilterByType</a></code> directive. Here is an example of 102 enabling compression only for the html files of the Apache 103 documentation:</p> 104 105 <div class="example"><p><code> 106 <Directory "/your-server-root/manual"><br /> 107 <span class="indent"> 108 AddOutputFilterByType DEFLATE text/html<br /> 109 </span> 110 </Directory> 111 </code></p></div> 112 113 <p>For browsers that have problems even with compression of all file 114 types, use the <code class="directive"><a href="../mod/mod_setenvif.html#browsermatch">BrowserMatch</a></code> directive to set the <code>no-gzip</code> 115 note for that particular browser so that no compression will be 116 performed. You may combine <code>no-gzip</code> with <code>gzip-only-text/html</code> to get the best results. In that case 117 the former overrides the latter. Take a look at the following 118 excerpt from the <a href="#recommended">configuration example</a> 119 defined in the section above:</p> 120 121 <div class="example"><p><code> 122 BrowserMatch ^Mozilla/4 gzip-only-text/html<br /> 123 BrowserMatch ^Mozilla/4\.0[678] no-gzip<br /> 124 BrowserMatch \bMSIE !no-gzip !gzip-only-text/html 125 </code></p></div> 126 127 <p>At first we probe for a <code>User-Agent</code> string that 128 indicates a Netscape Navigator version of 4.x. These versions 129 cannot handle compression of types other than 130 <code>text/html</code>. The versions 4.06, 4.07 and 4.08 also 131 have problems with decompressing html files. Thus, we completely 132 turn off the deflate filter for them.</p> 133 134 <p>The third <code class="directive"><a href="../mod/mod_setenvif.html#browsermatch">BrowserMatch</a></code> 135 directive fixes the guessed identity of the user agent, because 136 the Microsoft Internet Explorer identifies itself also as "Mozilla/4" 137 but is actually able to handle requested compression. Therefore we 138 match against the additional string "MSIE" (<code>\b</code> means 139 "word boundary") in the <code>User-Agent</code> Header and turn off 140 the restrictions defined before.</p> 141 142 <div class="note"><h3>Note</h3> 143 The <code>DEFLATE</code> filter is always inserted after RESOURCE 144 filters like PHP or SSI. It never touches internal subrequests. 145 </div> 146 <div class="note"><h3>Note</h3> 147 There is an environment variable <code>force-gzip</code>, 148 set via <code class="directive"><a href="../mod/mod_env.html#setenv">SetEnv</a></code>, which 149 will ignore the accept-encoding setting of your browser and will 150 send compressed output. 151 </div> 152 153 154 <h3><a name="inflate" id="inflate">Output Decompression</a></h3> 155 <p>The <code class="module"><a href="../mod/mod_deflate.html">mod_deflate</a></code> module also provides a filter for 156 inflating/uncompressing a gzip compressed response body. In order to activate 157 this feature you have to insert the <code>INFLATE</code> filter into 158 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> 159 160 <div class="example"><p><code> 161 <Location /dav-area><br /> 162 <span class="indent"> 163 ProxyPass http://example.com/<br /> 164 SetOutputFilter INFLATE<br /> 165 </span> 166 </Location> 167 </code></p></div> 168 169 <p>This Example will uncompress gzip'ed output from example.com, so other 170 filters can do further processing with it. 171 </p> 172 173 174 <h3><a name="input" id="input">Input Decompression</a></h3> 175 <p>The <code class="module"><a href="../mod/mod_deflate.html">mod_deflate</a></code> module also provides a filter for 176 decompressing a gzip compressed request body . In order to activate 177 this feature you have to insert the <code>DEFLATE</code> filter into 178 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> 179 180 <div class="example"><p><code> 181 <Location /dav-area><br /> 182 <span class="indent"> 183 SetInputFilter DEFLATE<br /> 184 </span> 185 </Location> 186 </code></p></div> 187 188 <p>Now if a request contains a <code>Content-Encoding: 189 gzip</code> header, the body will be automatically decompressed. 190 Few browsers have the ability to gzip request bodies. However, 191 some special applications actually do support request 192 compression, for instance some <a href="http://www.webdav.org">WebDAV</a> clients.</p> 193 194 <div class="warning"><h3>Note on Content-Length</h3> 195 <p>If you evaluate the request body yourself, <em>don't trust 196 the <code>Content-Length</code> header!</em> 197 The Content-Length header reflects the length of the 198 incoming data from the client and <em>not</em> the byte count of 199 the decompressed data stream.</p> 200 </div> 201 202 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> 203 <div class="section"> 204 <h2><a name="proxies" id="proxies">Dealing with proxy servers</a></h2> 205 206 <p>The <code class="module"><a href="../mod/mod_deflate.html">mod_deflate</a></code> module sends a <code>Vary: 207 Accept-Encoding</code> HTTP response header to alert proxies that 208 a cached response should be sent only to clients that send the 209 appropriate <code>Accept-Encoding</code> request header. This 210 prevents compressed content from being sent to a client that will 211 not understand it.</p> 212 213 <p>If you use some special exclusions dependent 214 on, for example, the <code>User-Agent</code> header, you must 215 manually configure an addition to the <code>Vary</code> header 216 to alert proxies of the additional restrictions. For example, 217 in a typical configuration where the addition of the <code>DEFLATE</code> 218 filter depends on the <code>User-Agent</code>, you should add:</p> 219 220 <div class="example"><p><code> 221 Header append Vary User-Agent 222 </code></p></div> 223 224 <p>If your decision about compression depends on other information 225 than request headers (<em>e.g.</em> HTTP version), you have to set the 226 <code>Vary</code> header to the value <code>*</code>. This prevents 227 compliant proxies from caching entirely.</p> 228 229 <div class="example"><h3>Example</h3><p><code> 230 Header set Vary * 231 </code></p></div> 232 </div> 233 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> 234 <div class="directive-section"><h2><a name="DeflateBufferSize" id="DeflateBufferSize">DeflateBufferSize</a> <a name="deflatebuffersize" id="deflatebuffersize">Directive</a></h2> 235 <table class="directive"> 236 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Fragment size to be compressed at one time by zlib</td></tr> 237 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>DeflateBufferSize <var>value</var></code></td></tr> 238 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>DeflateBufferSize 8096</code></td></tr> 239 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr> 240 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr> 241 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_deflate</td></tr> 242 </table> 243 <p>The <code class="directive">DeflateBufferSize</code> directive specifies 244 the size in bytes of the fragments that zlib should compress at one 245 time.</p> 246 247 </div> 248 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> 249 <div class="directive-section"><h2><a name="DeflateCompressionLevel" id="DeflateCompressionLevel">DeflateCompressionLevel</a> <a name="deflatecompressionlevel" id="deflatecompressionlevel">Directive</a></h2> 250 <table class="directive"> 251 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>How much compression do we apply to the output</td></tr> 252 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>DeflateCompressionLevel <var>value</var></code></td></tr> 253 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>Zlib's default</code></td></tr> 254 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr> 255 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr> 256 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_deflate</td></tr> 257 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>This directive is available since Apache 2.0.45</td></tr> 258 </table> 259 <p>The <code class="directive">DeflateCompressionLevel</code> directive specifies 260 what level of compression should be used, the higher the value, 261 the better the compression, but the more CPU time is required to 262 achieve this.</p> 263 <p>The value must between 1 (less compression) and 9 (more compression).</p> 264 265 </div> 266 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> 267 <div class="directive-section"><h2><a name="DeflateFilterNote" id="DeflateFilterNote">DeflateFilterNote</a> <a name="deflatefilternote" id="deflatefilternote">Directive</a></h2> 268 <table class="directive"> 269 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Places the compression ratio in a note for logging</td></tr> 270 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>DeflateFilterNote [<var>type</var>] <var>notename</var></code></td></tr> 271 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr> 272 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr> 273 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_deflate</td></tr> 274 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td><var>type</var> is available since Apache 2.0.45</td></tr> 275 </table> 276 <p>The <code class="directive">DeflateFilterNote</code> directive 277 specifies that a note about compression ratios should be attached 278 to the request. The name of the note is the value specified for 279 the directive. You can use that note for statistical purposes by 280 adding the value to your <a href="../logs.html#accesslog">access log</a>.</p> 281 282 <div class="example"><h3>Example</h3><p><code> 283 DeflateFilterNote ratio<br /> 284 <br /> 285 LogFormat '"%r" %b (%{ratio}n) "%{User-agent}i"' deflate<br /> 286 CustomLog logs/deflate_log deflate 287 </code></p></div> 288 289 <p>If you want to extract more accurate values from your logs, you 290 can use the <var>type</var> argument to specify the type of data 291 left as a note for logging. <var>type</var> can be one of:</p> 292 293 <dl> 294 <dt><code>Input</code></dt> 295 <dd>Store the byte count of the filter's input stream in the note.</dd> 296 297 <dt><code>Output</code></dt> 298 <dd>Store the byte count of the filter's output stream in the note.</dd> 299 300 <dt><code>Ratio</code></dt> 301 <dd>Store the compression ratio (<code>output/input * 100</code>) 302 in the note. This is the default, if the <var>type</var> argument 303 is omitted.</dd> 304 </dl> 305 306 <p>Thus you may log it this way:</p> 307 308 <div class="example"><h3>Accurate Logging</h3><p><code> 309 DeflateFilterNote Input instream<br /> 310 DeflateFilterNote Output outstream<br /> 311 DeflateFilterNote Ratio ratio<br /> 312 <br /> 313 LogFormat '"%r" %{outstream}n/%{instream}n (%{ratio}n%%)' deflate<br /> 314 CustomLog logs/deflate_log deflate 315 </code></p></div> 316 317 <h3>See also</h3> 318 <ul> 319 <li><code class="module"><a href="../mod/mod_log_config.html">mod_log_config</a></code></li> 320 </ul> 321 </div> 322 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> 323 <div class="directive-section"><h2><a name="DeflateInflateLimitRequestBody" id="DeflateInflateLimitRequestBody">DeflateInflateLimitRequestBody</a> <a name="deflateinflatelimitrequestbody" id="deflateinflatelimitrequestbody">Directive</a></h2> 324 <table class="directive"> 325 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maximum size of inflated request bodies</td></tr> 326 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>DeflateInflateLimitRequestBody<var>value</var></code></td></tr> 327 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>None, but LimitRequestBody applies after deflation</code></td></tr> 328 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr> 329 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr> 330 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_deflate</td></tr> 331 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>2.2.28 and later</td></tr> 332 </table> 333 <p>The <code class="directive">DeflateInflateLimitRequestBody</code> directive 334 specifies the maximum size of an inflated request body. If it is unset, 335 <code class="directive"><a href="../mod/core.html#limitrequestbody">LimitRequestBody</a></code> is applied to the 336 inflated body.</p> 337 338 </div> 339 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> 340 <div class="directive-section"><h2><a name="DeflateInflateRatioBurst" id="DeflateInflateRatioBurst">DeflateInflateRatioBurst</a> <a name="deflateinflateratioburst" id="deflateinflateratioburst">Directive</a></h2> 341 <table class="directive"> 342 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maximum number of times the inflation ratio for request bodies 343 can be crossed</td></tr> 344 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>DeflateInflateRatioBurst <var>value</var></code></td></tr> 345 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>3</code></td></tr> 346 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr> 347 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr> 348 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_deflate</td></tr> 349 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>2.2.28 and later</td></tr> 350 </table> 351 <p>The <code class="directive">DeflateInflateRatioBurst</code> directive 352 specifies the maximum number of times the 353 <code class="directive">DeflateInflateRatioLimit</code> can be crossed before 354 terminating the request.</p> 355 356 </div> 357 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> 358 <div class="directive-section"><h2><a name="DeflateInflateRatioLimit" id="DeflateInflateRatioLimit">DeflateInflateRatioLimit</a> <a name="deflateinflateratiolimit" id="deflateinflateratiolimit">Directive</a></h2> 359 <table class="directive"> 360 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maximum inflation ratio for request bodies</td></tr> 361 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>DeflateInflateRatioLimit <var>value</var></code></td></tr> 362 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>200</code></td></tr> 363 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr> 364 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr> 365 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_deflate</td></tr> 366 <tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>2.2.28 and later</td></tr> 367 </table> 368 <p>The <code class="directive">DeflateInflateRatioLimit</code> directive 369 specifies the maximum ratio of deflated to inflated size of an 370 inflated request body. This ratio is checked as the body is 371 streamed in, and if crossed more than 372 <code class="directive">DeflateInflateRatioBurst</code> times, the request 373 will be terminated.</p> 374 375 </div> 376 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> 377 <div class="directive-section"><h2><a name="DeflateMemLevel" id="DeflateMemLevel">DeflateMemLevel</a> <a name="deflatememlevel" id="deflatememlevel">Directive</a></h2> 378 <table class="directive"> 379 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>How much memory should be used by zlib for compression</td></tr> 380 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>DeflateMemLevel <var>value</var></code></td></tr> 381 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>DeflateMemLevel 9</code></td></tr> 382 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr> 383 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr> 384 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_deflate</td></tr> 385 </table> 386 <p>The <code class="directive">DeflateMemLevel</code> directive specifies 387 how much memory should be used by zlib for compression 388 (a value between 1 and 9).</p> 389 390 </div> 391 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> 392 <div class="directive-section"><h2><a name="DeflateWindowSize" id="DeflateWindowSize">DeflateWindowSize</a> <a name="deflatewindowsize" id="deflatewindowsize">Directive</a></h2> 393 <table class="directive"> 394 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Zlib compression window size</td></tr> 395 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>DeflateWindowSize <var>value</var></code></td></tr> 396 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>DeflateWindowSize 15</code></td></tr> 397 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr> 398 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr> 399 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_deflate</td></tr> 400 </table> 401 <p>The <code class="directive">DeflateWindowSize</code> directive specifies the 402 zlib compression window size (a value between 1 and 15). Generally, the 403 higher the window size, the higher can the compression ratio be expected.</p> 404 405 </div> 406 </div> 407 <div class="bottomlang"> 408 <p><span>Available Languages: </span><a href="../en/mod/mod_deflate.html" title="English"> en </a> | 409 <a href="../ja/mod/mod_deflate.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> | 410 <a href="../ko/mod/mod_deflate.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p> 411 </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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