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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@97865 13f79535-47bb-0310-9956-ffa450edef68
362 lines
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XML
362 lines
22 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><!--
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XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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This file is generated from xml source: DO NOT EDIT
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XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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-->
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<title>mod_disk_cache - Apache HTTP Server</title>
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<link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" />
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<link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" />
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<link href="../style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" />
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<link href="../images/favicon.ico" rel="shortcut icon" /></head>
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<body>
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<div id="page-header">
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<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="../faq/">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p>
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<p class="apache">Apache HTTP Server Version 2.1</p>
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<img alt="" src="../images/feather.gif" /></div>
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<div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div>
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<div id="path">
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<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs-project/">Documentation</a> > <a href="../">Version 2.1</a> > <a href="./">Modules</a></div>
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<div id="page-content">
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<div id="preamble"><h1>Apache Module mod_disk_cache</h1>
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<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Content cache storage manager keyed to URIs</td></tr>
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<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
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<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>disk_cache_module</td></tr>
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<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_disk_cache.c</td></tr></table>
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<h3>Summary</h3>
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<div class="warning">
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This module is experimental. Documentation is still under development...
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</div>
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<p><code class="module"><a href="../mod/mod_disk_cache.html">mod_disk_cache</a></code> implements a disk based storage
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manager. It is primarily of use in conjunction with
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<code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code>.</p>
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<p>Content is stored in and retrieved from the cache using URI based
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keys. Content with access protection is not cached.</p>
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<div class="note"><h3>Note:</h3>
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<p><code class="module"><a href="../mod/mod_disk_cache.html">mod_disk_cache</a></code> requires the services of
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<code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code>.</p>
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</div>
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</div>
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<div id="quickview"><h3 class="directives">Directives</h3>
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<ul id="toc">
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<li><img alt="" src="../images/down.gif" /> <a href="#cachedirlength">CacheDirLength</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#cachedirlevels">CacheDirLevels</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#cacheexpirycheck">CacheExpiryCheck</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#cachegcclean">CacheGcClean</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#cachegcdaily">CacheGcDaily</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#cachegcinterval">CacheGcInterval</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#cachegcmemusage">CacheGcMemUsage</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#cachegcunused">CacheGcUnused</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#cachemaxfilesize">CacheMaxFileSize</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#cacheminfilesize">CacheMinFileSize</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#cacheroot">CacheRoot</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#cachesize">CacheSize</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#cachetimemargin">CacheTimeMargin</a></li>
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</ul>
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</div>
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<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="directive-section"><h2><a name="CacheDirLength" id="CacheDirLength">CacheDirLength</a> <a name="cachedirlength" id="cachedirlength">Directive</a></h2>
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<table class="directive">
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<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The number of characters in subdirectory names</td></tr>
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<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheDirLength <var>length</var></code></td></tr>
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<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheDirLength 2</code></td></tr>
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<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
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<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
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<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr>
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</table>
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<p>The <code class="directive">CacheDirLength</code> directive sets the number
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of characters for each subdirectory name in the cache hierarchy.</p>
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<div class="note">
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<p>The result of <code class="directive"><a href="#cachedirlevels">CacheDirLevels</a></code>* <code class="directive">CacheDirLength</code>
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must not be higher than 20.</p>
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</div>
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<div class="example"><p><code>
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CacheDirLength 4
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</code></p></div>
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</div>
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<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="directive-section"><h2><a name="CacheDirLevels" id="CacheDirLevels">CacheDirLevels</a> <a name="cachedirlevels" id="cachedirlevels">Directive</a></h2>
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<table class="directive">
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<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The number of levels of subdirectories in the
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cache.</td></tr>
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<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheDirLevels <var>levels</var></code></td></tr>
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<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheDirLevels 3</code></td></tr>
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<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
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<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
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<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr>
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</table>
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<p>The <code class="directive">CacheDirLevels</code> directive sets the number
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of subdirectory levels in the cache. Cached data will be saved this
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many directory levels below the <code class="directive"><a href="#cacheroot">CacheRoot</a></code> directory.</p>
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<div class="note">
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<p>The result of <code class="directive">CacheDirLevels</code>*
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<code class="directive"><a href="#cachedirlength">CacheDirLength</a></code> must
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not be higher than 20.</p>
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</div>
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<div class="example"><p><code>
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CacheDirLevels 5
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</code></p></div>
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</div>
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<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="directive-section"><h2><a name="CacheExpiryCheck" id="CacheExpiryCheck">CacheExpiryCheck</a> <a name="cacheexpirycheck" id="cacheexpirycheck">Directive</a></h2>
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<table class="directive">
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<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Indicates if the cache observes Expires dates when seeking
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files</td></tr>
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<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheExpiryCheck On|Off</code></td></tr>
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<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheExpiryCheck On</code></td></tr>
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<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
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<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
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<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr>
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</table>
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<p>More detail will be added here, when the function is implemented.</p>
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<div class="example"><p><code>
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CacheExpiryCheck Off<br />
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</code></p></div>
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<div class="warning">
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The <code class="directive">CacheExpiryCheck</code> directive is currently
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<em>not</em> implemented.
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</div>
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</div>
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<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="directive-section"><h2><a name="CacheGcClean" id="CacheGcClean">CacheGcClean</a> <a name="cachegcclean" id="cachegcclean">Directive</a></h2>
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<table class="directive">
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<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The time to retain unchanged cached files that match a
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URL</td></tr>
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<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheGcClean <var>hours</var> <var>url-string</var></code></td></tr>
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<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheGcClean ?</code></td></tr>
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<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
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<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
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<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr>
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</table>
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<p>More detail will be added here, when the function is implemented.</p>
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<div class="example"><p><code>
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CacheGcClean 12 /daily_scripts
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</code></p></div>
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<div class="warning">
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The <code class="directive">CacheGcClean</code> directive is currently
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<em>not</em> implemented.
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</div>
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</div>
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<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="directive-section"><h2><a name="CacheGcDaily" id="CacheGcDaily">CacheGcDaily</a> <a name="cachegcdaily" id="cachegcdaily">Directive</a></h2>
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<table class="directive">
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<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The recurring time each day for garbage collection to be run.
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(24 hour clock)</td></tr>
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<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheGcDaily <var>time</var></code></td></tr>
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<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheGcDaily ?</code></td></tr>
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<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
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<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
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<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr>
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</table>
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<p>More detail will be added here, when the function is implemented.</p>
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<div class="example"><p><code>
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CacheGcDaily 23:59
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</code></p></div>
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<div class="warning">
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The <code class="directive">CacheGcDaily</code> directive is currently
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<em>not</em> implemented.
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</div>
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</div>
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<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="directive-section"><h2><a name="CacheGcInterval" id="CacheGcInterval">CacheGcInterval</a> <a name="cachegcinterval" id="cachegcinterval">Directive</a></h2>
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<table class="directive">
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<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The interval between garbage collection attempts.</td></tr>
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<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheGcInterval <var>hours</var></code></td></tr>
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<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
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<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
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<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr>
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</table>
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<p>The <code class="directive">CacheGcInterval</code> directive specifies the
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number of hours to wait between attempts to free up disk space.</p>
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<p>More detail will be added here, when the function is implemented.</p>
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<div class="example"><p><code>
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CacheGcInterval 24<br />
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</code></p></div>
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<div class="warning">
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The <code class="directive">CacheGcInterval</code> directive is currently
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<em>not</em> implemented.
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</div>
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</div>
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<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="directive-section"><h2><a name="CacheGcMemUsage" id="CacheGcMemUsage">CacheGcMemUsage</a> <a name="cachegcmemusage" id="cachegcmemusage">Directive</a></h2>
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<table class="directive">
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<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The maximum kilobytes of memory used for garbage
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collection</td></tr>
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<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheGcMemUsage <var>KBytes</var></code></td></tr>
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<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheGcMemUsage ?</code></td></tr>
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<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
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<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
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<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr>
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</table>
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<p>More detail will be added here, when the function is implemented.</p>
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<div class="example"><p><code>
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CacheGcMemUsage 16
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</code></p></div>
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<div class="warning">
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The <code class="directive">CacheGcMemUsage</code> directive is currently
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<em>not</em> implemented.
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</div>
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</div>
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<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="directive-section"><h2><a name="CacheGcUnused" id="CacheGcUnused">CacheGcUnused</a> <a name="cachegcunused" id="cachegcunused">Directive</a></h2>
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<table class="directive">
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<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The time to retain unreferenced cached files that match a
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URL.</td></tr>
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<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheGcUnused <var>hours</var> <var>url-string</var></code></td></tr>
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<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheGcUnused ?</code></td></tr>
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<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
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<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
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<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr>
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</table>
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<p>More detail will be added here, when the function is implemented.</p>
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<div class="example"><p><code>
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CacheGcUnused 12 /local_images
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</code></p></div>
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<div class="warning">
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||
The <code class="directive">CacheGcUnused</code> directive is currently
|
||
<em>not</em> implemented.
|
||
</div>
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||
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||
</div>
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||
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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||
<div class="directive-section"><h2><a name="CacheMaxFileSize" id="CacheMaxFileSize">CacheMaxFileSize</a> <a name="cachemaxfilesize" id="cachemaxfilesize">Directive</a></h2>
|
||
<table class="directive">
|
||
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The maximum size (in bytes) of a document to be placed in the
|
||
cache</td></tr>
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||
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheMaxFileSize <var>bytes</var></code></td></tr>
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||
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheMaxFileSize 1000000</code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
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||
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
|
||
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr>
|
||
</table>
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||
<p>The <code class="directive">CacheMaxFileSize</code> directive sets the
|
||
maximum size, in bytes, for a document to be considered for storage in
|
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the cache.</p>
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||
|
||
<div class="example"><p><code>
|
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CacheMaxFileSize 64000
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</code></p></div>
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||
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||
</div>
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||
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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||
<div class="directive-section"><h2><a name="CacheMinFileSize" id="CacheMinFileSize">CacheMinFileSize</a> <a name="cacheminfilesize" id="cacheminfilesize">Directive</a></h2>
|
||
<table class="directive">
|
||
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The minimum size (in bytes) of a document to be placed in the
|
||
cache</td></tr>
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||
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheMinFileSize <var>bytes</var></code></td></tr>
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||
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheMinFileSize 1</code></td></tr>
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||
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
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||
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
|
||
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr>
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||
</table>
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||
<p>The <code class="directive">CacheMinFileSize</code> directive sets the
|
||
minimum size, in bytes, for a document to be considered for storage
|
||
in the cache.</p>
|
||
|
||
<div class="example"><p><code>
|
||
CacheMinFileSize 64
|
||
</code></p></div>
|
||
|
||
</div>
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||
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
|
||
<div class="directive-section"><h2><a name="CacheRoot" id="CacheRoot">CacheRoot</a> <a name="cacheroot" id="cacheroot">Directive</a></h2>
|
||
<table class="directive">
|
||
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The directory root under which cache files are
|
||
stored</td></tr>
|
||
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheRoot <var>directory</var></code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>none</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>Experimental</td></tr>
|
||
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr>
|
||
</table>
|
||
<p>The <code class="directive">CacheRoot</code> directive defines the name of
|
||
the directory on the disk to contain cache files. If the <code class="module"><a href="../mod/mod_disk_cache.html">mod_disk_cache</a></code> module has been loaded or compiled in to the
|
||
Apache server, this directive <em>must</em> be defined. Failing to
|
||
provide a value for <code class="directive">CacheRoot</code> will result in
|
||
a configuration file processing error. The <code class="directive"><a href="#cachedirlevels">CacheDirLevels</a></code> and <code class="directive"><a href="#cachedirlength">CacheDirLength</a></code> directives define
|
||
the structure of the directories under the specified root directory.</p>
|
||
|
||
<div class="example"><p><code>
|
||
CacheRoot c:/cacheroot
|
||
</code></p></div>
|
||
|
||
</div>
|
||
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
|
||
<div class="directive-section"><h2><a name="CacheSize" id="CacheSize">CacheSize</a> <a name="cachesize" id="cachesize">Directive</a></h2>
|
||
<table class="directive">
|
||
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The maximum amount of disk space that will be used by the
|
||
cache in KBytes</td></tr>
|
||
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheSize <var>KBytes</var></code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheSize 1000000</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>Experimental</td></tr>
|
||
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr>
|
||
</table>
|
||
<p>The <code class="directive">CacheSize</code> directive sets the desired
|
||
disk space usage of the cache, in KBytes (1024-byte units). This
|
||
directive does not put a hard limit on the size of the cache. The
|
||
garbage collector will delete files until the usage is at or below the
|
||
settings. Always use a value that is lower than the available disk
|
||
space.</p>
|
||
|
||
<div class="example"><p><code>
|
||
CacheSize 5000000
|
||
</code></p></div>
|
||
|
||
</div>
|
||
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
|
||
<div class="directive-section"><h2><a name="CacheTimeMargin" id="CacheTimeMargin">CacheTimeMargin</a> <a name="cachetimemargin" id="cachetimemargin">Directive</a></h2>
|
||
<table class="directive">
|
||
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The minimum time margin to cache a document</td></tr>
|
||
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheTimeMargin <var>?</var></code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheTimeMargin ?</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>Experimental</td></tr>
|
||
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr>
|
||
</table>
|
||
<p>More detail will be added here, when the function is implemented.</p>
|
||
|
||
<div class="example"><p><code>
|
||
CacheTimeMargin X
|
||
</code></p></div>
|
||
|
||
<div class="warning">
|
||
The <code class="directive">CacheTimeMargin</code> directive is currently
|
||
<em>not</em> implemented.
|
||
</div>
|
||
|
||
</div>
|
||
</div>
|
||
<div id="footer">
|
||
<p class="apache">Maintained by the <a href="http://httpd.apache.org/docs-project/">Apache HTTP Server Documentation Project</a></p>
|
||
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