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<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><!--
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This file is generated from xml source: DO NOT EDIT
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--><title>mod_cache - Apache HTTP Server</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 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="../faq/">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p><p class="apache">Apache HTTP Server Version 2.0</p><img alt="" src="../images/feather.gif" /></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-project/">Documentation</a> > <a href="../">Version 2.0</a> > <a href="./">Modules</a></div><div id="page-content"><div id="preamble"><h1>Apache Module mod_cache</h1><table class="module"><tr><th><a href="module-dict.html#Description">Description:
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</a></th><td>Content cache keyed to URIs.</td></tr><tr><th><a href="module-dict.html#Status">Status:
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</a></th><td>Experimental</td></tr><tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:
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</a></th><td>cache_module</td></tr><tr><th><a href="module-dict.html#SourceFile">Source File:
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</a></th><td>mod_cache.c</td></tr></table><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_cache.html">mod_cache</a></code> implements an <a href="http://www.ietf.org/rfc/rfc2616.txt">RFC 2616</a> compliant HTTP
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content cache that can be used to cache either local or proxied content.
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<code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> requires the services of one or more storage
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management modules. Two storage management modules are included in
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the base Apache distribution:</p>
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<dl>
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<dt><code class="module"><a href="../mod/mod_disk_cache.html">mod_disk_cache</a></code></dt>
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<dd>implements a disk based storage manager for use with
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<code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></dd>
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<dt><code class="module"><a href="../mod/mod_mem_cache.html">mod_mem_cache</a></code></dt>
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<dd>implements an in-memory based storage manager.
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<code class="module"><a href="../mod/mod_mem_cache.html">mod_mem_cache</a></code> can be configured to operate in two
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modes: caching open file descriptors or caching objects in heap storage.
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<code class="module"><a href="../mod/mod_mem_cache.html">mod_mem_cache</a></code> is most useful when used to cache
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locally generated content or to cache backend server content for
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<code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code> configured for <code class="directive"><a href="../mod/mod_proxy.html#proxypass">ProxyPass</a></code> (aka <dfn>reverse proxy</dfn>)</dd>
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</dl>
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<p>Content stored and retrived keyed to the URL. Content with
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access protections is not cached.</p>
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</div><div id="quickview"><h3 class="directives">Directives</h3><ul id="toc"><li><img alt="" src="../images/down.gif" /> <a href="#cachedefaultexpire">CacheDefaultExpire</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#cachedisable">CacheDisable</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#cacheenable">CacheEnable</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#cacheforcecompletion">CacheForceCompletion</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#cacheignorecachecontrol">CacheIgnoreCacheControl</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#cacheignorenolastmod">CacheIgnoreNoLastMod</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#cachelastmodifiedfactor">CacheLastModifiedFactor</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#cachemaxexpire">CacheMaxExpire</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#cachemaxstreamingbuffer">CacheMaxStreamingBuffer</a></li>
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</ul><h3>Topics</h3><ul id="topics"><li><img alt="" src="../images/down.gif" /> <a href="#related">Related Modules and Directives</a></li><li><img alt="" src="../images/down.gif" /> <a href="#sampleconf">Sample Configuration</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="related" id="related">Related Modules and Directives</a></h2>
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<table class="related"><tr><th>Related Modules</th><th>Related Directives</th></tr><tr><td><ul><li><code class="module"><a href="../mod/mod_disk_cache.html">mod_disk_cache</a></code></li><li><code class="module"><a href="../mod/mod_mem_cache.html">mod_mem_cache</a></code></li></ul></td><td><ul><li><code class="directive"><a href="../mod/mod_disk_cache.html#cacheroot">CacheRoot</a></code></li><li><code class="directive"><a href="../mod/mod_disk_cache.html#cachesize">CacheSize</a></code></li><li><code class="directive"><a href="../mod/mod_disk_cache.html#cachegcinterval">CacheGcInterval</a></code></li><li><code class="directive"><a href="../mod/mod_disk_cache.html#cachedirlevels">CacheDirLevels</a></code></li><li><code class="directive"><a href="../mod/mod_disk_cache.html#cachedirlength">CacheDirLength</a></code></li><li><code class="directive"><a href="../mod/mod_disk_cache.html#cacheexpirycheck">CacheExpiryCheck</a></code></li><li><code class="directive"><a href="../mod/mod_disk_cache.html#cacheminfilesize">CacheMinFileSize</a></code></li><li><code class="directive"><a href="../mod/mod_disk_cache.html#cachemaxfilesize">CacheMaxFileSize</a></code></li><li><code class="directive"><a href="../mod/mod_disk_cache.html#cachetimemargin">CacheTimeMargin</a></code></li><li><code class="directive"><a href="../mod/mod_disk_cache.html#cachegcdaily">CacheGcDaily</a></code></li><li><code class="directive"><a href="../mod/mod_disk_cache.html#cachegcunused">CacheGcUnused</a></code></li><li><code class="directive"><a href="../mod/mod_disk_cache.html#cachegcclean">CacheGcClean</a></code></li><li><code class="directive"><a href="../mod/mod_disk_cache.html#cachegcmemusage">CacheGcMemUsage</a></code></li><li><code class="directive"><a href="../mod/mod_mem_cache.html#mcachesize">MCacheSize</a></code></li><li><code class="directive"><a href="../mod/mod_mem_cache.html#mcachemaxobjectcount">MCacheMaxObjectCount</a></code></li><li><code class="directive"><a href="../mod/mod_mem_cache.html#mcacheminobjectsize">MCacheMinObjectSize</a></code></li><li><code class="directive"><a href="../mod/mod_mem_cache.html#mcachemaxobjectsize">MCacheMaxObjectSize</a></code></li><li><code class="directive"><a href="../mod/mod_mem_cache.html#mcacheremovalalgorithm">MCacheRemovalAlgorithm</a></code></li></ul></td></tr></table>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><div class="section"><h2><a name="sampleconf" id="sampleconf">Sample Configuration</a></h2>
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<div class="example"><h3>Sample httpd.conf</h3><p><code>
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#<br />
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# Sample Cache Configuration<br />
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#<br />
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LoadModule cache_module modules/mod_cache.so<br />
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<br />
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<IfModule mod_cache.c><br />
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<span class="indent">
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#LoadModule disk_cache_module modules/mod_disk_cache.so<br />
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<IfModule mod_disk_cache.c><br />
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<span class="indent">
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CacheRoot c:/cacheroot<br />
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CacheSize 256<br />
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CacheEnable disk /<br />
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CacheDirLevels 5<br />
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CacheDirLength 3<br />
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</span>
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</IfModule> <br />
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<br />
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LoadModule mem_cache_module modules/mod_mem_cache.so<br />
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<IfModule mod_mem_cache.c><br />
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<span class="indent">
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MCacheEnable mem /<br />
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MCacheSize 4096<br />
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MCacheMaxObjectCount 100<br />
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MCacheMinObjectSize 1<br />
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MCacheMaxObjectSize 2048<br />
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</span>
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</IfModule><br />
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</span>
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</IfModule>
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</code></p></div>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><div class="directive-section"><h2><a name="CacheDefaultExpire" id="CacheDefaultExpire">CacheDefaultExpire</a> <a name="cachedefaultexpire" id="cachedefaultexpire">Directive</a></h2><table class="directive"><tr><th><a href="directive-dict.html#Description">Description:
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</a></th><td>The default time in seconds to cache a document</td></tr><tr><th><a href="directive-dict.html#Syntax">Syntax:
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</a></th><td><code>CacheDefaultExpire <var>seconds</var></code></td></tr><tr><th><a href="directive-dict.html#Default">Default:
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</a></th><td><code>CacheDefaultExpire 3600 (one hour)</code></td></tr><tr><th><a href="directive-dict.html#Context">Context:
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</a></th><td>server config, virtual host</td></tr><tr><th><a href="directive-dict.html#Status">Status:
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</a></th><td>Experimental</td></tr><tr><th><a href="directive-dict.html#Module">Module:
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</a></th><td>mod_cache</td></tr></table>
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<p>The default time in seconds to cache a document if the page does not have
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an expiry date in the <code>Expires</code> field.</p>
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<div class="example"><p><code>
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CacheDefaultExpire 86400
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</code></p></div>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><div class="directive-section"><h2><a name="CacheDisable" id="CacheDisable">CacheDisable</a> <a name="cachedisable" id="cachedisable">Directive</a></h2><table class="directive"><tr><th><a href="directive-dict.html#Description">Description:
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</a></th><td>Disable caching of specified URLs by specified storage
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manager</td></tr><tr><th><a href="directive-dict.html#Syntax">Syntax:
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</a></th><td><code>CacheDisable <var>cache_type</var> <var>url-string</var></code></td></tr><tr><th><a href="directive-dict.html#Context">Context:
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</a></th><td>server config, virtual host</td></tr><tr><th><a href="directive-dict.html#Status">Status:
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</a></th><td>Experimental</td></tr><tr><th><a href="directive-dict.html#Module">Module:
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</a></th><td>mod_cache</td></tr></table>
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<p>The <code class="directive">CacheDisable</code> directive instructs
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<code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> to <em>not</em> cache urls at or below
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<var>url-string</var>.</p>
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<div class="example"><h3>Example</h3><p><code>
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CacheDisable disk /local_files
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</code></p></div>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><div class="directive-section"><h2><a name="CacheEnable" id="CacheEnable">CacheEnable</a> <a name="cacheenable" id="cacheenable">Directive</a></h2><table class="directive"><tr><th><a href="directive-dict.html#Description">Description:
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</a></th><td>Enable caching specified URLs in a specified storage
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manager</td></tr><tr><th><a href="directive-dict.html#Syntax">Syntax:
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</a></th><td><code>CacheEnable <var>cache_type</var> <var>url-string</var></code></td></tr><tr><th><a href="directive-dict.html#Context">Context:
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</a></th><td>server config, virtual host</td></tr><tr><th><a href="directive-dict.html#Status">Status:
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</a></th><td>Experimental</td></tr><tr><th><a href="directive-dict.html#Module">Module:
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</a></th><td>mod_cache</td></tr></table>
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<p>The <code class="directive">CacheEnable</code> directive instructs
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<code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> to cache urls at or below
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<var>url-string</var>. The cache store is specified with the
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<var>cache_type</var> argument. <var>cache_type</var> <code>mem</code>
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instructs <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> to use the in-memory cache storage
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manager implemented by <code class="module"><a href="../mod/mod_mem_cache.html">mod_mem_cache</a></code>.
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<var>cache_type</var> <code>disk</code> instructs
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<code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> to use the cache storage manager implemented
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by <code class="module"><a href="../mod/mod_disk_cache.html">mod_disk_cache</a></code>.</p>
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<div class="example"><p><code>
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CacheEnable disk /<br />
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CacheEnable mem /manual<br />
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CacheEnable fd /images<br />
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</code></p></div>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><div class="directive-section"><h2><a name="CacheForceCompletion" id="CacheForceCompletion">CacheForceCompletion</a> <a name="cacheforcecompletion" id="cacheforcecompletion">Directive</a></h2><table class="directive"><tr><th><a href="directive-dict.html#Description">Description:
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</a></th><td>Percentage of download to arrive for the cache to force
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complete transfer</td></tr><tr><th><a href="directive-dict.html#Syntax">Syntax:
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</a></th><td><code>CacheForceCompletion <var>Percentage</var></code></td></tr><tr><th><a href="directive-dict.html#Default">Default:
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</a></th><td><code>CacheForceCompletion 60</code></td></tr><tr><th><a href="directive-dict.html#Context">Context:
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</a></th><td>server config, virtual host</td></tr><tr><th><a href="directive-dict.html#Status">Status:
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</a></th><td>Experimental</td></tr><tr><th><a href="directive-dict.html#Module">Module:
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</a></th><td>mod_cache</td></tr></table>
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<p>Percentage of download to arrive for the cache to force complete transfer.</p>
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<div class="example"><p><code>
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CacheForceCompletion 80
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</code></p></div>
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<div class="warning">
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This feature is currently <em>not</em> implemented.
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</div>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><div class="directive-section"><h2><a name="CacheIgnoreCacheControl" id="CacheIgnoreCacheControl">CacheIgnoreCacheControl</a> <a name="cacheignorecachecontrol" id="cacheignorecachecontrol">Directive</a></h2><table class="directive"><tr><th><a href="directive-dict.html#Description">Description:
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</a></th><td>Ignore requests from the client for uncached
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content</td></tr><tr><th><a href="directive-dict.html#Syntax">Syntax:
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</a></th><td><code>CacheIgnoreCacheControl On|Off</code></td></tr><tr><th><a href="directive-dict.html#Default">Default:
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</a></th><td><code>CacheIgnoreCacheControl Off</code></td></tr><tr><th><a href="directive-dict.html#Context">Context:
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</a></th><td>server config, virtual host</td></tr><tr><th><a href="directive-dict.html#Status">Status:
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</a></th><td>Experimental</td></tr><tr><th><a href="directive-dict.html#Module">Module:
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</a></th><td>mod_cache</td></tr></table>
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<p>Ignore requests from the client for uncached content</p>
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<div class="example"><p><code>
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CacheIgnoreCacheControl On
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</code></p></div>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><div class="directive-section"><h2><a name="CacheIgnoreNoLastMod" id="CacheIgnoreNoLastMod">CacheIgnoreNoLastMod</a> <a name="cacheignorenolastmod" id="cacheignorenolastmod">Directive</a></h2><table class="directive"><tr><th><a href="directive-dict.html#Description">Description:
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</a></th><td>Ignore responses where there is no Last Modified
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Header</td></tr><tr><th><a href="directive-dict.html#Syntax">Syntax:
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</a></th><td><code>CacheIgnoreNoLastMod On|Off</code></td></tr><tr><th><a href="directive-dict.html#Default">Default:
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</a></th><td><code>CacheIgnoreNoLastMod Off</code></td></tr><tr><th><a href="directive-dict.html#Context">Context:
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</a></th><td>server config, virtual host</td></tr><tr><th><a href="directive-dict.html#Status">Status:
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</a></th><td>Experimental</td></tr><tr><th><a href="directive-dict.html#Module">Module:
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</a></th><td>mod_cache</td></tr></table>
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<p>Ignore responses where there is no Last Modified Header.</p>
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<div class="example"><p><code>
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CacheIgnoreNoLastMod On
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</code></p></div>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><div class="directive-section"><h2><a name="CacheLastModifiedFactor" id="CacheLastModifiedFactor">CacheLastModifiedFactor</a> <a name="cachelastmodifiedfactor" id="cachelastmodifiedfactor">Directive</a></h2><table class="directive"><tr><th><a href="directive-dict.html#Description">Description:
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</a></th><td>The factor used to estimate the Expires date from the
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LastModified date</td></tr><tr><th><a href="directive-dict.html#Syntax">Syntax:
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||
</a></th><td><code>CacheLastModifiedFactor <var>float</var></code></td></tr><tr><th><a href="directive-dict.html#Default">Default:
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||
</a></th><td><code>CacheLastModifiedFactor 0.1</code></td></tr><tr><th><a href="directive-dict.html#Context">Context:
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||
</a></th><td>server config, virtual host</td></tr><tr><th><a href="directive-dict.html#Status">Status:
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||
</a></th><td>Experimental</td></tr><tr><th><a href="directive-dict.html#Module">Module:
|
||
</a></th><td>mod_cache</td></tr></table>
|
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<p>The factor used to estimate the Expires date from the LastModified date.</p>
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<div class="example"><p><code>
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CacheLastModifiedFactor 0.5
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</code></p></div>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><div class="directive-section"><h2><a name="CacheMaxExpire" id="CacheMaxExpire">CacheMaxExpire</a> <a name="cachemaxexpire" id="cachemaxexpire">Directive</a></h2><table class="directive"><tr><th><a href="directive-dict.html#Description">Description:
|
||
</a></th><td>The maximum time in seconds to cache a document</td></tr><tr><th><a href="directive-dict.html#Syntax">Syntax:
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||
</a></th><td><code>CacheMaxExpire <var>seconds</var></code></td></tr><tr><th><a href="directive-dict.html#Default">Default:
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||
</a></th><td><code>CacheMaxExpire 86400 (one day)</code></td></tr><tr><th><a href="directive-dict.html#Context">Context:
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||
</a></th><td>server config, virtual host</td></tr><tr><th><a href="directive-dict.html#Status">Status:
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||
</a></th><td>Experimental</td></tr><tr><th><a href="directive-dict.html#Module">Module:
|
||
</a></th><td>mod_cache</td></tr></table>
|
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<p>The maximum time in seconds to cache a document. The
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<code class="directive">CacheMaxExpire</code> takes precedence over the
|
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<code>Expires</code> field from the header.</p>
|
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<div class="example"><p><code>
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CacheMaxExpire 604800
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</code></p></div>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><div class="directive-section"><h2><a name="CacheMaxStreamingBuffer" id="CacheMaxStreamingBuffer">CacheMaxStreamingBuffer</a> <a name="cachemaxstreamingbuffer" id="cachemaxstreamingbuffer">Directive</a></h2><table class="directive"><tr><th><a href="directive-dict.html#Description">Description:
|
||
</a></th><td>Maximum amount of a streamed response to buffer in memory
|
||
before declaring the response uncacheable</td></tr><tr><th><a href="directive-dict.html#Syntax">Syntax:
|
||
</a></th><td><code>CacheMaxStreamingBuffer <var>size_in_bytes</var></code></td></tr><tr><th><a href="directive-dict.html#Default">Default:
|
||
</a></th><td><code>CacheMaxStreamingBuffer 0</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_cache</td></tr></table>
|
||
<p>Maximum number of bytes of a streamed response (<em>i.e.</em>, a
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response where the entire content is not available all at once, such
|
||
as a proxy or CGI response) to buffer before deciding if the response
|
||
is cacheable. By default, a streamed response will <em>not</em> be
|
||
cached unless it has a <code>Content-Length</code> header. The reason
|
||
for this is to avoid using a large amount of memory to buffer a partial
|
||
response that might end up being too large to fit in the cache anyway.
|
||
To enable caching of streamed responses, use <code class="directive">CacheMaxStreamingBuffer</code> to specify the maximum amount of
|
||
buffer space to use per request.</p>
|
||
|
||
<div class="note"><h3>Note:</h3>
|
||
<p>Using a nonzero value for <code class="directive">CacheMaxStreamingBuffer</code> will not delay the transmission
|
||
of the response to the client. As soon as <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code>
|
||
copies a block of streamed content into a buffer, it sends the block
|
||
on to the next output filter for delivery to the client.</p>
|
||
</div>
|
||
|
||
<div class="example"><p><code>
|
||
# Enable caching of streamed responses up to 64KB:<br />
|
||
CacheMaxStreamingBuffer 65536
|
||
</code></p></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><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></div></body></html> |