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-<title>mod_disk_cache - Apache HTTP Server</title>
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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>
-<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/">Documentation</a> > <a href="../">Version 2.0</a> > <a href="./">Modules</a></div>
-<div id="page-content">
-<div id="preamble"><h1>Apache Module mod_disk_cache</h1>
-<div class="toplang">
-<p><span>Available Languages: </span><a href="../en/mod/mod_disk_cache.html" title="English"> en </a> |
-<a href="../ko/mod/mod_disk_cache.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>Content cache storage manager keyed to URIs</td></tr>
-<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
-<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>disk_cache_module</td></tr>
-<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_disk_cache.c</td></tr></table>
-<h3>Summary</h3>
-
- <div class="warning">
- This module is experimental. Documentation is still under development...
- </div>
-
- <p><code class="module"><a href="../mod/mod_disk_cache.html">mod_disk_cache</a></code> implements a disk based storage
- manager. It is primarily of use in conjunction with
- <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code>.</p>
-
- <p>Content is stored in and retrieved from the cache using URI based
- keys. Content with access protection is not cached.</p>
-
- <div class="note"><h3>Note:</h3>
- <p><code class="module"><a href="../mod/mod_disk_cache.html">mod_disk_cache</a></code> requires the services of
- <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code>.</p>
- </div>
-</div>
-<div id="quickview"><h3 class="directives">Directives</h3>
-<ul id="toc">
-<li><img alt="" src="../images/down.gif" /> <a href="#cachedirlength">CacheDirLength</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#cachedirlevels">CacheDirLevels</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#cacheexpirycheck">CacheExpiryCheck</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#cachegcclean">CacheGcClean</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#cachegcdaily">CacheGcDaily</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#cachegcinterval">CacheGcInterval</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#cachegcmemusage">CacheGcMemUsage</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#cachegcunused">CacheGcUnused</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#cachemaxfilesize">CacheMaxFileSize</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#cacheminfilesize">CacheMinFileSize</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#cacheroot">CacheRoot</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#cachesize">CacheSize</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#cachetimemargin">CacheTimeMargin</a></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="CacheDirLength" id="CacheDirLength">CacheDirLength</a> <a name="cachedirlength" id="cachedirlength">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The number of characters in subdirectory names</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheDirLength <var>length</var></code></td></tr>
-<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheDirLength 2</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">CacheDirLength</code> directive sets the number
- of characters for each subdirectory name in the cache hierarchy.</p>
-
- <div class="note">
- <p>The result of <code class="directive"><a href="#cachedirlevels">CacheDirLevels</a></code>* <code class="directive">CacheDirLength</code>
- must not be higher than 20.</p>
- </div>
-
- <div class="example"><p><code>
- CacheDirLength 4
- </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="CacheDirLevels" id="CacheDirLevels">CacheDirLevels</a> <a name="cachedirlevels" id="cachedirlevels">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The number of levels of subdirectories in the
-cache.</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheDirLevels <var>levels</var></code></td></tr>
-<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheDirLevels 3</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">CacheDirLevels</code> directive sets the number
- of subdirectory levels in the cache. Cached data will be saved this
- many directory levels below the <code class="directive"><a href="#cacheroot">CacheRoot</a></code> directory.</p>
-
- <div class="note">
- <p>The result of <code class="directive">CacheDirLevels</code>*
- <code class="directive"><a href="#cachedirlength">CacheDirLength</a></code> must
- not be higher than 20.</p>
- </div>
-
- <div class="example"><p><code>
- CacheDirLevels 5
- </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="CacheExpiryCheck" id="CacheExpiryCheck">CacheExpiryCheck</a> <a name="cacheexpirycheck" id="cacheexpirycheck">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Indicates if the cache observes Expires dates when seeking
-files</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheExpiryCheck On|Off</code></td></tr>
-<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheExpiryCheck On</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>
- CacheExpiryCheck Off<br />
- </code></p></div>
-
- <div class="warning">
- The <code class="directive">CacheExpiryCheck</code> directive is currently
- <em>not</em> implemented.
- </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="CacheGcClean" id="CacheGcClean">CacheGcClean</a> <a name="cachegcclean" id="cachegcclean">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The time to retain unchanged cached files that match a
-URL</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheGcClean <var>hours</var> <var>url-string</var></code></td></tr>
-<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheGcClean ?</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>
- CacheGcClean 12 /daily_scripts
- </code></p></div>
-
- <div class="warning">
- The <code class="directive">CacheGcClean</code> directive is currently
- <em>not</em> implemented.
- </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="CacheGcDaily" id="CacheGcDaily">CacheGcDaily</a> <a name="cachegcdaily" id="cachegcdaily">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The recurring time each day for garbage collection to be run.
-(24 hour clock)</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheGcDaily <var>time</var></code></td></tr>
-<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheGcDaily ?</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>
- CacheGcDaily 23:59
- </code></p></div>
-
- <div class="warning">
- The <code class="directive">CacheGcDaily</code> directive is currently
- <em>not</em> implemented.
- </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="CacheGcInterval" id="CacheGcInterval">CacheGcInterval</a> <a name="cachegcinterval" id="cachegcinterval">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The interval between garbage collection attempts.</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheGcInterval <var>hours</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>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">CacheGcInterval</code> directive specifies the
- number of hours to wait between attempts to free up disk space.</p>
- <p>More detail will be added here, when the function is implemented.</p>
-
- <div class="example"><p><code>
- CacheGcInterval 24<br />
- </code></p></div>
-
- <div class="warning">
- The <code class="directive">CacheGcInterval</code> directive is currently
- <em>not</em> implemented.
- </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="CacheGcMemUsage" id="CacheGcMemUsage">CacheGcMemUsage</a> <a name="cachegcmemusage" id="cachegcmemusage">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The maximum kilobytes of memory used for garbage
-collection</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheGcMemUsage <var>KBytes</var></code></td></tr>
-<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheGcMemUsage ?</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>
- CacheGcMemUsage 16
- </code></p></div>
-
- <div class="warning">
- The <code class="directive">CacheGcMemUsage</code> directive is currently
- <em>not</em> implemented.
- </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="CacheGcUnused" id="CacheGcUnused">CacheGcUnused</a> <a name="cachegcunused" id="cachegcunused">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The time to retain unreferenced cached files that match a
-URL.</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheGcUnused <var>hours</var> <var>url-string</var></code></td></tr>
-<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheGcUnused ?</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>
- CacheGcUnused 12 /local_images
- </code></p></div>
-
- <div class="warning">
- The <code class="directive">CacheGcUnused</code> directive is currently
- <em>not</em> implemented.
- </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="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>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheMaxFileSize <var>bytes</var></code></td></tr>
-<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>
-<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">CacheMaxFileSize</code> directive sets the
- maximum size, in bytes, for a document to be considered for storage in
- the cache.</p>
-
- <div class="example"><p><code>
- CacheMaxFileSize 64000
- </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="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>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheMinFileSize <var>bytes</var></code></td></tr>
-<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheMinFileSize 1</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">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>
-<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#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 class="bottomlang">
-<p><span>Available Languages: </span><a href="../en/mod/mod_disk_cache.html" title="English"> en </a> |
-<a href="../ko/mod/mod_disk_cache.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p>
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