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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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<title>mod_cache_socache - Apache HTTP Server Version 2.5</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="../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/quickreference.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>
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<p class="apache">Apache HTTP Server Version 2.5</p>
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<img alt="" src="../images/feather.png" /></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/">Documentation</a> > <a href="../">Version 2.5</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_cache_socache</h1>
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<div class="toplang">
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<p><span>Available Languages: </span><a href="../en/mod/mod_cache_socache.html" title="English"> en </a> |
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<a href="../fr/mod/mod_cache_socache.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p>
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</div>
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<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Shared object cache (socache) based storage module for the
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HTTP caching filter.</td></tr>
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<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
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<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>cache_socache_module</td></tr>
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<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_cache_socache.c</td></tr></table>
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<h3>Summary</h3>
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<p><code class="module"><a href="../mod/mod_cache_socache.html">mod_cache_socache</a></code> implements a shared object cache
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(socache) based storage manager for <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code>.</p>
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<p>The headers and bodies of cached responses are combined, and stored
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underneath a single key in the shared object cache. A
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<a href="../socache.html">number of implementations</a> of shared object
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caches are available to choose from.</p>
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<p>Multiple content negotiated responses can be stored concurrently,
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however the caching of partial content is not yet supported by this
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module.</p>
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<pre class="prettyprint lang-config"># Turn on caching
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CacheSocache shmcb
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CacheSocacheMaxSize 102400
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<Location "/foo">
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CacheEnable socache
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</Location>
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# Fall back to the disk cache
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CacheSocache shmcb
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CacheSocacheMaxSize 102400
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<Location "/foo">
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CacheEnable socache
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CacheEnable disk
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</Location></pre>
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<div class="note"><h3>Note:</h3>
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<p><code class="module"><a href="../mod/mod_cache_socache.html">mod_cache_socache</a></code> requires the services of
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<code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code>, which must be loaded before
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<code class="module"><a href="../mod/mod_cache_socache.html">mod_cache_socache</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="#cachesocache">CacheSocache</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#cachesocachemaxsize">CacheSocacheMaxSize</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#cachesocachemaxtime">CacheSocacheMaxTime</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#cachesocachemintime">CacheSocacheMinTime</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#cachesocachereadsize">CacheSocacheReadSize</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#cachesocachereadtime">CacheSocacheReadTime</a></li>
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</ul>
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<h3>Bugfix checklist</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">httpd changelog</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&list_id=144532&product=Apache%20httpd-2&query_format=specific&order=changeddate%20DESC%2Cpriority%2Cbug_severity&component=mod_cache_socache">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_cache_socache">Report a bug</a></li></ul><h3>See also</h3>
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<ul class="seealso">
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<li><code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code></li>
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<li><code class="module"><a href="../mod/mod_cache_disk.html">mod_cache_disk</a></code></li>
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<li><a href="../caching.html">Caching Guide</a></li>
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<li><a href="#comments_section">Comments</a></li></ul></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="CacheSocache" id="CacheSocache">CacheSocache</a> <a name="cachesocache" id="cachesocache">Directive</a> <a title="Permanent link" href="#cachesocache" class="permalink">¶</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 shared object cache implementation to use</td></tr>
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<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheSocache <var>type[:args]</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>Extension</td></tr>
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<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache_socache</td></tr>
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<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.4.5 and later</td></tr>
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</table>
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<p>The <code class="directive">CacheSocache</code> directive defines the name of
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the shared object cache implementation to use, followed by optional
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arguments for that implementation. A <a href="../socache.html">number of
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implementations</a> of shared object caches are available to choose
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from.</p>
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<pre class="prettyprint lang-config">CacheSocache shmcb</pre>
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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="CacheSocacheMaxSize" id="CacheSocacheMaxSize">CacheSocacheMaxSize</a> <a name="cachesocachemaxsize" id="cachesocachemaxsize">Directive</a> <a title="Permanent link" href="#cachesocachemaxsize" class="permalink">¶</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 size (in bytes) of an entry to be placed 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>CacheSocacheMaxSize <var>bytes</var></code></td></tr>
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<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheSocacheMaxSize 102400</code></td></tr>
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<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
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<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
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<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache_socache</td></tr>
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<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.4.5 and later</td></tr>
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</table>
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<p>The <code class="directive">CacheSocacheMaxSize</code> directive sets the
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maximum size, in bytes, for the combined headers and body of a document
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to be considered for storage in the cache. The larger the headers that
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are stored alongside the body, the smaller the body may be.</p>
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<p>The <code class="module"><a href="../mod/mod_cache_socache.html">mod_cache_socache</a></code> module will only attempt to
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cache responses that have an explicit content length, or that are small
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enough to be written in one pass. This is done to allow the
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<code class="module"><a href="../mod/mod_cache_disk.html">mod_cache_disk</a></code> module to have an opportunity to cache
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responses larger than those cacheable within
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<code class="module"><a href="../mod/mod_cache_socache.html">mod_cache_socache</a></code>.</p>
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<pre class="prettyprint lang-config">CacheSocacheMaxSize 102400</pre>
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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="CacheSocacheMaxTime" id="CacheSocacheMaxTime">CacheSocacheMaxTime</a> <a name="cachesocachemaxtime" id="cachesocachemaxtime">Directive</a> <a title="Permanent link" href="#cachesocachemaxtime" class="permalink">¶</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 time (in seconds) for a document to be placed 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>CacheSocacheMaxTime <var>seconds</var></code></td></tr>
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<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheSocacheMaxTime 86400</code></td></tr>
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<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
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<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
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<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache_socache</td></tr>
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<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.4.5 and later</td></tr>
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</table>
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<p>The <code class="directive">CacheSocacheMaxTime</code> directive sets the
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maximum freshness lifetime, in seconds, for a document to be stored in
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the cache. This value overrides the freshness lifetime defined for the
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document by the HTTP protocol.</p>
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<pre class="prettyprint lang-config">CacheSocacheMaxTime 86400</pre>
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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="CacheSocacheMinTime" id="CacheSocacheMinTime">CacheSocacheMinTime</a> <a name="cachesocachemintime" id="cachesocachemintime">Directive</a> <a title="Permanent link" href="#cachesocachemintime" class="permalink">¶</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 minimum time (in seconds) for a document to be placed 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>CacheSocacheMinTime <var>seconds</var></code></td></tr>
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<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheSocacheMinTime 600</code></td></tr>
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<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
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<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
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<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache_socache</td></tr>
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<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.4.5 and later</td></tr>
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</table>
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<p>The <code class="directive">CacheSocacheMinTime</code> directive sets the
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amount of seconds beyond the freshness lifetime of the response that the
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response should be cached for in the shared object cache. If a response is
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only stored for its freshness lifetime, there will be no opportunity to
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revalidate the response to make it fresh again.</p>
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<pre class="prettyprint lang-config">CacheSocacheMinTime 600</pre>
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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="CacheSocacheReadSize" id="CacheSocacheReadSize">CacheSocacheReadSize</a> <a name="cachesocachereadsize" id="cachesocachereadsize">Directive</a> <a title="Permanent link" href="#cachesocachereadsize" class="permalink">¶</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 minimum size (in bytes) of the document to read and be cached
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before sending the data downstream</td></tr>
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<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheSocacheReadSize <var>bytes</var></code></td></tr>
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<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheSocacheReadSize 0</code></td></tr>
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<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
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<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
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<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache_socache</td></tr>
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<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.4.5 and later</td></tr>
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</table>
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<p>The <code class="directive">CacheSocacheReadSize</code> directive sets the
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minimum amount of data, in bytes, to be read from the backend before the
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data is sent to the client. The default of zero causes all data read of
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any size to be passed downstream to the client immediately as it arrives.
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Setting this to a higher value causes the disk cache to buffer at least
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this amount before sending the result to the client. This can improve
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performance when caching content from a slow reverse proxy.</p>
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<p>This directive only takes effect when the data is being saved to the
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cache, as opposed to data being served from the cache.</p>
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<pre class="prettyprint lang-config">CacheSocacheReadSize 102400</pre>
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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="CacheSocacheReadTime" id="CacheSocacheReadTime">CacheSocacheReadTime</a> <a name="cachesocachereadtime" id="cachesocachereadtime">Directive</a> <a title="Permanent link" href="#cachesocachereadtime" class="permalink">¶</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 minimum time (in milliseconds) that should elapse while reading
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before data is sent downstream</td></tr>
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<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheSocacheReadTime <var>milliseconds</var></code></td></tr>
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<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheSocacheReadTime 0</code></td></tr>
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<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
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<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
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<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache_socache</td></tr>
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<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.4.5 and later</td></tr>
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</table>
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<p>The <code class="directive">CacheSocacheReadTime</code> directive sets the minimum amount
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of elapsed time that should pass before making an attempt to send data
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downstream to the client. During the time period, data will be buffered
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before sending the result to the client. This can improve performance when
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caching content from a reverse proxy.</p>
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<p>The default of zero disables this option.</p>
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<p>This directive only takes effect when the data is being saved to the
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cache, as opposed to data being served from the cache. It is recommended
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||
that this option be used alongside the
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<code class="directive"><a href="#cachesocachereadsize">CacheSocacheReadSize</a></code> directive
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to ensure that the server does not buffer excessively should data arrive faster
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than expected.</p>
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<pre class="prettyprint lang-config">CacheSocacheReadTime 1000</pre>
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</div>
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</div>
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<div class="bottomlang">
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<p><span>Available Languages: </span><a href="../en/mod/mod_cache_socache.html" title="English"> en </a> |
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<a href="../fr/mod/mod_cache_socache.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p>
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</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 by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Libera.chat, or sent to our <a href="https://httpd.apache.org/lists.html">mailing lists</a>.</div>
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