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<p class="apache">Apache HTTP Server Version 2.4</p>
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<a href="https://www.apache.org/">Apache</a> > <a href="https://httpd.apache.org/">HTTP Server</a> > <a href="https://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.4</a> > <a href="./">Modules</a></div>
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<div id="preamble"><h1>Apache Module mod_cache_socache</h1>
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<p><span>Available Languages: </span><a href="../en/mod/mod_cache_socache.html" title="English"> en </a> |
<a href="../fr/mod/mod_cache_socache.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p>
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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
HTTP caching filter.</td></tr>
<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>cache_socache_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_cache_socache.c</td></tr></table>
<h3>Summary</h3>
<p><code class="module"><a href="../mod/mod_cache_socache.html">mod_cache_socache</a></code> implements a shared object cache
(socache) based storage manager for <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code>.</p>
<p>The headers and bodies of cached responses are combined, and stored
underneath a single key in the shared object cache. A
<a href="../socache.html">number of implementations</a> of shared object
caches are available to choose from.</p>
<p>Multiple content negotiated responses can be stored concurrently,
however the caching of partial content is not yet supported by this
module.</p>
<pre class="prettyprint lang-config"># Turn on caching
CacheSocache shmcb
CacheSocacheMaxSize 102400
<Location "/foo">
CacheEnable socache
</Location>
# Fall back to the disk cache
CacheSocache shmcb
CacheSocacheMaxSize 102400
<Location "/foo">
CacheEnable socache
CacheEnable disk
</Location></pre>
<div class="note"><h3>Note:</h3>
<p><code class="module"><a href="../mod/mod_cache_socache.html">mod_cache_socache</a></code> requires the services of
<code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code>, which must be loaded before
<code class="module"><a href="../mod/mod_cache_socache.html">mod_cache_socache</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="#cachesocache">CacheSocache</a></li>
<li><img alt="" src="../images/down.gif"> <a href="#cachesocachemaxsize">CacheSocacheMaxSize</a></li>
<li><img alt="" src="../images/down.gif"> <a href="#cachesocachemaxtime">CacheSocacheMaxTime</a></li>
<li><img alt="" src="../images/down.gif"> <a href="#cachesocachemintime">CacheSocacheMinTime</a></li>
<li><img alt="" src="../images/down.gif"> <a href="#cachesocachereadsize">CacheSocacheReadSize</a></li>
<li><img alt="" src="../images/down.gif"> <a href="#cachesocachereadtime">CacheSocacheReadTime</a></li>
</ul>
<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>
<ul class="seealso">
<li><code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code></li>
<li><code class="module"><a href="../mod/mod_cache_disk.html">mod_cache_disk</a></code></li>
<li><a href="../caching.html">Caching Guide</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 id="cachesocache"><span id="CacheSocache">CacheSocache</span> Directive <a title="Permanent link" href="#cachesocache" class="permalink">¶</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The shared object cache implementation to use</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheSocache <var>type[:args]</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>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache_socache</td></tr>
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.4.5 and later</td></tr>
</table>
<p>The <code class="directive">CacheSocache</code> directive defines the name of
the shared object cache implementation to use, followed by optional
arguments for that implementation. A <a href="../socache.html">number of
implementations</a> of shared object caches are available to choose
from.</p>
<pre class="prettyprint lang-config">CacheSocache shmcb</pre>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif"></a></div>
<div class="directive-section"><h2 id="cachesocachemaxsize"><span id="CacheSocacheMaxSize">CacheSocacheMaxSize</span> Directive <a title="Permanent link" href="#cachesocachemaxsize" class="permalink">¶</a></h2>
<table class="directive">
<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
cache</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheSocacheMaxSize <var>bytes</var></code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheSocacheMaxSize 102400</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache_socache</td></tr>
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.4.5 and later</td></tr>
</table>
<p>The <code class="directive">CacheSocacheMaxSize</code> directive sets the
maximum size, in bytes, for the combined headers and body of a document
to be considered for storage in the cache. The value must be at
least 1024 bytes. The larger the headers that
are stored alongside the body, the smaller the body may be.</p>
<p>The <code class="module"><a href="../mod/mod_cache_socache.html">mod_cache_socache</a></code> module will only attempt to
cache responses that have an explicit content length, or that are small
enough to be written in one pass. This is done to allow the
<code class="module"><a href="../mod/mod_cache_disk.html">mod_cache_disk</a></code> module to have an opportunity to cache
responses larger than those cacheable within
<code class="module"><a href="../mod/mod_cache_socache.html">mod_cache_socache</a></code>.</p>
<pre class="prettyprint lang-config">CacheSocacheMaxSize 102400</pre>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif"></a></div>
<div class="directive-section"><h2 id="cachesocachemaxtime"><span id="CacheSocacheMaxTime">CacheSocacheMaxTime</span> Directive <a title="Permanent link" href="#cachesocachemaxtime" class="permalink">¶</a></h2>
<table class="directive">
<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
cache</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheSocacheMaxTime <var>seconds</var></code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheSocacheMaxTime 86400</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache_socache</td></tr>
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.4.5 and later</td></tr>
</table>
<p>The <code class="directive">CacheSocacheMaxTime</code> directive sets the
maximum freshness lifetime, in seconds, for a document to be stored in
the cache. This value overrides the freshness lifetime defined for the
document by the HTTP protocol.</p>
<pre class="prettyprint lang-config">CacheSocacheMaxTime 86400</pre>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif"></a></div>
<div class="directive-section"><h2 id="cachesocachemintime"><span id="CacheSocacheMinTime">CacheSocacheMinTime</span> Directive <a title="Permanent link" href="#cachesocachemintime" class="permalink">¶</a></h2>
<table class="directive">
<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
cache</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheSocacheMinTime <var>seconds</var></code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheSocacheMinTime 600</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache_socache</td></tr>
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.4.5 and later</td></tr>
</table>
<p>The <code class="directive">CacheSocacheMinTime</code> directive sets the
amount of seconds beyond the freshness lifetime of the response that the
response should be cached for in the shared object cache. If a response is
only stored for its freshness lifetime, there will be no opportunity to
revalidate the response to make it fresh again.</p>
<pre class="prettyprint lang-config">CacheSocacheMinTime 600</pre>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif"></a></div>
<div class="directive-section"><h2 id="cachesocachereadsize"><span id="CacheSocacheReadSize">CacheSocacheReadSize</span> Directive <a title="Permanent link" href="#cachesocachereadsize" class="permalink">¶</a></h2>
<table class="directive">
<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
before sending the data downstream</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheSocacheReadSize <var>bytes</var></code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheSocacheReadSize 0</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache_socache</td></tr>
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.4.5 and later</td></tr>
</table>
<p>The <code class="directive">CacheSocacheReadSize</code> directive sets the
minimum amount of data, in bytes, to be read from the backend before the
data is sent to the client. The default of zero causes all data read of
any size to be passed downstream to the client immediately as it arrives.
Setting this to a higher value causes the disk cache to buffer at least
this amount before sending the result to the client. This can improve
performance when caching content from a slow reverse proxy.</p>
<p>This directive only takes effect when the data is being saved to the
cache, as opposed to data being served from the cache.</p>
<pre class="prettyprint lang-config">CacheSocacheReadSize 102400</pre>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif"></a></div>
<div class="directive-section"><h2 id="cachesocachereadtime"><span id="CacheSocacheReadTime">CacheSocacheReadTime</span> Directive <a title="Permanent link" href="#cachesocachereadtime" class="permalink">¶</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The minimum time (in milliseconds) that should elapse while reading
before data is sent downstream</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheSocacheReadTime <var>milliseconds</var></code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheSocacheReadTime 0</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache_socache</td></tr>
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.4.5 and later</td></tr>
</table>
<p>The <code class="directive">CacheSocacheReadTime</code> directive sets the minimum amount
of elapsed time that should pass before making an attempt to send data
downstream to the client. During the time period, data will be buffered
before sending the result to the client. This can improve performance when
caching content from a reverse proxy.</p>
<p>The default of zero disables this option.</p>
<p>This directive only takes effect when the data is being saved to the
cache, as opposed to data being served from the cache. It is recommended
that this option be used alongside the
<code class="directive"><a href="#cachesocachereadsize">CacheSocacheReadSize</a></code> directive
to ensure that the server does not buffer excessively should data arrive faster
than expected.</p>
<pre class="prettyprint lang-config">CacheSocacheReadTime 1000</pre>
</div>
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