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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head>
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<meta content="text/html; charset=UTF-8" http-equiv="Content-Type" />
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<title>mod_buffer - 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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</script>
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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_buffer</h1>
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<div class="toplang">
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<p><span>Available Languages: </span><a href="../en/mod/mod_buffer.html" title="English"> en </a> |
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<a href="../fr/mod/mod_buffer.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>Support for request buffering</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>buffer_module</td></tr>
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<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_buffer.c</td></tr>
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<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.3 and later</td></tr></table>
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<h3>Summary</h3>
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<p>This module provides the ability to buffer the input and output
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filter stacks.</p>
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<p>Under certain circumstances, content generators might create
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content in small chunks. In order to promote memory reuse, in
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memory chunks are always 8k in size, regardless of the size of the
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chunk itself. When many small chunks are generated by a request,
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this can create a large memory footprint while the request is
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being processed, and an unnecessarily large amount of data on the
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wire. The addition of a buffer collapses the response into the
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fewest chunks possible.</p>
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<p>When httpd is used in front of an expensive content generator,
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buffering the response may allow the backend to complete
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processing and release resources sooner, depending on how the
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backend is designed.</p>
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<p>The buffer filter may be added to either the input or the
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output filter stacks, as appropriate, using the
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<code class="directive"><a href="../mod/core.html#setinputfilter">SetInputFilter</a></code>,
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<code class="directive"><a href="../mod/core.html#setoutputfilter">SetOutputFilter</a></code>,
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<code class="directive"><a href="../mod/mod_mime.html#addoutputfilter">AddOutputFilter</a></code> or
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<code class="directive"><a href="../mod/mod_filter.html#addoutputfilterbytype">AddOutputFilterByType</a></code> directives.</p>
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<div class="example"><h3>Using buffer with mod_include</h3><pre class="prettyprint lang-config">AddOutputFilterByType INCLUDES;BUFFER text/html</pre>
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</div>
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<div class="warning">The buffer filters read the request/response into
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RAM and then repack the request/response into the fewest memory
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buckets possible, at the cost of CPU time. When the request/response
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is already efficiently packed, buffering the request/response could
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cause the request/response to be slower than not using a buffer at
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all. These filters should be used with care, and only where
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necessary.</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="#buffersize">BufferSize</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_buffer">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_buffer">Report a bug</a></li></ul><h3>See also</h3>
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<ul class="seealso">
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<li><a href="../filter.html">Filters</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="BufferSize" id="BufferSize">BufferSize</a> <a name="buffersize" id="buffersize">Directive</a> <a title="Permanent link" href="#buffersize" 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>Maximum size in bytes to buffer by the buffer filter</td></tr>
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<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>BufferSize integer</code></td></tr>
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<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>BufferSize 131072</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_buffer</td></tr>
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</table>
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<p>The <code class="directive">BufferSize</code>
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directive specifies the amount of data in bytes that will be
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buffered before being read from or written to each request.
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The default is 128 kilobytes.</p>
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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_buffer.html" title="English"> en </a> |
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<a href="../fr/mod/mod_buffer.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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<p class="apache">Copyright 2023 The Apache Software Foundation.<br />Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p>
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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></div><script type="text/javascript"><!--//--><![CDATA[//><!--
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