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<div id="preamble"><h1>Apache Module mod_buffer</h1>
<div class="toplang">
<p><span>Available Languages: </span><a href="/en/mod/mod_buffer.html" title="English"> en </a> |
<a href="/fr/mod/mod_buffer.html" hreflang="fr" rel="alternate" title="Fran�ais"> fr </a></p>
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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>
<tr><th><a href="module-dict.html#ModuleIdentifier">Module�Identifier:</a></th><td>buffer_module</td></tr>
<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.3 and later</td></tr></table>
<h3>Summary</h3>
<p>This module provides the ability to buffer the input and output
filter stacks.</p>
<p>Under certain circumstances, content generators might create
content in small chunks. In order to promote memory reuse, in
memory chunks are always 8k in size, regardless of the size of the
chunk itself. When many small chunks are generated by a request,
this can create a large memory footprint while the request is
being processed, and an unnecessarily large amount of data on the
wire. The addition of a buffer collapses the response into the
fewest chunks possible.</p>
<p>When httpd is used in front of an expensive content generator,
buffering the response may allow the backend to complete
processing and release resources sooner, depending on how the
backend is designed.</p>
<p>The buffer filter may be added to either the input or the
output filter stacks, as appropriate, using the
<code class="directive"><a href="/mod/mod_filter.html#addoutputfilterbytype">AddOutputFilterByType</a></code> directives.</p>
<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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all. These filters should be used with care, and only where
necessary.</div>
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<div id="quickview"><h3 class="directives">Directives</h3>
<ul id="toc">
</ul>
<h3>See also</h3>
<ul class="seealso">
</ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
<div class="directive-section"><h2><a name="BufferSize" id="BufferSize">BufferSize</a> <a name="buffersize" id="buffersize">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maximum size in bytes to buffer by the buffer filter</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>BufferSize integer</code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>BufferSize 131072</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
</table>
<p>The <code class="directive"><a href="#buffersize">BufferSize</a></code>
directive specifies the amount of data in bytes that will be
buffered before being read from or written to each request.
The default is 128 kilobytes.</p>
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