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+<div id="page-content">
+<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">&nbsp;en&nbsp;</a> |
+<a href="../fr/mod/mod_buffer.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a></p>
+</div>
+<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#Status">Status:</a></th><td>Extension</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#SourceFile">Source File:</a></th><td>mod_buffer.c</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/core.html#setinputfilter">SetInputFilter</a></code>,
+ <code class="directive"><a href="../mod/core.html#setoutputfilter">SetOutputFilter</a></code>,
+ <code class="directive"><a href="../mod/mod_mime.html#addoutputfilter">AddOutputFilter</a></code> or
+ <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>
+</div>
+
+ <div class="warning">The buffer filters read the request/response into
+ RAM and then repack the request/response into the fewest memory
+ buckets possible, at the cost of CPU time. When the request/response
+ is already efficiently packed, buffering the request/response could
+ cause the request/response to be slower than not using a buffer at
+ all. These filters should be used with care, and only where
+ necessary.</div>
+
+</div>
+<div id="quickview"><a href="https://www.apache.org/foundation/contributing.html" class="badge"><img src="https://www.apache.org/images/SupportApache-small.png" alt="Support Apache!" /></a><h3 class="directives">Directives</h3>
+<ul id="toc">
+<li><img alt="" src="../images/down.gif" /> <a href="#buffersize">BufferSize</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__&amp;list_id=144532&amp;product=Apache%20httpd-2&amp;query_format=specific&amp;order=changeddate%20DESC%2Cpriority%2Cbug_severity&amp;component=mod_buffer">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&amp;component=mod_buffer">Report a bug</a></li></ul><h3>See also</h3>
+<ul class="seealso">
+<li><a href="../filter.html">Filters</a></li>
+<li><a href="#comments_section">Comments</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="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>
+<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_buffer</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>
+
+</div>
+</div>
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+<p><span>Available Languages: </span><a href="../en/mod/mod_buffer.html" title="English">&nbsp;en&nbsp;</a> |
+<a href="../fr/mod/mod_buffer.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a></p>
+</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&amp;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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