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25 <div id="preamble"><h1>Apache Module mod_buffer</h1>
27 <p><span>Available Languages: </span><a href="../en/mod/mod_buffer.html" title="English"> en </a> |
28 <a href="../fr/mod/mod_buffer.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p>
30 <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Support for request buffering</td></tr>
31 <tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
32 <tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>buffer_module</td></tr>
33 <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_buffer.c</td></tr>
34 <tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.3 and later</td></tr></table>
37 <p>This module provides the ability to buffer the input and output
40 <p>Under certain circumstances, content generators might create
41 content in small chunks. In order to promote memory reuse, in
42 memory chunks are always 8k in size, regardless of the size of the
43 chunk itself. When many small chunks are generated by a request,
44 this can create a large memory footprint while the request is
45 being processed, and an unnecessarily large amount of data on the
46 wire. The addition of a buffer collapses the response into the
47 fewest chunks possible.</p>
49 <p>When httpd is used in front of an expensive content generator,
50 buffering the response may allow the backend to complete
51 processing and release resources sooner, depending on how the
52 backend is designed.</p>
54 <p>The buffer filter may be added to either the input or the
55 output filter stacks, as appropriate, using the
56 <code class="directive"><a href="../mod/core.html#setinputfilter">SetInputFilter</a></code>,
57 <code class="directive"><a href="../mod/core.html#setoutputfilter">SetOutputFilter</a></code>,
58 <code class="directive"><a href="../mod/mod_mime.html#addoutputfilter">AddOutputFilter</a></code> or
59 <code class="directive"><a href="../mod/mod_filter.html#addoutputfilterbytype">AddOutputFilterByType</a></code> directives.</p>
61 <div class="example"><h3>Using buffer with mod_include</h3><pre class="prettyprint lang-config">
62 AddOutputFilterByType INCLUDES;BUFFER text/html
66 <div class="warning">The buffer filters read the request/response into
67 RAM and then repack the request/response into the fewest memory
68 buckets possible, at the cost of CPU time. When the request/response
69 is already efficiently packed, buffering the request/response could
70 cause the request/response to be slower than not using a buffer at
71 all. These filters should be used with care, and only where
75 <div id="quickview"><h3 class="directives">Directives</h3>
77 <li><img alt="" src="../images/down.gif" /> <a href="#buffersize">BufferSize</a></li>
81 <li><a href="../filter.html">Filters</a></li>
82 </ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
84 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
85 <div class="directive-section"><h2><a name="BufferSize" id="BufferSize">BufferSize</a> <a name="buffersize" id="buffersize">Directive</a></h2>
86 <table class="directive">
87 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maximum size in bytes to buffer by the buffer filter</td></tr>
88 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>BufferSize integer</code></td></tr>
89 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>BufferSize 131072</code></td></tr>
90 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
91 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
92 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_buffer</td></tr>
94 <p>The <code class="directive"><a href="#buffersize">BufferSize</a></code>
95 directive specifies the amount of data in bytes that will be
96 buffered before being read from or written to each request.
97 The default is 128 kilobytes.</p>
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102 <p><span>Available Languages: </span><a href="../en/mod/mod_buffer.html" title="English"> en </a> |
103 <a href="../fr/mod/mod_buffer.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p>
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