1<?xml version="1.0" encoding="ISO-8859-1"?> 2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> 3<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><!-- 4 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 5 This file is generated from xml source: DO NOT EDIT 6 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 7 --> 8<title>mod_buffer - Apache HTTP Server</title> 9<link href="/style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" /> 10<link href="/style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" /> 11<link href="/style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /><link rel="stylesheet" type="text/css" href="/style/css/prettify.css" /> 12<script src="/style/scripts/prettify.min.js" type="text/javascript"> 13</script> 14 15<link href="/images/favicon.ico" rel="shortcut icon" /></head> 16<body> 17<div id="page-header"> 18<p class="menu"><a href="/mod/">Modules</a> | <a href="/mod/directives.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> 19<p class="apache">Apache HTTP Server Version 2.4</p> 20<img alt="" src="/images/feather.gif" /></div> 21<div class="up"><a href="./"><img title="<-" alt="<-" src="/images/left.gif" /></a></div> 22<div id="path"> 23<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 2.4</a> > <a href="./">Modules</a></div> 24<div id="page-content"> 25<div id="preamble"><h1>Apache Module mod_buffer</h1> 26<div class="toplang"> 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="Fran�ais"> fr </a></p> 29</div> 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> 35<h3>Summary</h3> 36 37 <p>This module provides the ability to buffer the input and output 38 filter stacks.</p> 39 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> 48 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> 53 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> 60 61 <div class="example"><h3>Using buffer with mod_include</h3><pre class="prettyprint lang-config">AddOutputFilterByType INCLUDES;BUFFER text/html</pre> 62</div> 63 64 <div class="warning">The buffer filters read the request/response into 65 RAM and then repack the request/response into the fewest memory 66 buckets possible, at the cost of CPU time. When the request/response 67 is already efficiently packed, buffering the request/response could 68 cause the request/response to be slower than not using a buffer at 69 all. These filters should be used with care, and only where 70 necessary.</div> 71 72</div> 73<div id="quickview"><h3 class="directives">Directives</h3> 74<ul id="toc"> 75<li><img alt="" src="/images/down.gif" /> <a href="#buffersize">BufferSize</a></li> 76</ul> 77<h3>See also</h3> 78<ul class="seealso"> 79<li><a href="/filter.html">Filters</a></li> 80</ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div> 81 82<div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div> 83<div class="directive-section"><h2><a name="BufferSize" id="BufferSize">BufferSize</a> <a name="buffersize" id="buffersize">Directive</a></h2> 84<table class="directive"> 85<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maximum size in bytes to buffer by the buffer filter</td></tr> 86<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>BufferSize integer</code></td></tr> 87<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>BufferSize 131072</code></td></tr> 88<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr> 89<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr> 90<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_buffer</td></tr> 91</table> 92 <p>The <code class="directive"><a href="#buffersize">BufferSize</a></code> 93 directive specifies the amount of data in bytes that will be 94 buffered before being read from or written to each request. 95 The default is 128 kilobytes.</p> 96 97</div> 98</div> 99<div class="bottomlang"> 100<p><span>Available Languages: </span><a href="/en/mod/mod_buffer.html" title="English"> en </a> | 101<a href="/fr/mod/mod_buffer.html" hreflang="fr" rel="alternate" title="Fran�ais"> fr </a></p> 102</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. 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