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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="Français"> 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#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><p><code> |
| AddOutputFilterByType INCLUDES;BUFFER text/html<br /> |
| </code></p></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"><h3 class="directives">Directives</h3> |
| <ul id="toc"> |
| <li><img alt="" src="../images/down.gif" /> <a href="#buffersize">BufferSize</a></li> |
| </ul> |
| <h3>See also</h3> |
| <ul class="seealso"> |
| <li><a href="../filter.html">Filters</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"> en </a> | |
| <a href="../fr/mod/mod_buffer.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p> |
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