Apache Module mod_buffer

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Description:	Support for request buffering
Status:	Extension
Module Identifier:	buffer_module
Source File:	mod_buffer.c
Compatibility:	Available in Apache 2.3 and later

Summary

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This module provides the ability to buffer the input and output + filter stacks.

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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.

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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.

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The buffer filter may be added to either the input or the + output filter stacks, as appropriate, using the + SetInputFilter, + SetOutputFilter, + AddOutputFilter or + AddOutputFilterByType directives.

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Using buffer with mod_include

AddOutputFilterByType INCLUDES;BUFFER text/html

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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.

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Directives

BufferSize

Bugfix checklist

BufferSize Directive

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Description:	Maximum size in bytes to buffer by the buffer filter
Syntax:	`BufferSize integer`
Default:	`BufferSize 131072`
Context:	server config, virtual host, directory, .htaccess
Status:	Extension
Module:	mod_buffer

The BufferSize + 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.

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