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	This option allows for a limit to be placed on replies before the
	request is placed in a delay pool. It operates on the HTTP request,
	not the HTTP reply.

	It can be used to prevent users from downloading very large files
	at high speed. When the response headers are received, the
	delay_body_max_size lines are processed, and the first matching
	line is used as the maximum body size for this reply before
	it gets assigned to the specified pool

	The size is specified with unit, i.e. 4 MB

	To make exceptions where the request should not be reassigned to
	a delay pool specify the keyword none as bytes value and no
	delay_pool value (one argument less in such case)