Varnish backend timeout doesn't work with keep alive backend

[JackDrogon]

Hi,All:
	I set varnish backend that:
	backend default { .host = "127.0.0.1"; .port = "4567"; .connect_timeout = 1s; .first_byte_timeout = 2s; .between_bytes_timeout = 1s; }
	The first timeout is right, but if the prev connection is right, varnish use keepalive to deal with the next connection with same url and the timeout conf doesn't wok.
	How can make timeout work with all connections even with backend keepalive.

Thanks.
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