How to use varnish to pass data when the backend is ok && return the last normal beresq when the backend is down?

JackDrogon jack.xsuperman at
Mon Nov 7 06:20:12 CET 2016

Hi, All:
	I need varnish to return data directly and update cache at every time when the backend is ok. I also need varnish to return the last normal beresq data from the cache when the backend is down. How shuold I do with varnish?

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