I've experimented with req/obj.grace set to a few hours so a site can be served even if the backend fails. For example, with the backend down and when req/obj.grace is set to several hours I can open a new browser and get a 503 if I try to open a known cached (and graced) page. However if I refresh the same browser several times very rapidly I finally receive the graced page. It seems to be working as expected from what I read in the documentation regarding the graced object being served while the same object is being fetched by another thread. The rapid refreshing is generating a second thread request which then satisifies the requirements to have the graced object served. Is there a way to configure varnish to serve the cached graced object if the backend fails without the browser ever seeing the 503? Can this also be tied into the backend probing/polling?
Thanks, --J _______________________________________________ varnish-misc mailing list [email protected] http://projects.linpro.no/mailman/listinfo/varnish-misc
