I recently upgrade from version 3 to 4, please note there are several changes on the VCL. Read carefully the upgrade docs: https://www.varnish-cache.org/docs/t

I recently upgrade from version 3 to 4, please note there are several changes on the VCL. Read carefully the upgrade docs: https://www.varnish-cache.org/docs/trunk/whats-new/upgrading.html https://www.varnish-cache.org/docs/trunk/whats-new/upgrading... Also, despite it's not on the manual, it's worth noting that req.grace and beresp.grace were deprecated.