Hi developers of Varnish I read information about Varnish 4 release ( https://varnish-cache.org/li sts/pipermail/varnish-announce/2014-April/000696.html ) and found there a new feature http://prntscr.com/k8dgfk . I need an information about refreshing expired cache in background.
As I know from developer guide, fetching new object in background thread is available only in Grace Mode - http://book.varnish- software.com/4.0/chapters/Saving_a_Request.html#grace-mode when object's ttl has expired but grace period is not over yet. Here are my questions: 1. When and how can I use background cache refreshing? 2. Why Grace Mode and cache invalidation via "ban" command doesn't work together? Thanks
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