On Tue, Sep 21, 2021 at 1:33 PM Luca Gervasi <[email protected]> wrote: > > Hello everyone, > > We have a backend that actually proxies different services (mangling > the original response). Sometimes one of those backends are not > available and the general response goes from 200 to a 50x. > Is there a way to serve a stale (valid) content (if present) for a > request that comes from a backend in a healthy state? > > I was thinking about something like this: > sub backend_fetch { > if (beresp.status >= 500) { > return_a_stale; > } > } > > From the state machine > (https://varnish-cache.org/docs/6.0/reference/states.html) it seems > that I'm not allowed to return(hash) nor switch to an unhealthy > backend (that i keep configured) to reach what I want. > > Please forgive me if do exists a facility to reach my goal and feel > free to direct me to the right document. > > Ah. Varnish 6.x.
Hi Luca, Varnish Cache does not have this feature, you should be able to do that with Varnish Enterprise instead. What you are looking for is stale-if-error and you may find some implementations using VCL but I can't vouch for any, not having experience with them. https://docs.varnish-software.com/varnish-cache-plus/vmods/stale/#description Cheers, Dridi _______________________________________________ varnish-misc mailing list [email protected] https://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc
