One minor addition to Geoff's excellent answer: you may want to try this VCL: https://docs.varnish-software.com/tutorials/hit-miss-logging/ Specially at the beginning it helps knowing what happened to the request.
-- Guillaume Quintard On Tue, Sep 27, 2022 at 6:33 AM Geoff Simmons <[email protected]> wrote: > On 9/27/22 15:07, Johan Hendriks wrote: > > Hello all, varnish tells me that the TTL is smaller or equal to 0, but > > looking at the response headers that is not the case as the BerespHeader > > has Expires: Wed, 27 Sep 2023 12:23:11 GMT which is in 2023! > > > > - Begin bereq 8203147 pass > > The request was set to pass on the client side; that sets > bereq.uncacheable=true, which is passed along to the backend side as > beresp.uncacheable=true. > > The Expires response header (and also Cache-Control in your example) > might at least tell browser caches that they can cache the response. But > Varnish won't cache it. > > [...] > > - BereqHeader Cookie: _sharedid=redacted; cto_bundle=redacted > [...] > > > Am i right that the TTL is <=0 because it sends a cookie to the backend? > > If you haven't changed this part of builtin.vcl, then yes: > > sub vcl_req_cookie { > if (req.http.Cookie) { > # Risky to cache by default. > return (pass); > } > } > > If a request/response has a property such as a Cookie header, and a > number of other things that suggest that the response may be > personalized, then it can't take the chance of caching it by default. > That can be one of the worst mistakes you can make with a caching proxy. > > So if you need to be able to cache despite the presence of cookies, as > do many sites these days, you need to write rules for that in VCL. > Default VCL has to make the safest choice. > > > Best, > Geoff > -- > ** * * UPLEX - Nils Goroll Systemoptimierung > > Scheffelstraße 32 > 22301 Hamburg > > Tel +49 40 2880 5731 > Mob +49 176 636 90917 > Fax +49 40 42949753 > > http://uplex.de > _______________________________________________ > varnish-misc mailing list > [email protected] > https://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc >
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