TTL <=0 ?

[Guillaume Quintard]

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 <geoff at uplex.de> 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
> --
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