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<div class="moz-cite-prefix">On 27/09/2022 18:00, Guillaume Quintard
wrote:<br>
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cite="mid:CAOrPork8exCQQDbnCJbf4DCWnhuS4MmzQZcpMYFz6cvCAzc0Og@mail.gmail.com">
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<div dir="ltr">One minor addition to Geoff's excellent answer: you
may want to try this VCL: <a
href="https://docs.varnish-software.com/tutorials/hit-miss-logging/"
moz-do-not-send="true" class="moz-txt-link-freetext">https://docs.varnish-software.com/tutorials/hit-miss-logging/</a>
<div>Specially at the beginning it helps knowing what happened
to the request.</div>
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<div dir="ltr" class="gmail_signature"
data-smartmail="gmail_signature">
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<div>-- <br>
</div>
<div>Guillaume Quintard<br>
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<div dir="ltr" class="gmail_attr">On Tue, Sep 27, 2022 at 6:33
AM Geoff Simmons <<a href="mailto:geoff@uplex.de"
moz-do-not-send="true" class="moz-txt-link-freetext">geoff@uplex.de</a>>
wrote:<br>
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<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On
9/27/22 15:07, Johan Hendriks wrote:<br>
> Hello all, varnish tells me that the TTL is smaller or
equal to 0, but <br>
> looking at the response headers that is not the case as
the BerespHeader <br>
> has Expires: Wed, 27 Sep 2023 12:23:11 GMT which is in
2023!<br>
> <br>
> - Begin bereq 8203147 pass<br>
<br>
The request was set to pass on the client side; that sets <br>
bereq.uncacheable=true, which is passed along to the backend
side as <br>
beresp.uncacheable=true.<br>
<br>
The Expires response header (and also Cache-Control in your
example) <br>
might at least tell browser caches that they can cache the
response. But <br>
Varnish won't cache it.<br>
<br>
[...]<br>
> - BereqHeader Cookie: _sharedid=redacted;
cto_bundle=redacted<br>
[...]<br>
<br>
> Am i right that the TTL is <=0 because it sends a
cookie to the backend?<br>
<br>
If you haven't changed this part of builtin.vcl, then yes:<br>
<br>
sub vcl_req_cookie {<br>
if (req.http.Cookie) {<br>
# Risky to cache by default.<br>
return (pass);<br>
}<br>
}<br>
<br>
If a request/response has a property such as a Cookie header,
and a <br>
number of other things that suggest that the response may be <br>
personalized, then it can't take the chance of caching it by
default. <br>
That can be one of the worst mistakes you can make with a
caching proxy.<br>
<br>
So if you need to be able to cache despite the presence of
cookies, as <br>
do many sites these days, you need to write rules for that in
VCL. <br>
Default VCL has to make the safest choice.<br>
<br>
<br>
Best,<br>
Geoff<br>
-- <br>
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<p>Thank you all, that explains a lot. <br>
regards<br>
Johan<br>
</p>
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