I have been asked if it is possible to somehow retain cookies so that they
are available to the Drupal PHP code, but not have them used for caching
within Varnish.
I could not think of a way to perform this, but thought I would ask those
with more experience.
Does anyone know if this is possible?
In general yes it should be possible.
You can look for example at this article
https://www.fastly.com/blog/vcl-cookie-monster (it's for the 3.x varnish but
you should get the idea).
For recent 4.x varnish the filtering should be even more simple with the
Cookie vmod
https://github.com/varnish/varnish-modules/blob/master/docs/vmod_cookie.rst
and maybe the variable mod to store the initial cookies (rather than the old
way in extra headers).
rr
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