per_call in vmod

[AD]

hello,

 How does per_call know what to cache on in the vmod?  Is it based on the
parameters to the function or based on the request in the VCL?  I have run
some tests previously where i make multiple http requests with different
URLs and priv_call returns the same cached response.

 Looking at this page
https://www.varnish-cache.org/trac/wiki/ArchitectureVmodStorage it seems if
i call a function in a vmod with priv_call with different parameters i
should be able to cache them independently.  How is this supposed to work?
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