Actions after cache miss is detected (no replies)

Hello,

Is there a way to perform an action after a cache miss is detected but before the request is forwarded to the upstream server?

Specifically, on a cache miss I want to:
Return a response instead of forwarding the request to the upstream server.
Trigger a handler (module or script) that executes asynchronously to the request.

The latter I could do by looking at the logs. But I was wondering if there is a more elegant way.

Thanks…

Roger



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