Can I use checkFunction to check for a REFUSED response?

[Gunni]

For example if i use an adblocking upstream, it always responds REFUSED for blocked domains. But if my quota runs out it stops doing so and returns successful responses.

Can i make a healthcheck function that expects REFUSED and fails on successful response?

If no, is there another way i could get the same result?

[rgacogne]

No, I'm afraid not. In hindsight checkFunction was badly named as it can only be used to generate the qname, qtype and qclass of the health-check query. It does not handle the response. I guess we could introduce a new callback to do that, so please feel free to open a feature request!