I agree. In my opinion, it would be useful if every browser and API client did something special with that domain. To the best of my knowledge, this is not th

I agree. In my opinion, it would be useful if every browser and API client did something special with that domain. To the best of my knowledge, this is not the case. AFAIK I could easily plug that domain into my unbound servers which my SSL MITM proxy utilize and route traffic to it. If the client is not aware of a special domain, then you are dependent on the infrastructure to behave in a predictable manor. Attackers can alter that behavior.