Http3/Quic - will need to have a way to specify which requests can be done with 0RTT

Due to ability to replay 0RTT resumption, only actions that don't update state should be allowed as 0RTT, or you could get it replayed multiple times. If the proxy is terminating the requests, it will need to know whether the requests are suitable for 0RTT - it can filter out non GET requests, but likely needs additional rules on the GET requests.