gRPC support

Hello!

Does CloudFlare support gRPC? I was trying to use gRPC behind CloudFlare but it always returned errors like this:

Error: rpc error: code = Unavailable desc = all SubConns are in TransientFailure, latest connection error: connection closed

I switched to Python client and found this error:

{..."grpc_message":"Trying to connect an http1.x server","grpc_status":14}"

Could we force http 2 for gRPC requests?

gRPC is supported by Spectrum.

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