short: protobuf based (so relatively language agnostic) rpc mechanisms that communicates over http2 slightly longer: one writes a protobuf that gets compiled i

short: protobuf based (so relatively language agnostic) rpc mechanisms that communicates over http2 slightly longer: one writes a protobuf that gets compiled into a language specific server and client code. All you have to do is implement the server functions or call the generated client functions to make rpc calls.