Codec returns a proxying grpc.Codec with the default protobuf codec as parent.

CodecWithParent returns a proxying grpc.Codec with a user provided codec as parent.

RegisterService sets up a proxy handler for a particular gRPC service and method.

TransparentHandler returns a handler that attempts to proxy all requests that are not registered in the server.

StreamDirector returns a gRPC ClientConn to be used to forward the call to.