title: How to pass a proto binary directly in a gRPC call?
body: <p>I already have the proto binary of a protobuf message object. </p>
  
  <p>Right now to make a gRPC call I need to unmarshal it and send over the message object to the gRPC client(which will marshal the same object again), in the process wasting latency. </p>
  
  <p>How can I avoid this by passing the binary to the client?</p>