Personally I'd prefer a promise based api. eg. stub.QueryBooks(qbr).then(...) A benefit of grpc coming to the web means someone will inevitably build a tool to

Personally I'd prefer a promise based api. eg. stub.QueryBooks(qbr).then(...) A benefit of grpc coming to the web means someone will inevitably build a tool to parse a .proto file and generate a ui to test your microservices during dev. That will be cool.