gRPC trong Go dùng khi nào?

RPC framework dùng Protocol Buffers (protobuf).

• Nhanh hơn REST (binary encoding, HTTP/2).
• Dùng khi: microservices internal communication, streaming (bidirectional), cần type safety chặt.
• Define service trong .proto file → protoc generate Go code.
• Hỗ trợ: unary, server streaming, client streaming, bidirectional.