Golang gRPC Microservices: Production Guide with Protobuf, TLS & Middleware
Why gRPC for Go Microservices? Answer-first: gRPC is the right choice for Go microservices when you need: binary-efficient serialization (Protobuf is 3–10× smaller than JSON), bidirectional streaming for real-time data, strongly-typed contracts across services, and sub-millisecond inter-service latency. Google, Uber, Netflix, and Square use gRPC as the primary inter-service communication protocol. This guide shows you how to build production-grade Go gRPC services from scratch. The key advantages over REST: gRPC REST/JSON Serialization Protobuf (binary, schema-enforced) JSON (text, schema-optional) Payload size 3–10× smaller Baseline Streaming Unary, Client, Server, Bidirectional HTTP/2 SSE (server-only), WebSocket (separate) Contract .proto file (language-agnostic codegen) OpenAPI (opt-in, often stale) Latency ~0.5ms p50 inter-service ~2–5ms p50 inter-service Browser support gRPC-Web (needs proxy) Native Best for Internal microservices, streaming Public APIs, browser clients Step 1: Define Your Service with Protobuf Create the contract first — Protobuf schema drives code generation for all languages. ...