Why Your Microservices Should Talk Like Functions, Not URLs (A Practical gRPC Walkthrough in Go)

In most microservice setups, service-to-service communication starts the same way: GET /api/v1/users/{id} It works. It’s familiar. It’s easy to debug. But it forces service-to-service calls into a URL-driven model. Internal services aren’t browsers. They don’t benefit from clean URLs or REST-style resource modeling. They don’t need JSON payloads designed around human readability. And they don’t need APIs designed around manual testing workflows. What they need is a strict contract and a predicta