Ing sistem, komponen (layanan, klien) komunikasi melalui APIs lan berbagai protokol — sinkron (REST, gRPC) lan asinkron (messaging/queues). Pemahaman tentang cara komponen berkomunikasi adalah fundamental untuk merancang sistem yang terdiri dari banyak bagian.
Komunikasi sinkron (request/response)
The caller WAITS for a response (blocking):
REST (HTTP) → most common; resources over HTTP (JSON) → simple, ubiquitous, web-friendly
gRPC → high-performance RPC (binary, HTTP/2) → fast, typed; good for internal services
GraphQL → flexible queries (client requests exactly what it needs)
→ for: direct request/response where the caller needs an answer now
