Graphql

REST, gRPC, GraphQL exchange format decision; HTTP methods; URL modeling; status codes; OAS; versioning; Postel's Robustness Principle; non-breaking vs breaking changes; implementation-as-de-facto-spec; version translation in controllers; API-first

REST vs gRPC vs GraphQL: decision table by traffic type; trade-off analysis across caching, schema, streaming, browser support, evolution; mixing protocols; chatty API anti-pattern