Spring REST Core Knowledge Controller Basics ResponseEntity Patterns --- Global Exception Handling --- Validation --- HATEOAS RepresentationModelAssembler --- Content Negotiation --- API Versioning URL Versioning Header Versioning Media Type Versioning --- Async Controllers --- Streaming Response --- Production Readiness Request/Response Logging Checklist - [ ] ResponseEntity for all responses - [ ] Global exception handler - [ ] Input validation with @Valid - [ ] Proper HTTP status codes - [ ] Location header for 201 Created - [ ] HATEOAS links where appropriate - [ ] Content negotiation con…