Spring WebFlux Full Reference : See advanced.md for SSE with Sinks, Testing with StepVerifier, and Context Propagation patterns. Quick Start --- Mono & Flux Basics Mono (0 or 1 element) Flux (0 to N elements) --- Reactive Operators Transformation Filtering Combining Error Handling Side Effects --- WebClient Configuration Usage --- Functional Endpoints --- Best Practices | Do | Don't | |----|-------| | Keep chain fully reactive | Use .block() in handlers | | Use appropriate operators (flatMap vs concatMap) | Mix blocking and reactive | | Handle errors with onError operators | Ignore errors | |…