Reactive Stack: Introduction to Spring WebFlux

Spring WebFlux is the reactive alternative to Spring MVC. It uses a small, fixed thread pool and non-blocking I/O to handle thousands of concurrent connections — ideal for high-concurrency, low-latency services like gateways, streaming endpoints, and services that do many I/O-bound calls. The programming model is built around Reactor's Mono (0-1 item) and Flux (0-N items).

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