Spring WebFlux is a reactive web framework included with Spring. It supports fully nonblocking and support Reactive Streams backpressure. It runs on servers like Netty, Undertow or Servlet Containers. When such a server is detected Spring Boot will automatically configure the server for you.
4-1. Develop a Reactive Application with Spring WebFlux
Problem
You want to develop a simple reactive web application with Spring WebFlux to learn the basic concepts and configurations of this framework.