In chapter 10, we discussed implementing REST endpoints. REST services are a common way to implement the communication between two system components. The client of a web app can call the backend, and so can another backend component. In a backend solution composed of multiple services (see appendix A), these components need to “speak” to exchange data, so when you implement such a service using Spring, you need to know how to call a REST endpoint exposed by another service (figure 11.1).
