Spring Start Here

11 Consuming REST endpoints

This chapter covers

• Calling REST endpoints using Spring Cloud OpenFeign
• Calling REST endpoints using RestTemplate
• Calling REST endpoints using WebClient

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).

Figure 11.1 Often, a backend app needs to act as a client for another backend ...