RESTful services

RESTful services are a key technology for making computer systems talk to each other and, more specifically, making application frontends talk to their backends, and sometimes to other third-party integrations. They are functions that are deployed on a server and can be called remotely from any other system. RESTful is not just another protocol for remoting with HTTP; it's a full architectural style used to build your enterprise applications and make them extensible by other modules or separate systems.

In Chapter 5,  Exposing Web Services with JAX-RS 2.1, we will learn what RESTful services are and how to create your own RESTful services using JAX-RS. Moreover, we'll learn how to use Postman to test your RESTful services. JAX-RS topics such as accepting and processing user parameters, producing JSON responses, and uploading files are all covered in this chapter. In the final section, we'll learn about the newly introduced support for server-sent events in JAX-RS and look at examples of how to use it to provide your clients with on-demand real-time notifications about different business events.