Quarkus Cookbook

Chapter 13. Quarkus REST Clients

In Chapter 3, you learned about developing RESTful services, but in this chapter, you’ll learn about communication between RESTful web services.

Using any service-based architecture inevitably means that you need to communicate with external services. These services might be internal services (you control the life cycle of the service and they are usually deployed in the same cluster) or external services (third-party services).

If these services are implemented as RESTful web services, then you need a client to interact with these services. Quarkus offers two ways to do that: JAX-RS Web Client, which is the standard Java EE way of communicating with RESTful service; and MicroProfile REST Client, which is the new way of communicating with RESTful services.

This chapter will include recipes for the following:

• Communicate to other RESTful services using the JAX-RS client

• Communicate to other RESTful services using the MicroProfile Rest Client

• Secure the communication between RESTful services

13.1 Using the JAX-RS Web Client

Problem

You want to communicate with another RESTful web service.

Solution

Use JAX-RS web client to communicate with other RESTful web services.

Let’s look at how to communicate with other RESTful services using the JAX-RS spec.

The external service we are going to connect with, the World Clock API, returns the current date/time by time zone. You’ll need to get the current date/time exposed by the API.

You need to ...