Using Feign client

RestTemplate is a Spring component specially adapted to interact with Spring Cloud and microservices. However, Netflix has developed their own tool that acts as a web service client for providing out-of-the-box communication between independent REST services. Feign client, which is in it, generally does the same as RestTemplate with the @LoadBalanced annotation, but in a more elegant way. It is a Java to HTTP client binder that works by processing annotations into a templatized request. When using Open Feign client, you only have to create an interface and annotate it. It integrates with Ribbon and Eureka to provide a load balanced HTTP client, fetching all the necessary network addresses from service discovery. Spring Cloud adds support for Spring MVC annotations and for using the same HTTP message converters as in Spring Web.

Support for different zones

Let me back up for a moment to the last example. I'm going to propose some changes to complicate our system architecture...