Authorization with OAuth2

We have already discussed some concepts and solutions related to authentication in a microservices environment. I have shown you the examples of basic and SSL authentication between microservices and a service discovery, and also between microservices and a config server. In inter-service communication, authorization seems to be more important then authentication, which is instead implemented on the edge of the system. It's worth understanding the difference between authentication and authorization. Simply put, authentication verifies who you are, while authorization verifies what you are authorized to do.

Currently the most popular authorization methods for RESTful HTTP APIs are OAuth2 and Java Web Tokens (JWT). They may be mixed together as they are rather more complementary than other solutions. Spring provides support for OAuth providers and consumers. With Spring Boot and Spring Security OAuth2, we may quickly implement common security patterns, such as single...