Another very important support function is an edge server. As we already described in Chapter 1, Introduction to Microservices, in the Edge server section, it can be used to secure a microservice landscape, that is, hide private services from external usage and protect public services when they're used by external clients.
Initially, Spring Cloud used Netflix Zuul v1 as its edge server. Since the Spring Cloud Greenwich release, it's recommended to use Spring Cloud Gateway instead. Spring Cloud Gateway comes with similar support for critical features, such as URL path-based routing and the protection of endpoints via the use of OAuth 2.0 and OpenID Connect (OIDC).
One important difference between Netflix Zuul v1 and Spring Cloud Gateway is that Spring Cloud Gateway is based on non-blocking...
