@@ -89,6 +89,47 @@ normal Eureka functionality under `/v2/*`.
Eureka background reading: see https://github.com/cfregly/fluxcapacitor/wiki/NetflixOSS-FAQ#eureka-service-discovery-load-balancer[flux capacitor] and https://groups.google.com/forum/?fromgroups#!topic/eureka_netflix/g3p2r7gHnN0[google group discussion].
[TIP]
====
You can run the Eureka server as an executable JAR (or WAR) using the
Netflix has created a library called https://github.com/Netflix/Hystrix[Hystrix] that implements the http://martinfowler.com/bliki/CircuitBreaker.html[circuit breaker pattern]. In a microservice architecture it is common to have multiple layers of service calls.
Zuul's rule engine allows rules and filters to be written in essentially any JVM language, with built in support for Java and Groovy.
[[netflix-zuul-reverse-proxy]]
=== Embedded Zuul Reverse Proxy
Spring Cloud has created an embedded Zuul proxy to ease the development of a very common use case where a UI application wants to proxy calls to one or more back end services. To enable it, annotate a Spring Boot main class with `@EnableZuulProxy`. This forwards local calls to `/proxy/*` to the appropriate service. The proxy uses Ribbon to locate an instance to forward to via Eureka. Forwarding to the service is protected by a Hystrix circuit breaker. Rules are configured via the Spring environment. The Config Server is an ideal place for the Zuul configuration. Configuration rules look like the following: