@GetMapping({ "/apps/{appName}/{id}", "/instances/{id}" })
	public InstanceInfo getInstance(@PathVariable(required = false) String appName, @PathVariable String id) {
		return INFO;
	}
Simulates Eureka Server own's serialization.
@return converter
spring-cloud-netflix-eureka-client/src/test/java/org/springframework/cloud/netflix/eureka/http/EurekaServerMockApplication.java