是否有可能告诉哪个应用程序实例在Cloud Foundry上提供请求？

As you know, an application on Cloud Foundry could have more than 1 instances. Sometime, all or some of them need be configured through the HTTP Request, like altering the logger level. But due to the load balance, round-robin, one user's multiple requests may be routed to different instances. So, for the user, I didn't find a way to specify which instance to be configured, or tell which instance has already been configured. As you know, an application on Cloud Foundry co