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This is a simple solution to having the proxy keep up to date with the state of the cluster. Basically, it uses the cluster configuration provided at start up (i.e. with `-initial-cluster-state`) to determine where to reach peer(s) in the cluster, and then it will periodically hit the `/members` endpoint of those peer(s) (using the same mechanism that `-cluster-state=existing` does to initialise) to update the set of valid client URLs to proxy to. This does not address discovery (#1376), and it would probably be better to update the set of proxyURLs dynamically whenever we fetch the new state of the cluster; but it needs a bit more thinking to have this done in a clean way with the proxy interface. Example in Procfile works again.