# File lib/pry-remote-em/broker.rb, line 146
    def receive_unregister_server(url)
      url      = URI.parse(url)
      url.host = peer_ip if ['0.0.0.0', 'localhost', '127.0.0.1'].include?(url.host)
      log.warn("[pry-remote-em broker] unregister #{url}")
      Broker.servers.delete(url)
    end