code: public static String unresolvedHostAndPortToNormalizedString(String host, int port) {
  		Preconditions.checkArgument(port >= 0 && port < 65536,
  			"Port is not within the valid range,");
  		return unresolvedHostToNormalizedString(host) + ":" + port;
  	}
docs: Returns a valid address for Akka. It returns a String of format 'host:port'.
  When an IPv6 address is specified, it normalizes the IPv6 address to avoid
  complications with the exact URL match policy of Akka.
  @param host The hostname, IPv4 or IPv6 address
  @param port The port
  @return host:port where host will be normalized if it is an IPv6 address