Connecting to on-premise RESTful web services?

Hello all,

I've successfully been able to connect to on-premise services via HTTP by follow the tutorial at https://help.hana.ondemand.com/help/frameset.htm?e76f9e75bb571014a7218bcd30a8771b.html, but since a Destination must contain the full and exact URL, there doesn't seem to be any way to pass parameters to a RESTful web service using this method. Is there any alternative that allows for the dynamic construction of URLs?

Thanks,

Johnny