So I think your issue is OpenURLDb is for the Notes client as it uses the Notes Web Navigator (very old tech) to fetch the web details, not sure that will do anything on the domin server
You would be better off using Java if you are going to do this on the server anyway. I'd search google for:
domino java agent http request
Also as this obviously an internal IBM piece of code, perhaps you can get help within the IBM forums on W3?