code: def set_url(self, url: str):
          
          gas_limit = self.proxy.estimate_gas('latest', 'setURL', url)
          transaction_hash = self.proxy.transact('setURL', gas_limit, url)
          self.client.poll(transaction_hash)
          assert not check_transaction_threw(self.client, transaction_hash)
docs: Sets the url needed to access the service via HTTP for the caller