code: def get_api_url(self, lambda_name, stage_name):
          
          api_id = self.get_api_id(lambda_name)
          if api_id:
              return "https://{}.execute-api.{}.amazonaws.com/{}".format(api_id, self.boto_session.region_name, stage_name)
          else:
              return None
docs: Given a lambda_name and stage_name, return a valid API URL.