code: def create_discovery_service_request(url, entity_id, **kwargs):
          
  
          args = {"entityID": entity_id}
          for key in ["policy", "returnIDParam"]:
              try:
                  args[key] = kwargs[key]
              except KeyError:
                  pass
  
          try:
              args["return"] = kwargs["return_url"]
          except KeyError:
              try:
                  args["return"] = kwargs["return"]
              except KeyError:
                  pass
  
          if "isPassive" in kwargs:
              if kwargs["isPassive"]:
                  args["isPassive"] = "true"
              else:
                  args["isPassive"] = "false"
  
          params = urlencode(args)
          return "%s?%s" % (url, params)
docs: Created the HTTP redirect URL needed to send the user to the
          discovery service.
  
          :param url: The URL of the discovery service
          :param entity_id: The unique identifier of the service provider
          :param return: The discovery service MUST redirect the user agent
              to this location in response to this request
          :param policy: A parameter name used to indicate the desired behavior
              controlling the processing of the discovery service
          :param returnIDParam: A parameter name used to return the unique
              identifier of the selected identity provider to the original
              requester.
          :param isPassive: A boolean value True/False that controls
              whether the discovery service is allowed to visibly interact with
              the user agent.
          :return: A URL