code: def set_rest_notification(self, url, hit_type_id):
          
          ISO8601 = "%Y-%m-%dT%H:%M:%SZ"
          notification_version = "2006-05-05"
          API_version = "2014-08-15"
          data = {
              "AWSAccessKeyId": self.aws_key,
              "HITTypeId": hit_type_id,
              "Notification.1.Active": "True",
              "Notification.1.Destination": url,
              "Notification.1.EventType.1": "AssignmentAccepted",
              "Notification.1.EventType.2": "AssignmentAbandoned",
              "Notification.1.EventType.3": "AssignmentReturned",
              "Notification.1.EventType.4": "AssignmentSubmitted",
              "Notification.1.EventType.5": "HITReviewable",
              "Notification.1.EventType.6": "HITExpired",
              "Notification.1.Transport": "REST",
              "Notification.1.Version": notification_version,
              "Operation": "SetHITTypeNotification",
              "SignatureVersion": "1",
              "Timestamp": time.strftime(ISO8601, time.gmtime()),
              "Version": API_version,
          }
          query_string, signature = self._calc_old_api_signature(data)
          body = query_string + "&Signature=" + urllib.parse.quote_plus(signature)
          data["Signature"] = signature
          headers = {
              "Content-Type": "application/x-www-form-urlencoded; charset=UTF-8",
              "Content-Length": str(len(body)),
              "Host": self.legacy_host,
          }
          resp = requests.post("https://" + self.legacy_host, headers=headers, data=body)
          return "<IsValid>True</IsValid>" in resp.text
docs: Set a REST endpoint to recieve notifications about the HIT
          The newer AWS MTurk API does not support this feature, which means we
          cannot use boto3 here. Instead, we make the call manually after
          assembling a properly signed request.