code: def _ensure_request_id_header(self):
          "Ensure request headers have a request ID. Set one if needed."
          if REQUEST_ID_HEADER not in self.request.headers:
              self.request.headers.add(REQUEST_ID_HEADER, uuid.uuid1().hexf _ensure_request_id_header(self):
          "Ensure request headers have a request ID. Set one if needed."
          if REQUEST_ID_HEADER not in self.request.headers:
              self.request.headers.add(REQUEST_ID_HEADER, uuid.uuid1().hex)
docs: Ensure request headers have a request ID. Set one if needed.