docs: def update(self):
          '''
          Check and update the object with conditional request
          :rtype: Boolean value indicating whether the object is changed
          '''
          conditionalRequestHeader = dict()
          if self.etag is not None:
              conditionalRequestHeader[Consts.REQ_IF_NONE_MATCH] = self.etag
          if self.last_modified is not None:
              conditionalRequestHeader[Consts.REQ_IF_MODIFIED_SINCE] = self.last_modified
  
          status, responseHeaders, output = self._requester.requestJson(
              "GET",
              self._url.value,
              headers=conditionalRequestHeader
          )
          if status == 304:
              return False
          else:
              headers, data = self._requester._Requester__check(status, responseHeaders, output)
              self._storeAndUseAttributes(headers, data)
              self.__completed = True
              return True