docs: public DeleteItemResponse deleteItem(DeleteItemRequest request)
              throws BceClientException, BceServiceException {
          checkNotNull(request, "request should not be null.");
          InternalRequest httpRequest = createRequestUnderInstance(HttpMethodName.DELETE, 
                  MolaDbConstants.URI_TABLE,
                  request.getTableName(),
                  MolaDbConstants.URI_ITEM);
          this.putKeyInUrl(httpRequest, request.getKey());
          DeleteItemResponse ret = this.invokeHttpClient(httpRequest, DeleteItemResponse.class);
          return ret;
      }