docs: public Response upload() throws QiniuException {
          buildParams();
          if (data != null) {
              return client.multipartPost(configuration.upHost(token), params, "file", fileName, data,
                      mime, new StringMap());
          }
          return client.multipartPost(configuration.upHost(token), params, "file", fileName, file,
                  mime, new StringMap());
      }