docs: public DownloadResult downloadFile(String mediaId)
              throws APIConnectionException, APIRequestException {
          Preconditions.checkArgument(null != mediaId, "mediaId is necessary");
  
          ResponseWrapper response = _httpClient.sendGet(_baseUrl + resourcePath + "?mediaId=" + mediaId);
          return DownloadResult.fromResponse(response, DownloadResult.class);
      }