class DownloadOkHttp3Connection implements DownloadConnection, DownloadConnection.Connected {

    @Override public void release() {
        request = null;
        if (response != null) response.close();
        response = null;
    }

      DownloadOkHttp3Connection(@NonNull OkHttpClient client,
                              @NonNull Request.Builder requestBuilder);
      DownloadOkHttp3Connection(@NonNull OkHttpClient client, @NonNull String url);

}