downloadFile method
Download the File.
Throws a http.ClientException if there were problems communicating with
the API service. Throws a StatusException if the API failed with a
Status message. Throws a ServiceException for any other failure.
Implementation
Future<DownloadFileResponse> downloadFile(DownloadFileRequest request) async {
final url = Uri.https(_host, '/v1beta/${request.name}:download');
final response = await _client.get(url);
return DownloadFileResponse.fromJson(response);
}