fetchFile method
Fetch and download a random file with its metadata (if available).
For more advanced options, you should use the Client.fetch()
method and
fetch the file yourself.
Implementation
Future<NBBufferResponse> fetchFile(String endpoint) async {
final res = (await fetch(endpoint: endpoint))[0];
final bytes = await request(res.url).then((value) => value.bodyBytes);
return NBBufferResponse(bytes, res);
}