downloadFile method
Downloads a file from urlName and returns its raw bytes.
Implementation
Future<Uint8List> downloadFile(
{required String urlName, Map<String, dynamic>? data}) async {
final url = Uri.parse(urls.getUrl(urlName));
ensureHeaders({'Content-Type': 'application/json', 'responseType': 'blob'});
final request = await http.post(
url,
body: jsonEncode(data),
headers: _headers,
);
return request.bodyBytes;
}