Dio with HTTP certificates pinning

dio.dart

final certificates = await rootBundle.load('assets/openssl/google.crt');
final dio = Dio();
(dio.httpClientAdapter as IOHttpClientAdapter).onHttpClientCreate = (client) {
  final securityContext = SecurityContext(); //1
  securityContext.setTrustedCertificatesBytes(certificates.buffer.asUint8List());
  return HttpClient(context: securityContext);
};

final response = await dio.getUri(Uri.parse('https://google.pl'));
print(response.statusCode);