Http not working in old android phones (Flutter)

I added http package to my FLUTTER project and it works fine on the emulator but on old phones it’s not working .

How to make it work on old phone ?

>Solution :

Usually on dart you should have a .pem file that contains the encryption in your assets folder then you can add it like that in your main.dart file like that :

void main() async{
  WidgetsFlutterBinding.ensureInitialized();
  SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp]);
  ByteData data = await PlatformAssetBundle().load('assets/yourkey.pem');
  SecurityContext.defaultContext.setTrustedCertificatesBytes(data.buffer.asUint8List());
  runApp(const MyApp());
}