Https证书失效报错

main.dart

class MyHttpOverrides extends HttpOverrides {
@override
HttpClient createHttpClient(SecurityContext context) {
return super.createHttpClient(context)
..badCertificateCallback =
(X509Certificate cert, String host, int port) => true; }}

void main() async {
WidgetsFlutterBinding.ensureInitialized();
HttpOverrides.global = new MyHttpOverrides();
runApp(Myapp());}