checkForCharlesProxy.dart

  void checkForCharlesProxy(Dio dio) {
    const charlesIp =
    String.fromEnvironment('CHARLES_PROXY_IP', defaultValue: null);
    if (charlesIp == null) return;
    debugPrint('#CharlesProxyEnabled');
    (dio.httpClientAdapter as DefaultHttpClientAdapter).onHttpClientCreate =
        (client) {
      client.findProxy = (uri) => "PROXY $charlesIp:8888;";
      client.badCertificateCallback =
          (X509Certificate cert, String host, int port) => true;
    };
  }