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if (_dio == null) {
      _dio = Dio();

      (dio.httpClientAdapter as DefaultHttpClientAdapter).onHttpClientCreate =
          (client) {
        client.badCertificateCallback =
            (X509Certificate cert, String host, int port) {
          // Here make your own SSL cert validation
          // if you want accept everything, just return true
          return true;
        };
      };
    }