Flutter Test FCM

testfcm.dart

void send() async {
    await http.post(
      Uri.parse('https://fcm.googleapis.com/fcm/send'),
      headers: <String, String>{
        'Content-Type': 'application/json',
        'Authorization': 'key=$serverToken',
      },
      body: jsonEncode(
        <String, dynamic>{
          'notification': <String, dynamic>{
            'body': 'this is a body',
            'title': 'this is a title'
          },
          'priority': 'high',
          'data': <String, dynamic>{
            'id': '1',
            'status': 'done',
          },
          'to': await FirebaseMessaging.instance.getToken(),
        },
      ),
    );
  }