301 Постоянное перенаправление на https, но http работает нормально

Я думаю, вы должны добавить некоторую логику, чтобы заставить ее работать, может быть, это может помочь:

Например, у меня есть экран заставки (Launcher и MAIN) APP:

public class SplashScreen extends AppCompatActivity {
    private final int TIME_OUT = 2000;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_splash_screen);

        // Suscribirse al tema Notificaciones
        FirebaseMessaging.getInstance().subscribeToTopic("NOTA");
        if (getIntent().getExtras() != null) {
            if (getIntent().getExtras().size()>1){
                Intent home_activity = new Intent(getApplicationContext(), Home.class);
                home_activity.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                if (getIntent().getExtras() != null) {
                    for (String key : getIntent().getExtras().keySet()) {
                        String value = "" + getIntent().getExtras().getString(key);
                        Log.d("TAG", key + "=" + value);
                        switch (key) {
                            case "url":
                                home_activity.putExtra("url", value);
                                break;
                        }
                    }
                }
                startActivity(home_activity);
                finish();

            }else{
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        try {
                            Intent home_activity = new Intent(getApplicationContext(), Home.class);
                            home_activity.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                            startActivity(home_activity);
                            finish();
                        } catch (Exception ex) {
                            ex.printStackTrace();
                        }
                    }
                }, TIME_OUT);
            }


        } else {
            new Handler().postDelayed(new Runnable() {
                @Override
                public void run() {
                    try {
                        Intent home_activity = new Intent(getApplicationContext(), Home.class);
                        home_activity.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                        startActivity(home_activity);
                        finish();
                    } catch (Exception ex) {
                        ex.printStackTrace();
                    }
                }
            }, TIME_OUT);
        }

    }

}

И в моем FirebaseService я сделал следующее:

public class FCMessagingService extends FirebaseMessagingService {

    private final String TAG = "PUSH";
    private String body = "";
    private static String _url = "";
    private static int numMessage = 0;

    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        super.onMessageReceived(remoteMessage);

        String from = remoteMessage.getFrom();
        Log.d(TAG, "Mensaje recibido de: " + from);

        if (remoteMessage.getNotification() != null) {
            Log.d(TAG, "Notificación: " + remoteMessage.getNotification().getBody());

            if (remoteMessage.getData().size() > 0) {
                Log.d(TAG, "Data: " + remoteMessage.getData());
                try {
                    JSONObject data = new JSONObject(remoteMessage.getData());
                    String url = data.getString("url");
                    Log.d(TAG, "onMessageReceived: \n" + "Extra Information: " + url);
                    this._url = url;
                    Log.d("_URL",_url);
                    mostrarNotificacion(remoteMessage.getNotification().getTitle(), remoteMessage.getNotification().getBody());
                    mensaje(url, remoteMessage.getNotification().getTitle(), remoteMessage.getNotification().getBody());
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }
        }



    }


    private void mensaje(String url, String title, String body){
        boolean acti =  Util.comprobarActivityALaVista(getApplicationContext(), "com.dev.android.subagan.MainActivity");
        if(acti){

            Intent imain = new Intent(MainActivity.URL);

            imain.putExtra("key_url",url);
            imain.putExtra("key_title",title);
            imain.putExtra("key_body",body);

            LocalBroadcastManager.getInstance(getApplicationContext()).sendBroadcast(imain);

        }else{

            Intent ihome = new Intent(Home.URL);

            ihome.putExtra("key_url",url);
            ihome.putExtra("key_title",title);
            ihome.putExtra("key_body",body);
            LocalBroadcastManager.getInstance(getApplicationContext()).sendBroadcast(ihome);

        }

    }




    private void mostrarNotificacion(String title, String body) {

        final int NOTIFICATION_ID = 3000;

        Intent intent = new Intent(this, MainActivity.class);
        intent.putExtra("url",_url);
        intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);


        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent,PendingIntent.FLAG_UPDATE_CURRENT | PendingIntent.FLAG_ONE_SHOT  );



        Uri soundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);

        NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
                .setSmallIcon(R.mipmap.ic_launcher)
                .setContentTitle(title)
                .setContentText(body)
                .setAutoCancel(true)
                .setSound(soundUri)
                .setTicker(body)
                .setContentIntent(pendingIntent);

        NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        notificationManager.notify(0, notificationBuilder.build());

    }

}