in the website and on my client, when I try to get the cities I get an error. in your website it says: "It was not possible to load the output: Something wrong happened in our side. Please try again later." all the time at the end and on the client I just get an error like that: {"error":"unauthorized"}

Could you please share the query that you are trying to execute?

this is the code the website generated for me: (I'm trying to get the cities from the database)

(new Thread(new Runnable() { @Override public void run() { try { URL url = new URL("https://parseapi.back4app.com/classes/Continentscountriescities_City/CityList?keys=name"); HttpURLConnection urlConnection = (HttpURLConnection)url.openConnection(); urlConnection.setRequestProperty("X-Parse-Application-Id", "0saXVLkePf7VXrftKvcAwqeffeNbxHUAA1eBbOh7"); // This is your app's application id urlConnection.setRequestProperty("X-Parse-REST-API-Key", "RHresVbGu9orrnXhwhTqjPmRCWfIVKGiOP8i5jIi"); // This is your app's REST API key try { BufferedReader reader = new BufferedReader(new InputStreamReader(urlConnection.getInputStream())); StringBuilder stringBuilder = new StringBuilder(); String line; while ((line = reader.readLine()) != null) { stringBuilder.append(line); } JSONObject data = new JSONObject(stringBuilder.toString()); // Here you have the data that you need Log.d("MainActivity", data.toString(2)); } finally { urlConnection.disconnect(); } } catch (Exception e) { Log.e("MainActivity", e.toString()); } } })).start();

Where you see https://parseapi.back4app.com/classes/Continentscountriescities_City/CityList?keys=name could you please try to change to https://parseapi.back4app.com/classes/Continentscountriescities_City?keys=name? It is strange it is generating for you with CityList at the end. Could you please double check and confirm?

Also... I recommend you to generate a new rest key for your app (you can do that under Dashboard -> Server Settings -> Core Settings) since you made it public.