URL url = new URL("ТУТСАЙТ.com");
                HttpsURLConnection urlConnection = (HttpsURLConnection)url.openConnection();
                urlConnection.setRequestProperty("Content_type", "application/json");
                urlConnection.setRequestMethod("POST");
                urlConnection.setDoInput(true);
                urlConnection.setDoOutput(true);
                urlConnection.connect();
                JSONObject jsonObject = new JSONObject();
                jsonObject.put("username", s1);
                jsonObject.put("password", s2);