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public static void pushNotificationToMobile(List<String> mobileIdList) {
        try {
            String jsonResponse;

            URL url = new URL("https://onesignal.com/api/v1/notifications");
            HttpURLConnection con = (HttpURLConnection) url.openConnection();
            con.setUseCaches(false);
            con.setDoOutput(true);
            con.setDoInput(true);

            con.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
            con.setRequestMethod("POST");

            String idList = new Gson().toJson(mobileIdList);

            String strJsonBody = "{"
                    +   "\"app_id\": \"APPIDREMOVED\","
                    +   "\"include_player_ids\": "+idList+","
                    +   "\"data\": {\"foo\": \"bar\"},"
                    +   "\"contents\": {\"en\": \"New questions available!\"}"
                    + "}";


            System.out.println("strJsonBody:\n" + strJsonBody);

            byte[] sendBytes = strJsonBody.getBytes("UTF-8");
            con.setFixedLengthStreamingMode(sendBytes.length);

            OutputStream outputStream = con.getOutputStream();
            outputStream.write(sendBytes);

            int httpResponse = con.getResponseCode();
            System.out.println("httpResponse: " + httpResponse);

            if (  httpResponse >= HttpURLConnection.HTTP_OK
                    && httpResponse < HttpURLConnection.HTTP_BAD_REQUEST) {
                Scanner scanner = new Scanner(con.getInputStream(), "UTF-8");
                jsonResponse = scanner.useDelimiter("\\A").hasNext() ? scanner.next() : "";
                scanner.close();
            }
            else {
                Scanner scanner = new Scanner(con.getErrorStream(), "UTF-8");
                jsonResponse = scanner.useDelimiter("\\A").hasNext() ? scanner.next() : "";
                scanner.close();
            }
            System.out.println("jsonResponse:\n" + jsonResponse);
        } catch (Throwable t) {
            t.printStackTrace();
        }

    }