try {

                URL url = new URL(baseURL+ "/sortbyname");
                HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();

                //sortbyname: 2-name
                JSONObject jsonParam = new JSONObject();
                jsonParam.put("username", params[1]);

                urlConnection.setDoOutput(true);
                urlConnection.setRequestProperty("Content-Type", "application/json");
                urlConnection.setRequestMethod("POST");
                urlConnection.connect();

                DataOutputStream wr = new DataOutputStream(urlConnection.getOutputStream());
                wr.writeBytes(jsonParam.toString());
                wr.flush();
                wr.close();

                int response_code = urlConnection.getResponseCode();

                // Check if successful connection made
                if (response_code == HttpURLConnection.HTTP_OK) {

                    // Read data sent from server
                    InputStream input = urlConnection.getInputStream();
                    BufferedReader reader = new BufferedReader(new InputStreamReader(input));
                    StringBuilder result = new StringBuilder();
                    String line;

                    while ((line = reader.readLine()) != null) {
                        result.append(line);
                    }

                    // Parse JSON object and return it
                    JSONObject obj = new JSONObject(result.toString());
                    if(obj.getString("success").equals("false")){
                        return (obj.getString("errormsg").toString());
                    }
                    else {
                        JSONArray arr = obj.getJSONArray("users");
                        int length = arr.length();
                        if(length == 0){
                            return "empty";
                        }
                        String usernames_list = "";
                        for(int i = 0; i<length; i++){
                            String username = arr.getJSONObject(i).getString("name");
                            usernames_list = usernames_list + username + ",";
                        }
                        return usernames_list;
                    }
                } else {

                    return ("unsuccessful");
                }

            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (JSONException e) {
                e.printStackTrace();
            }