Username username;
        username = new Username();
        username.username=email;
        username.password=password;
        StringBuffer response = new StringBuffer();
        Gson gson= new Gson();
        String user_pass_json = gson.toJson(username);


        HttpURLConnection httpConnection = null;
        try{
            URL targetUrl = new URL('http://139.59.241.38/api-token-auth');
            httpConnection = (HttpURLConnection) targetUrl.openConnection();

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


            //Enviando Request
            OutputStream outputStream = httpConnection.getOutputStream();
            outputStream.write(user_pass_json.getBytes());
            outputStream.flush();

            if (httpConnection.getResponseCode() != 200){
                return ("Failed : HTTP error code : " + httpConnection.getResponseCode());
            }

            //Recebendo Response
            InputStream is = httpConnection.getInputStream();
            BufferedReader rd = new BufferedReader(new InputStreamReader(is));

            String line;
            while((line = rd.readLine()) != null) {
                response.append(line);
                response.append('\r');
            }
            rd.close();
            return response.toString();

        }catch (MalformedURLException e) {
            e.printStackTrace();
            return "MalformedURLException";

        } catch (IOException e) {
            e.printStackTrace();
            return ""+httpConnection.getErrorStream ();
        }finally {

            if(httpConnection != null) {
                httpConnection.disconnect();
            }
        }