public String tokenRequest(String email, String password) {
  final URL url = new URL("https://www.dwily.com/api/user/sign_in");
  final String data = URLEncoder.encode("email", "UTF-8").concat("=")
                      .concat(URLEncoder.encode(email, "UTF-8")).concat("&")
                      .concat(URLEncoder.encode("password", "UTF-8")).concat("=")
                      .concat(URLEncoder.encode(password, "UTF-8"));

  final URLConnection connection = url.openConnection();
  connection.setDoOutput(true);
  final OutputStream outputStream = connection.getOutputStream();
  final OutputStreamWriter outputStreamWriter = new OutputStreamWriter(outputStream);
  outputStreamWriter.write(data);
  outputStreamWriter.flush();

  final BufferedReader rd = new BufferedReader(new InputStreamReader(connection.getInputStream()));

  final StringBuffer stringBuffer = new StringBuffer();
  String line;
  while ((line = rd.readLine()) != null) {
    stringBuffer.append(line);
  }
  outputStreamWriter.close();
  rd.close();

  return stringBuffer.toString();
}