function handleRequest(request, response)
{
  // avoid confusing cache behaviors
  response.setHeader("Cache-Control", "no-cache", false);
  response.setHeader("Content-Type", "text/plain", false);
  response.setHeader("Access-Control-Allow-Origin", "*", false);

  // used by mobile/desktop user agent tests
  response.write(request.getHeader("User-Agent"));
}