title: Grails restrict old browsers
body: <p>I'm running in Grails v2.4.4. How can I prevent user access web in the old browsers. This page works only on IE9 or higher. How can I stop them with lower?</p>
  
  <p>I looked on Grails plug in and found <a href="https://grails.org/plugin/browser-detection" rel="nofollow">browser detection plugin</a>. But in seems to work on view site instead of server site.</p>