title: How redirect to mobile version of site without changing URL?
body: <p>i'm trying to redirect my mobile users and all of small devices users to my mobile version of web site.
  but i don't like change my URL.
  like below example ,</p>
  
  <p>desktop version : domain.com ( with desktop version of site )</p>
  
  <p>mobile version : domain.com ( with mobile version of site )</p>