You should redirect all visitors to your website to the "www" top level domain. (Unless, of course, the website is on a subdomain.) The R=301 part ensures search engines will update your search engine listings without penalty.
RewriteEngine On RewriteCond %{HTTP_HOST} !^www\. RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]
Why?
- CloudFlare (via CPanel) filters traffic to "www".
- It will avoid duplicate content (and a penalty) in Google.
- It will avoid splitting page rank or split link popularity (inbound links).