Redirect www to non www version of site
It’s best to stick with either always using www.example.com or just example.com. Allowing both can confuse the search engines. So here’s how to force your site to always show the non-www version. (Search for “canonical url errors” in your favorite search engine for more info.)
Note: If you do use either of the next 2 codes below, and use a secure server (ie. https:) be sure to check that it doesn’t redirect the secure to the insecure version. I’m pretty sure this will do that and that isn’t something you want!
Options +FollowSymLinks
RewriteEngine on
RewriteCond %{HTTP_HOST} .
RewriteCond %{HTTP_HOST} !^example\.com
RewriteRule (.*) http://example.com/$1 [R=301,L]
Redirect non-www to www
Same as above except in the reverse, this one forces the www. into your url.
Options +FollowSymLinks
RewriteEngine on
RewriteCond %{HTTP_HOST} ^yoursite.com [NC]
RewriteRule ^(.*)$ http://www.yoursite.com/$1 [L,R=301]