htaccess rule for redirect non www to www.

- You can define following two line just for redirect your non www to wwww, If anyone open your site without www like http://domainname.com then its automatically redirect to  http://www.domainname.com,

- See below example:

RewriteCond %{HTTP_HOST} ^example.com$

RewriteRule (.*) http://www.example.com/$1 [R=301,L]

Enjoy :)