htaccess 301 redirect non-www to www

To always redirect users to the www site (for example: http://dotboost.com to http://www.dotboost.com), add the following lines to .htaccess, right after RewriteEngine On:

RewriteCond %{HTTP_HOST} ^dotboost.com
RewriteRule ^(.*)$ http://www.dotboost.com/$1 

If, on the other hand, you want to redirect http://www.dotboost.com to http://dotboost.com, add the following lines instead:

RewriteCond %{HTTP_HOST} ^www.dotboost.com
RewriteRule ^(.*)$ http://dotboost.com/$1 

Replace dotboost.com with your site's domain.