.htaccess правила

Додати www до домену

RewriteEngine On
RewriteCond %{HTTP_HOST} ^devreadwrite.com [NC]
RewriteRule ^(.*)$ http://www.devreadwrite.com/$1 [L,R=301]

Прибрати www з домену

RewriteEngine On
RewriteCond %{HTTP_HOST} !^devreadwrite.com$ [NC]
RewriteRule ^(.*)$ http://devreadwrite.com/$1 [L,R=301]