htaccess Add/Remove the www From Domain URL

Generic code – works for any domain:

Add www:

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

[OR]

RewriteEngine on
rewritecond %{http_host} ^domain.com [nc]
rewriterule ^(.*)$ http://www.domain.com/$1 [r=301,nc]

Remove www:

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