gistfile1.txt

# Force WWW for http
RewriteCond %{HTTPS} off [NC]
RewriteCond %{HTTP_HOST} !^www\.[a-z-]+\.?[a-z]{2,6}? [NC]
RewriteCond %{HTTP_HOST} ([a-z-]+)(\.[a-z]{2,6})?$    [NC]
RewriteRule ^(.*)$ http://www.%1%2/$1 [R=301,L]

# Force WWW for https
RewriteCond %{HTTPS} on [NC]
RewriteCond %{HTTP_HOST} !^www\.[a-z-]+\.?[a-z]{2,6}? [NC]
RewriteCond %{HTTP_HOST} ([a-z-]+)(\.[a-z]{2,6})?$    [NC]
RewriteRule ^(.*)$ https://www.%1%2/$1 [R=301,L]