- RewriteRule /intro/cn/unsetlang/(.*) /$2 [last,redirect,cookie=lang:invalid:www.debian.org:-1:/:secure:]
+ RewriteRule /intro/cn/unsetlang/(.*) /$1 [last,redirect,cookie=lang:invalid:%{HTTP_HOST}:-1:/:secure:]
+ RewriteCond %{HTTP_COOKIE} /^lang=([a-z]{2}(?:-[a-z]{2})?)$/
+ RewriteRule . - [cookie=lang:%1:%{HTTP_HOST}:40320:/:secure:]