RewriteCond %{HTTPS} off
        RewriteCond %{REQUEST_URI} ^/buy$
        RewriteRule ^(.*)$ https://forhangovers.com/buy [R,L]

        RewriteCond %{HTTPS} on
        RewriteCond %{REQUEST_URI} !^/buy
        RewriteRule ^(.*)$ http://forhangovers.com/$1 [R,L]