If you don't serve the same content on :80 and :443. For example, you might be running a Tor relay node which would serve the node directory list on :443 to he

If you don't serve the same content on :80 and :443. For example, you might be running a Tor relay node which would serve the node directory list on :443 to help people bypass firewalls, but also be using it as a useful and legitimate web server in order to prevent organizations from blocking it wholesale.