we just added the Strict-Transport-Security HTTP header to wechall.net. This causes that your browser uses https when you access the site via http. This is cached for one day. You are still able to use the unencrypted http connection via curl and other non/old-browsers.
This should be fine for all challenges. If you nevertheless experience some troubles, tell us.
If no problems arise we will probably increase the cache time.
Contact only via c3BhY2VAd2VjaGFsbC5uZXQ= or PM...
Windows can be secure... but only if you don't use it