It's normal https based on SSL. Otherwise it wouldn't work with anything other than custom software.
Discussion
So you still need to use certificates and be bound to certificate authorities, unless you use a self signed one and trust it?
So basically this is "only" (I mean it's a lot) an alternative way to reach a web site? And does the website still need to have a public IP or is the NWS component "pulling" the connection from the relay somehow?