I asked him about this yesterday. He said he hasn't used it in awhile but he thought wss:// was implemented in the witness code.
OpenLedger uses a proxy to front several witnesses for load balancing. I tried to implement an nginx proxy to front a local server but as yet I haven't been successful. Need more info on the wss protocol, but haven't had the time to dig into that.
I posted another thread elsewhere on this topic.
Monsterer's post is certainly valid. This is just another example like so many other details that CNX has chosen not to address before launch, due to investor pressure.