As it seems there is no easy way to comment on a JDK bug:
After testing what was written in the comment of
https://bugs.java.com/bugdatabase/view_bug?bug_id=JDK-8361305
I think the writer is correct, everything works as expected/specified
here. I wrongly assumed ws:// would do something different but can
confirm that using ws:// instead of http works. One might argue that
http can be an alias to ws:// but I'm not sure its worth a change here
as it is only a little inconvenience to have to use two different URI if
the endpoint supports both http+ws
