switch default ws_url logic to js side...
switch default ws_url logic to js side
In some cases (proxies,
#3305), the request object doesn't have the right information about the originating information. This changes the default behavior, so that `ws_url` is generally empty by default, which the javascript takes to mean 'the same as http'. This is simpler and should be more resilient than trying a guess on server-side.
