Merge pull request #3307 from minrk/wsproto 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. also replaces unused websocket_host with websocket_url Rather than specifying only the hostname, it makes much more sense to specify the whole protocol,host,port in a single go.