Hope to configure WebSocket URL based on server URL

[n-arakawa]

URL property of Websocket is used in browser.
I hope there is a way to set the URL based on server-url.

More specifically, I hope that at least the following are taken into account:

• location.host
• location.hostname to have a websocket server in other port
• location.protocol to distinguish between wss and ws

src/lib/components/WebSocket.react.js

        url = url? url : "ws://" + location.host + location.pathname + "ws";
        this.client = new WebSocket(url, protocols);