Firefox 6 uses the latest spec. So it's active in the wild already. I don't think reverse proxies are that big a deal personally, as you as a website owner hav

Firefox 6 uses the latest spec. So it's active in the wild already. I don't think reverse proxies are that big a deal personally, as you as a website owner have control of that part of the system. If the reverse proxy can't deal with it, fix it so it can or use a different one or write your own. There's certainly ISPs out there that proxy all HTTP through their own cache/proxies and fallover with previous spec websocket. Of course the alternative is just to use HTTPS.