[undertow-dev] Proxy Server with WebSocket Support?

How difficult would it be to write a proxy server that proxies to a web server that takes advantage of WebSockets? I've been looking through the documentation and though there is easy access to proxying and direct support for WebSockets, I can't see a clear path to integrate the two to create a proxy server that proxies to a web server that utilizes WebSockets. Any examples, tutorials, links, sample code, etc. is greatly appreciated. Thanks, Matt Hicks