Consider supporting or documenting how to access challenges through Websockets

[C0deH4cker]

It would be very nice to host challenges both on bare TCP ports and also as Websocket routes. Websockets seem to be one of the easiest ways to route the challenge traffic through an encrypted tunnel. It would also help with creating fancy web challenges in PwnableHarness. Likely, the bulk of the work would be in an nginx config, but I should at least consider documenting how to do it or even create an example.