Ah, nice! Thank you. So I'm trying to work out what the minimum "normal" API would be for using this (via Snap or WAI, for example). What I'm coming up with is that first of all, the following would be used in the integration layer: data Request data Response handshake runWebSockets The interface to the application programmer is less clear. Is the expectation that you'd use the WebSocketData type class? But then the abstraction looks a bit weak since you have to think in terms of text or data frames anyway... so ignoring that, the following looks closest to what I'd want: data WebSockets a data DataMessage sendDataMessage receiveDataMessage and a new export: getDataMessageSender :: WebSockets (DataMessage -> IO ()) getDataMessageSender = fmap ($ dataMessage) getSender to use with a forkIO. Is this something like what you'd expect people to do? -- Chris