websocket-httpbeast.nim

  let headers = req.headers.get()
  # Set up AsyncSocket for use with asyncdispatch.
  req.forget() # Remove from HttpBeast event loop.
  asyncdispatch.register(req.client.AsyncFD)
  let socket = newAsyncSocket(req.client.AsyncFD)

  # Handshake with client.
  let (client, error) =
    await verifyWebsocketRequest(socket, headers, "stardust")
  if error.len != 0:
    game.logs.initialError.labels("negotiation").inc()
    warn("WS negotiation failed: " & error)
    req.send("Websocket negotiation failed: " & error, Http400)
    socket.close()
  else:
    let success = await addPlayer(game, client)

    if not success:
      game.logs.initialError.labels("addPlayer").inc()
      info("Dropping connection due to unsuccessful `addPlayer`")
      await client.close()