Closes the WebSocket connection. Set the optional code and reason
arguments to send close information to the remote peer. If they are
omitted, the peer will see [WebSocketStatus.NO_STATUS_RECEIVED...
Closes the WebSocket connection. Set the optional code and reason
arguments to send close information to the remote peer. If they are
omitted, the peer will see [WebSocketStatus.NO_STATUS_RECEIVED] code
with no reason.