No way to know what websocket is being close.

[Delaney]

With a normal HttpServer you can transform a request into a websocket like this.

WebSocketTransformer.upgrade(request).then((WebSocket websocket) {
    onWebSocketConnected(websocket);
    websocket.listen((data){
      onWebSocketDataReceived(websocket,data);
    },onDone:(){
      onWebSocketClosed(websocket);
    });
  });

Notice that I can still access the websocket during the closing. This allows for handling of temp data (session-ish things) to be cleared once the socket closes. I would really like to use start for its clean semantics and want to know how to get this information properly within start's framework.

[Yehor Lvivski]

Thanks for the idea, added two more streams, like the client-side web sockets have. See example/app.dart for the reference.