[chat example] How to simulate slow connection?

[mymirai-nikki]

I want to observe in what scenario closeSlow is called, How to simulate slow connection mentioned in websocket/internal/examples/chat/chat.go?:

s := &subscriber{
	msgs: make(chan []byte, cs.subscriberMessageBuffer),
	closeSlow: func() {
		mu.Lock()
		defer mu.Unlock()
		closed = true
		if c != nil {
			c.Close(websocket.StatusPolicyViolation, "connection too slow to keep up with messages")
		}
	},
}

[dkks112313]

Slow connection defined here:
func (cs *chatServer) publish(msg []byte) {
cs.subscribersMu.Lock()
defer cs.subscribersMu.Unlock()

cs.publishLimiter.Wait(context.Background())

for s := range cs.subscribers {
	select {
	case s.msgs <- msg:
	default:
		go s.closeSlow()
	}
}

}

When you send message, program check all subscribers, and before if they not read message, connection is "slow" and close: