How to know if a connection is actually closed?

[glwbr]

I'm using Wave for handling PaymentNotifications (OrderConfirmations). When an order is updated, I send an Event to my frontend (Vue.js), triggering some actions. However, in production, we observed an increase in server resource consumption after deploying this strategy. Is there a way to ensure that a connection is properly closed? Currently, I'm testing a setTimeout to close the connection on the frontend, but I'm unsure if this is effective.

[slavarazum]

To drop stale connections, Wave uses a ping event. By default, it sends a ping event for every new SSE connection if the last event was earlier than 30 seconds. Check PingConnections middleware.
If you need to close slate connections more frequently, you can manual control the ping event.