How do i know if connection is alive with websockets?

Question

I have a webapp, which is running in a browser. That webapp is connected to a server, which uses websockets. So the communication between the server and my client/browser is

Answer 1

3 ways:

• rely on TCP to detect loss of connectivity, which will ultimately pop up in JS onclose event
• send WebSocket pings from server .. browsers will reply with WS pongs, loss of connectivity is probably more robustly detected also on client side
• send app level heartbeats from browser to server, server need to have logic to reply. you can't trigger WS pings from browsers (in JS)