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Editorial Team
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Asked: 2026-06-09T11:17:18+00:00

I have a webapp, which is running in a browser. That webapp is connected

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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 based on websockets. If some magic event occurs on the server, some webservice sends a new XML / JSON to my webapp and the new data gets displayed.

But how do i, as the client / browser, know if the connection is stil alive? Lets say i do not get any new XML for about 30 seconds. How would i know if the connection is closed/broken/server offline or everything is fine, but on the server himself no new magic event occured.

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1 Answer

  1. Editorial Team

    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)
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