Can Ktor SSE heartbeat support a function to get the value instead of a fixed one? I want to include a timestamp when sending heartbeats.

[shaolp]

Currently, the SSE heartbeat event is a fixed value set at configuration time. I need to include a timestamp on each heartbeat, so the heartbeat event should be generated by a suspend function or lambda at runtime, not a static value. Please allow something like:

Thank you for your understanding and cooperation! 🙏

[bjhham]

Hi @shaolp, we don't have anything built in at the moment, but you can launch a looped coroutine from the SSE session with the same effect:

sse {
    launch(CoroutineName("custom-sse-heartbeat")) {
        while (true) {
            send(ServerSentEvent("It is now ${Clock.System.now()} o'clock"))
            delay(10.milliseconds)
        }
    }
}