I would like to show a list of connected users without using Websockets. I thought to use http header

Connection:keep-alive

to get persistent connections. Then, when clients leave the website, they would run a listener handler on beforeunload event in order to notice server that a client is going to leave the list. But, how is server able to notify the rest of connected clients to update their lists? (remember, without using websockets, and if possible, without making clients asking any interval to server)

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