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when I have a notification in my top menu appear a small icon, now I’m trying to figure out how SOF do that. I think it could be using AJAX that check the server every second, that make sense, but with 1000+ user it will overload the servers I think, can someone tell me if I am right, and let me know how can I use a technology like SOF with a live push without breaking the server
You should look into using WebSocket technology. It will work with most recent browsers (Chrome, Firefox, and Safari) and will allow server to push changes to the browser. It’s not supported by Internet Explorer, however, so for that browser Ajax polling is pretty much the only option.