HTTP (POST) AJAX calls + SSE is one of the simplest ways to implement bi-directional real time functionality. IMHO this is a much more robust and nicer way than

HTTP (POST) AJAX calls + SSE is one of the simplest ways to implement bi-directional real time functionality. IMHO this is a much more robust and nicer way than web sockets for a huge amount of applications which use web sockets today.