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I mean why at first place polling and server events exist if websocket can not only solve the problems they are solving but also allow additional functionalities (like bidirectional nature). I guess it has to do something with security and efficiency but on searching I couldn't find any technically subjective explanation to it. The question may sound stupid but I thought to ask rather being confused.

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  • The question should focus on one problem only.
    – Romeo Ninov
    Commented Feb 18 at 6:41

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It is just historical evolution. Long-polling was a solution available with a standard HTTP protocol and has been widely used since Web 2.0 (2000s). SSE was invented specifically for server push and was first implemented in Opera in 2006. WebSocket protocol is a more universal solution first implemented in Chrome in 2009.

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