Socket.IO also provides an API for Node.js which parallels the client-side API. Socket.IO simplifies signaling with WebSockets usage but, more importantly, it provides fallbacks to other protocols (AJAX/JSONP polling, iframe, Flash, etc.) in the event that WebSockets are not supported on the browser or server, granting it a wide range of browser compatibility.
https://blog.jscrambler.com/mixed-signals-with-socket-io-and-webrtc/
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