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Socket.IO aims to make realtime apps possible in every browser and mobile device, blurring the differences between the different transport mechanisms.

Socket.IO does more than WebSocket, even if WebSocket is selected as the transport and the user is browsing your website with an ultra modern browser. Certain features like heartbeats, timeouts and disconnection support are vital to realtime applications but are not provided by the WebSocket API out of the box.

This is akin to jQuery’s decision of creating a feature-rich and simple $.ajax API as opposed to normalizing XMLHttpRequest.

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