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What is the concept behind Flash Sockets in JavaScript (like socket.io does)?

I'm interested in Flash sockets and how they can be used in Java Script. socket.io for example can use Flash sockets, but how is this realized ? I think there is no swf file.

At the moment I'm more interested in the concept behind than in code.

The web-socket-js library provides everything that's required to use Flash Socket fallback when the WebSocket object is not natively available.

The README should provide you with all the information you need.

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