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A Socket.IO client requires a Socket.IO server to communicate. The echo.websocket.org
is a plain WebSocket server and cannot be connected to using a Socket.IO client.
If you want to connect to echo.websocket.org
you are looking for the WebSocket API. Perhaps you are only trying to use the echo
server for testing, and would like to use Socket.IO. In that case I recommend setting up your own Socket.IO server.
Source:stackexchange.com