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In Socket.IO v2, the Socket query option was appended to the namespace
in the CONNECT packet:
{
type: 0,
nsp: "/my-namespace?abc=123"
}
Note: the "query" option on the client-side (v2) will be found in the
"auth" attribute on the server-side:
```
// client-side
const socket = io("/nsp1", {
query: {
abc: 123
}
});
socket.query = { abc: 456 };
// server-side
const io = require("socket.io")(httpServer, {
allowEIO3: true // enable compatibility mode
});
io.of("/nsp1").on("connection", (socket) => {
console.log(socket.handshake.auth); // { abc: 456 } (the Socket query)
console.log(socket.handshake.query.abc); // 123 (the Manager query)
});
More information here: https://socket.io/docs/v3/migrating-from-2-x-to-3-0/#Add-a-clear-distinction-between-the-Manager-query-option-and-the-Socket-query-option
Related: https://github.com/socketio/socket.io/issues/3791