How do I update query/auth on connect?

[FerusAndBeyond]

How can query/auth be updated during reconnect() or connect() to a new namespace? Whenever I try to do this the initially set auth/query is kept:

io(URL, { auth: { token } })
// or
io(URL, { query: { token } })

If I set token to null initially, then in the next namespace I connect to the token will also be null even if I change it. I'm using "socket.io-client": "^4.0.1",

[darrachequesne]

You can update those options in the "reconnect_attempt" event:

socket.io.on("reconnect_attempt", () => {
  socket.io.opts.query.token = 123;
  socket.auth.token = 456;
});

Please note that the query option will be shared between the Socket instances of the same connection.

Reference:

• https://socket.io/docs/v4/client-initialization/#query
• https://socket.io/docs/v4/client-initialization/#auth

[FerusAndBeyond]

Thank you it seems to work. I have another question. What happens when a namespace-socket is disconnected?

First I connect to the socket in a namespace

const sio = io(url, {
                transports: ["websocket", "polling"],
                query: {
                    token: auth.token
                }
            })

Then later I can manually disconnect from the namespace using:

sio.io.disconnect()
sio.close()

When I try to reconnect again using sio.io.connect() a connect-event is not sent to the server. I also tried

sio.io.on("reconnect", function () {
    sio.emit("reconnecting")
});

But the reconnecting event is only sometimes sent, so not sure what is going on.

[FerusAndBeyond]

Okay I think I made it work by changing sio.io.connect() to sio.connect(). What is the difference between the two?

[darrachequesne]

The io object points to the Manager instance, which manages the low-level connection.

The sio object in your example is the Socket instance. A single Manager can be shared by multiple Socket instances (one per namespace).

sio.io.disconnect(); // closes the underlying connection (so all Socket instances disconnect)

sio.close(); // disconnect the given Socket instance (but the Manager may not be closed, if there are other active Socket instances) 

[FerusAndBeyond]

I see. It doesn't seem to work without sio.io.disconnect(), otherwise no reconnection is made.