Admin UI amount of clients does not match

[timurkhakhalev]

Hi! I started Performance Load test and as you can see on this screen, clients of websocket and amount of sockets in "namespaces" block does not match.

Can you please explain how "Clients" block count clients and what the difference between clients and sockets section in admin ui?

[darrachequesne]

Hi! This can happen if the clients are connected at the Engine.IO level (low-level), but not at the Socket.IO level.

With curl:

$ curl "http://localhost:3000/socket.io/?EIO=4&transport=polling"
< 0{"sid":"9yeDRtebUcmsY6lvv0T2","upgrades":["websocket"],"pingInterval":300,"pingTimeout":200,"maxPayload":1000000}

// the Engine.IO connection is now considered open

$ curl -X POST "http://localhost:3000/socket.io/?EIO=4&transport=polling&sid=9yeDRtebUcmsY6lvv0T2" -d "40"
< ok
 
// the Socket.IO connection is now considered open (you have entered the main namespace)

In your case, it seems the clients cannot reach the main namespace, is there a middleware preventing the connection?

Reference: https://socket.io/docs/v4/middlewares/

[timurkhakhalev]

What about clients on http long polling transport protocol? Its always 0, but if I open Clients page I can see clients with http long polling protocol