Issue with Session ID in Socket.io using Long Polling

[asijoumi]

Hi,

I am currently using NestJS for my backend and managing multiple servers. For load balancing, I have configured Nginx according to the Socket.io documentation on using multiple nodes with Nginx: https://socket.io/docs/v4/using-multiple-nodes/#nginx-configuration.

Additionally, I have implemented the Redis adapter as described here: https://socket.io/docs/v4/redis-adapter.

However, I am encountering an issue with long polling where I intermittently receive a Session ID unknown error. While some requests return a successful response, others result in a bad request error.

Could you confirm if Socket.io stores the Session ID in Redis when using the Redis adapter? Any guidance on resolving this issue would be greatly appreciated.

Thank you.