问题
I am using flask socket-io for a basic chat app. But I have a problem. When my device connect to server, flask give to device a session id. But after disconnect and again connect, session id changes. So, this device can't receive old room's messages. I thought if I'd do if I assign custom session id to device.Is it true? Or what is your suggestions?
回答1:
The session ids are supposed to be unique, even when a client reconnects. There is no way for an application to choose these ids, they are random numbers chosen by the server.
What you need to do is map a session id to your user information in the connect event, and remove the mapping in the disconnect event. That way at any time you can find out what session id a user is currently on. If you need specific room assignments, those need to be done upon connection, and undone on disconnection.
来源：https://stackoverflow.com/questions/53402185/how-to-use-custom-id-as-session-id-in-flask-socket-io