Socket.io is not working after packing to exe

[damonsong]

Socket.io is not working after packing by using "yarn electron: builld".

However, the function is normal in development mode "yarn electron: serve". And normal for yarn server or yarn build.

I found the reason is socket client cannot be connected to server since the Invaild namespace.
The invaild namespace is "//app://.". I found the value by adding console for socket instance.
The normal namespace is "/" as default main namespace based on socket.io online document.

My question is that why the socket.io default namespace is changed to "//app://."? Any configuration file should be modified?