Why socket.IO can't work?

Questions & Answers
1

I try to communicate with Socket.IO in Unity which connect to Node.js Server.
Server runs at “localhost:3000” but I couldn’t connect to server with Unity.
Please help me.

2

Please send me Socket.IO library. I am using 2022.3.1f1 unity version. Please help me.
I don’t use WebGL.
Thanks.