I can not connect to the socket, can someone tell me?

Question

JavaScript

The client itself tries to do something, but in the end it gets this:
WebSocket connection to 'ws://localhost:8080/socket.io/?EIO=3&transport=websocket&sid=t9HnRyKkQxifBc6jAAAA' failed: Connection closed before receiving a handshake response

Answer 1

I can only assume that port 8080 is already taken by another service on the local host.