netERR_ CONNECTION_ Refused solution

sockjs-node/info Report errors

GET http://localhost/sockjs-node/info?t=1641268443660 net::ERR_CONNECTION_REFUSED

sockjs-node effect

SockJS is a JavaScript library (for browsers) that provides a WebSocket-like object. SockJS gives you a coherent, cross-browser, Javascript API which creates a low latency, full duplex, cross-domain communication channel between the browser and the web server, with WebSockets or without. This necessitates the use of a server, which this is one version of, for Node.js.
SockJS Provides cross browser JavaScript Of API, Created a low latency 、 Full duplex browser and web Communication channels between servers . It can be understood that our code has been changed and the page has been updated in time

Format of request

http://localhost:[ port ]/sockjs-node/info?t=1641276400161
http://IP:[ port ]/sockjs-node/info?t=1641276400161

reason

Network environment change