netERR_CONNECTION_REFUSED 解决大全

sockjs-node/info报错

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

sockjs-node作用

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提供跨浏览器JavaScript的API，创建了一个低延迟、全双工的浏览器和web服务器之间通信通道。可以理解为我们代码改了页面及时热更新了

请求的格式

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

原因

网络环境变更