1. First check whether your server is normal 2. There are multiple versions of websocket, and the verification method must be correct
I have written before, there are at least two versions, and finally a round robin is added. As a communication that does not support websocket, any mobile phone or computer browser can communicate directly
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
You should use the front-end library provided by socket.io to connect
1. First check whether your server is normal
2. There are multiple versions of websocket, and the verification method must be correct
I have written before, there are at least two versions, and finally a round robin is added. As a communication that does not support websocket, any mobile phone or computer browser can communicate directly