node线上项目连接mysql出现 504 Gateway Time-Out

var connection = mysql.createConnection({
host : ‘localhost’,
user : ‘root’,
password : ‘123456’,
port: ‘3306’,
database: ‘test’
});

一定别忘了加端口号 ↓

port: ‘3306’,

更多内容请见原文，原文转载自：https://blog.csdn.net/weixin_44519496/article/details/119836299