vue axios post數(shù)據(jù)報(bào)錯(cuò)504

vue文件：

axios.post('/api/nameCheck', {
                name: this.ruleForm2.name
              })
              .then(function (response) {

config/index.js:(target改過(guò)本機(jī)ip:3000和127.0.0.1：3000均失?。?/p>

proxyTable: {
         '/api': {
            target: 'http://localhost:3000/',
            changeOrigin: true,
            // pathRewrite: {
            //   '^/api': ''
            // }
        }
    },

server/app.js:

var users = require('./routes/users');
app.use('/api', users);

routes/users:

router.post('/nameCheck', function(req, res, next) {
    
    return res.send('totally');
});

報(bào)錯(cuò)：POST http://localhost:8089/api/nameCheck 504 (Gateway Timeout)
(node后端已打開(kāi)，用localhost:3000可以正常訪問(wèn)）
[HPM] Error occurred while trying to proxy request /api/nameCheck from localhost:8089 to http://175.8.15x.xx:3000/ (ECONNREFUSED) (https://nodejs.org/api/errors...
(ECONNREFUSED)

（其實(shí)昨天還能連接上的，不知道為什么今天就連不上了。。）
請(qǐng)問(wèn)有具體的解決辦法嗎？