项目跑起来了，但是登录接口报504，登录不了 。
$ npm run dev

> vue-koa-demo@1.0.0 dev C:\Users\Administrator\Desktop\2017.6\vue-koa-demo
> node build/dev-server.js

[HPM] Proxy created: /auth  ->  http://localhost:8889
[HPM] Proxy created: /api  ->  http://localhost:8889
> Starting dev server...
 DONE  Compiled successfully in 8258ms12:41:49

> Listening at http://localhost:8080

**[HPM] Error occurred while trying to proxy request /auth/user from localhost:8080 to http://localhost:8889 (ECONNREFUSED) (https://nodejs.org/api/errors.html#errors_common_system_errors)**

配置了自己的mysql密码，这是什么原因导致的呢。
