出现于异常404
出现于异常404，热部署成功，但是自动重新加载后页面就404
页面信息如下：
Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.
Sat Aug 31 11:40:17 CST 2019
There was an unexpected error (type=Not Found, status=404).
No message available
求解
