运行登录的时候后台报错 这算是什么错误?

Question

Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Filtered request failed.] with root cause

java.net.ConnectException: Connection refused: connect

运行登录的时候后台报这个错误,然后前台是报

Access to XMLHttpRequest at 'http://localhost:56700/sys/login' from origin 'http://localhost:8080' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: It does not have HTTP ok status.
Failed to load resource: net::ERR_FAILED
Uncaught (in promise) 请求后出现错误,错误是:Error: Network Error

这个错误,就是找不到问题所在,有大佬解答yi'xia'me

Answer 1

提示请求了本地8080、56700端口，看看端口是否正常。