问题描述：
安装font awesome 6 之后域名带上www访问就报跨域错误，不带www.就没问题是什么原因
报错内容：
Access to XMLHttpRequest at 'https://finkiin.com.cn/login' from origin 'https://www.finkiin.com.cn' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.