有没有大佬遇到过,前端 vue 下载腾讯云 文件, 有些文件可以正常下载,有些文件却报跨域问题?有没有大佬遇到过?
提示 这个
has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
我试图从我的前端向后端(python、烧瓶和MySql)发出一个POST请求,但是我得到了这个错误消息。
Access to XMLHttpRequest at 'http://127.0.0.1:5000/product' from origin 'http://localhost:3000' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Orig