fetch跨域问题

Question

Fetch API cannot loadNo 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:5000' is therefore not allowed access. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.同样的ajax，get可以用，但是post就会出现这种问题

Answer 1

协调后端解决，不同语言设置Access-Control-Allow-Origin的方式不同。