解决方法:
nginx.ingress.kubernetes.io/cors-allow-headers: DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization
nginx.ingress.kubernetes.io/cors-allow-methods: PUT, GET, POST, OPTIONS
nginx.ingress.kubernetes.io/cors-allow-origin: '*'
nginx.ingress.kubernetes.io/enable-cors: "true"
参考资料:https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/annotations/#enable-cors