I'm trying to raise the version of Traefik I'm building on Kubernetes from v1 to v2.
I was able to update itself, but when I try to use the application after updating the Traefik version to v2, I get a CORS error.
I checked the documentation and found that CORS can be configured in the middleware configuration, so I configured it as follows.
trying to access
[http.middlewares] [http.middlewares.testHeader.headers] accessControlAllowMethods= ["GET", "OPTIONS", "PUT", "POST", "DELETE"] accessControlAllowOriginList = ["https://*.example.com"] accessControlMaxAge = 100 addVaryHeader = true
- ingress setting
apiVersion: networking.k8s.io/v1beta1 kind: Ingress metadata: name: example-app labels: app.kubernetes.io/name: example-app annotations: ingress.kubernetes.io/whitelist-x-forwarded-for: "true" ingress.kubernetes.io/protocol: https traefik.ingress.kubernetes.io/router.tls: "true" kubernetes.io/ingress.class: traefik spec: rules: - host: backend.example.com http: paths: - path: / pathType: ImplementationSpecific backend: serviceName: example-app servicePort: 443
but this problem not sloved.
When I checked the error, I found that the preflight had failed.
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.
I would like to know if there is any part of the problem and if there are any other settings that need to be made.