CORS Syntax Not Working?

Traefik Traefik v2
, ,
1

I moved a service from nginx to Traefik 2.9.1 and I can't get it to work on Traefik 2.9.1. The critical part is configuring CORS correctly. In nginx, I just had to add:

if ($request_method = 'OPTIONS') {
    add_header 'Access-Control-Allow-Origin' '*';
    add_header 'Access-Control-Allow-Credentials' 'true';
    add_header 'Access-Control-Allow-Headers' '*';
    add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
    
    add_header 'Content-Type' 'text/plain; charset=utf-8';
    add_header 'Content-Length' 0;
    return 204;
}

if ($request_method = 'GET') {
        add_header 'Access-Control-Allow-Origin' '*';
        add_header 'Access-Control-Allow-Credentials' 'true';
        add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
}

There doesn't seem to be a way to do this with Traefik. Is Traefik just not as flexible as nginx??

This does not work:

apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
  name: cors-headers
  namespace: default
spec:
  headers:
    accessControlAllowMethods:
      - "GET"
      - "OPTIONS"
      - "PUT"
    accessControlAllowHeaders:
      - "*"
    accessControlAllowOriginList:
      - "*"
    accessControlAllowCredentials: true
2

I recommend to add some kubernetes label to your post.

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