Can Traefik ForwardAuth authenticate multiple APIs with different URL path?

Question

I'm new to Traefik.

I just implemented Traefik ForwardAuth with my simple auth server. It seems that Traefik ForwardAuth can only manage the service, but can't manage APIs in service.

To give an example:

There's a service SVC with 3 APIs that are: testAPI_1, testAPI_2, testAPI_3. Traefik ForwardAuth can only control who can visit service SVC, but can't control who should visit testAPI_1 and who shouldn't visit testAPI_2. Can Traefik manage API's authorization/authentication?

Here's my service's setting in docker-compose.yml:

  whoami:
    # A container that exposes an API to show its IP address
    image: containous/whoami
    networks:
      - my-net
    labels:
      # set middleware
      - "traefik.http.middlewares.test-auth.forwardauth.address=http://auth-server/whoami"
      - "traefik.http.middlewares.test-auth.forwardauth.trustForwardHeader=true"
      - "traefik.http.middlewares.test-auth.forwardauth.authResponseHeaders=X-Client-ID"
      - "traefik.http.routers.whoami.middlewares=test-auth@docker"
      - "traefik.http.routers.whoami.rule=Path(`/whoami`)"

Any help you can provide is greatly appreciated!