Imports
- k8s.io/apimachinery/pkg/api/errors
- k8s.io/api/authentication/v1
- k8s.io/apiserver/pkg/endpoints/handlers/responsewriters
- k8s.io/apiserver/pkg/authentication/authenticator
- github.com/emicklei/go-restful
- k8s.io/apiserver/pkg/authentication/token/union