| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| k8s.io/apimachinery/pkg/api/errors | Package errors provides detailed error types for api field validation. |
| k8s.io/apimachinery/pkg/runtime | Package runtime defines conversions between generic types and structs to map query strings to struct objects. |
| k8s.io/apiserver/pkg/authentication/authenticator | |
| k8s.io/apiserver/pkg/endpoints/request | Package request contains everything around extracting info from a http request object. |
| k8s.io/kubernetes/pkg/apis/authentication | |
| net/http | Package http provides HTTP client and server implementations. |