}
      }
    ```

### Handling authentication ([.kt][AuthenticateKotlin], [.java][AuthenticateJava])

OkHttp can automatically retry unauthenticated requests. When a response is `401 Not Authorized`, an `Authenticator` is asked to supply credentials. Implementations should build a new request that includes the missing credentials. If no credentials are available, return null to skip the retry.

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   ([#123611](https://github.com/kubernetes/kubernetes/pull/123611), [@ritazh](https://github.com/ritazh))

### RBAC
* The `attributeRestrictions` field has been removed from the PolicyRule type in the rbac.authorization.k8s.io/v1alpha1 API. The field was not used by the RBAC authorizer. ([#39625](https://github.com/kubernetes/kubernetes/pull/39625), [@deads2k](https://github.com/deads2k))

### AWS

- In the course of admitting a single request, the ValidatingAdmissionPolicy plugin will perform no more than one authorization check per unique authorizer expression. All evaluations of identical authorizer expressions will produce the same decision. ([#116443](https://github.com/kubernetes/kubernetes/pull/116443), [@benluddy](https://github.com/benluddy)) [SIG API Machinery and Testing]

* kube-up: increase download timeout for kubernetes.tar.gz ([#29426](https://github.com/kubernetes/kubernetes/pull/29426), [@justinsb](https://github.com/justinsb))
* Fix RBAC authorizer of ServiceAccount ([#29071](https://github.com/kubernetes/kubernetes/pull/29071), [@albatross0](https://github.com/albatross0))

- Kube-apiserver: Promoted `AuthorizeWithSelectors` feature to beta, which includes field and label selector information from requests in webhook authorization calls. Promoted `AuthorizeNodeWithSelectors` feature to beta, which changes node authorizer behavior to limit requests from node API clients, so that each Node can only get / list / watch its own Node API object, and can also only get / list / watch Pod API objects bound to that node. Clients using kubelet credentials to read other nodes...

    OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY SERVICING,
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    automatically if You fail to comply with terms herein and fail to

- Improves performance of the node authorizer ([#87696](https://github.com/kubernetes/kubernetes/pull/87696), [@liggitt](https://github.com/liggitt)) [SIG Auth]