- Kube-apiserver: redirect responses are no longer returned from backends by default. Set `--aggregator-reject-forwarding-redirect=false` to continue forwarding redirect responses. ([#112331](https://github.com/kubernetes/kubernetes/pull/112331), [@enj](https://github.com/enj)) [SIG API Machinery]

		"Expires",
		"Cache-Control",
		"Content-Language",
		"Content-Disposition",
		"X-Amz-Object-Lock-Mode",
		"X-Amz-Object-Lock-Retain-Until-Date",
		"X-Amz-Object-Lock-Legal-Hold",
		"X-Amz-Website-Redirect-Location",
		"X-Amz-Meta-",
	}

	// compare metadata on both maps to see if meta is identical
	compareMeta1 := make(map[string]string)
	for k, v := range oi1.UserDefined {
		var found bool

* Updates defaultbackend to 1.5 ([#69380](https://github.com/kubernetes/kubernetes/pull/69380), [@bowei](https://github.com/bowei))
* Restrict redirect following from the apiserver to same-host redirects, and ignore redirects in some cases. ([#66516](https://github.com/kubernetes/kubernetes/pull/66516), [@tallclair](https://github.com/tallclair))

* Add OAuth2 redirect page for Swagger UI. This allows having delegated authentication in the Swagger UI docs. For this to work, you need to add `{your_origin}/docs/oauth2-redirect` to the allowed callbacks in your OAuth2 provider (in Auth0, Facebook, Google, etc).
    * For example, during development, it could be `http://localhost:8000/docs/oauth2-redirect`.

*   The `/ui` redirect in kube-apiserver is deprecated and will be removed in Kubernetes 1.10. ([#53046](https://github.com/kubernetes/kubernetes/pull/53046), [@maciaszczykm](https://github.com/maciaszczykm))

* Use full package path for definition name in OpenAPI spec ([#40124](https://github.com/kubernetes/kubernetes/pull/40124), [@mbohlool](https://github.com/mbohlool))
* Follow redirects for streaming requests (exec/attach/port-forward) in the apiserver by default (alpha -> beta). ([#40039](https://github.com/kubernetes/kubernetes/pull/40039), [@timstclair](https://github.com/timstclair))

- Kube-apiserver: redirect responses are no longer returned from backends by default. Set `--aggregator-reject-forwarding-redirect=false` to continue forwarding redirect responses. ([#112330](https://github.com/kubernetes/kubernetes/pull/112330), [@enj](https://github.com/enj)) [SIG API Machinery]

## Dependencies

* Fix issue where masquerade rules are flushed in GCE k8s clusters. ([#56729](https...

- Handle slow CronJob lister in CronJob controller v2 and improve memory footprint. ([#96443](https://github.com/kubernetes/kubernetes/pull/96443), [@alaypatel07](https://github.com/alaypatel07)) [SIG Apps]
- --redirect-container-streaming is no longer functional. The flag will be removed in v1.22 ([#95935](https://github.com/kubernetes/kubernetes/pull/95935), [@tallclair](https://github.com/tallclair)) [SIG Node]

### (No, really, you MUST read this before you upgrade)

- The StreamingProxyRedirects feature and `--redirect-container-streaming` flag are deprecated, and will be removed in a future release. The default behavior (proxy streaming requests through the kubelet) will be the only supported option.