- Kube-apiserver: Made the subresources `pods/exec`, `pods/attach`, and `pods/portforward` require `create` permission for both SPDY and Websocket API requests. Previously, SPDY requests required `create` permission, but Websocket requests only required `get` permission. This change is gated by the `AuthorizePodWebsocketUpgradeCreatePermission`...

- Adds the ExtendWebSocketsToKubelet feature gate (Beta, default true in v1.36). When enabled, the API server proxies WebSocket exec/attach/portforward requests directly to the kubelet rather than translating or tunneling them at the API server. The kubelet now handles WebSocket-to-SPDY stream translation (exec/attach) and WebSocket tunneling (portforward) using the same handlers previously used at the API server. The kubelet advertises support for this feature to the API server via the NodeDeclaredFeatures...

- Enabled feature gates for PortForward (kubectl port-forward) over WebSockets by default (beta).
   - Server-side feature gate: PortForwardWebsocket
   - Client-side (kubectl) feature gate: PORT_FORWARD_WEBSOCKETS environment variable

- Fixes a 1.30+ regression in connection stability for exec / attach / portforward requests initiated using a websocket client ([#130251](https://github.com/kubernetes/kubernetes/pull/130251), [@fuweid](https://github.com/fuweid)) [SIG API Machinery, CLI and Testing]

- Fixes a 1.30+ regression in connection stability for exec / attach / portforward requests initiated using a websocket client ([#130253](https://github.com/kubernetes/kubernetes/pull/130253), [@fuweid](https://github.com/fuweid)) [SIG API Machinery, CLI and Testing]