- Windows runtime endpoints is now switched to `npipe:////./pipe/dockershim` from `tcp://localhost:3735`. ([#69516](https://github.com/kubernetes/kubernetes/pull/69516), [@feiskyer](https://github.com/feiskyer))

* Kubernetes server components using `kubeconfig` files no longer default to `http://localhost:8080`.  Administrators must specify a server value in their kubeconfig files. ([#30808](https://github.com/kubernetes/kubernetes/pull/30808), [@smarterclayton](https://github.com/smarterclayton))

- kubeadm: use etcd's /health endpoint for a HTTP liveness probe on localhost instead of having a custom health check using etcdctl ([#81385](https://github.com/kubernetes/kubernetes/pull/81385), [@neolit123](https://github.com/neolit123))

    * kubeadm - Ensure that the etcd certificates are generated using a proper CN
    * kubeadm - Update generated etcd peer certificate to include localhost addresses for the default configuration.
    * kubeadm - Increase the manifest update timeout to make upgrades a bit more reliable.

- Updated `kube-openapi` to remove invalid defaults: OpenAPI spec no longer includes...

    String tconHostName = null;

    SmbTransport(final UniAddress address, final int port, final InetAddress localAddr, final int localPort) {
        this.address = address;
        this.port = port;
        this.localAddr = localAddr;
        this.localPort = localPort;
    }

    synchronized SmbSession getSmbSession() {
        return getSmbSession(new NtlmPasswordAuthentication(null, null, null));
    }

  }

  @Throws(IOException::class)
  override fun createSocket(
    host: String,
    port: Int,
    localAddress: InetAddress,
    localPort: Int,
  ): Socket {
    val socket = delegate.createSocket(host, port, localAddress, localPort)
    return configureSocket(socket)
  }

  @Throws(IOException::class)
  override fun createSocket(
    host: InetAddress,
    port: Int,
  ): Socket {

  }

  @Throws(IOException::class)
  override fun createSocket(
    host: String,
    port: Int,
    localAddress: InetAddress,
    localPort: Int,
  ): SSLSocket {
    val sslSocket = delegate.createSocket(host, port, localAddress, localPort) as SSLSocket
    return configureSocket(sslSocket)
  }

  @Throws(IOException::class)
  override fun createSocket(
    host: InetAddress,
    port: Int,

## Changelog since v1.26.4

## Changes by Kind

### API Change

- Added error handling for seccomp localhost configurations that do not properly set a localhostProfile ([#117020](https://github.com/kubernetes/kubernetes/pull/117020), [@cji](https://github.com/cji)) [SIG API Machinery and Node]

            ),
          localPort = 80,
        ),
      )
    val request = RecordedRequest(DEFAULT_REQUEST_LINE_HTTP_1, headers, emptyList(), 0, ByteString.EMPTY, 0, 0, socket)
    assertThat(request.url.toString()).isEqualTo("http://host-from-header.com/")
  }

  private class FakeSocket(
    private val localAddress: InetAddress,
    private val localPort: Int,