- Pod Certificates (beta) now includes a PKCS#10 certificate signing request for wider compatibility with existing certificate authority software. ([#136729](https://github.com/kubernetes/kubernetes/pull/136729), [@ahmedtd](https://github.com/ahmedtd)) [SIG API Machinery, Auth, Node and Testing]

    server.enqueue(MockResponse())

    // Make a first request without certificate pinning. Use it to collect certificates to pin.
    val request1 = Request.Builder().url(server.url("/")).build()
    val response1 = client.newCall(request1).execute()
    val certificatePinnerBuilder = CertificatePinner.Builder()
    for (certificate in response1.handshake!!.peerCertificates) {
      certificatePinnerBuilder.add(

    }

    private fun certificatesToString(certificates: Array<X509Certificate>): String {
      val result: MutableList<String> = ArrayList()
      for (certificate in certificates) {
        result.add(certificate.subjectDN.toString() + " " + certificate.serialNumber)
      }
      return result.toString()
    }
  }

  /**

* Fixes request header authenticator by presenting the request header client CA so that the front proxy will authenticate using its client certificate. ([#40301](https://github.com/kubernetes/kubernetes/pull/40301), [@deads2k](https://github.com/deads2k))

* Resolves x509 verification issue with masters dialing nodes when started with --kubelet-certificate-authority ([#33141](https://github.com/kubernetes/kubernetes/pull/33141), [@liggitt](https://github.com/liggitt))