.heldCertificate(serverCertificate)
    .build();
MockWebServer server = new MockWebServer();
server.useHttps(serverCertificates.sslSocketFactory(), false);
server.requestClientAuth();
server.enqueue(new MockResponse());

// Create a client certificate and a client that uses it.
HeldCertificate clientCertificate = new HeldCertificate.Builder()
    .commonName("ianmalcolm")

        .heldCertificate(serverCertificate)
        .build()
    server.useHttps(serverHandshakeCertificates.sslSocketFactory(), false)
    server.enqueue(MockResponse().setBody("abc"))
    server.requestClientAuth()
    val clientCertificate =
      HeldCertificate
        .Builder()
        .signedBy(clientCa)
        .build()
    val clientHandshakeCertificates =
      HandshakeCertificates
        .Builder()

        .build()
    server.useHttps(serverHandshakeCertificates.sslSocketFactory())
    server.enqueue(
      MockResponse
        .Builder()
        .body("abc")
        .build(),
    )
    server.requestClientAuth()
    val clientCertificate =
      HeldCertificate
        .Builder()
        .signedBy(clientCa)
        .build()
    val clientHandshakeCertificates =
      HandshakeCertificates
        .Builder()

   * certificate at all! But if the client presents an untrusted certificate the handshake
   * will fail and no connection will be established.
   */
  public fun requestClientAuth() {
    this.clientAuth = CLIENT_AUTH_REQUESTED
  }

  /**
   * Configure the server to [need client auth][SSLSocket.setNeedClientAuth]. If the