private fun enableTls() {
    // Generate a self-signed cert for the server to serve and the client to trust.
    // can't use TlsUtil.localhost with a non OpenJSSE trust manager
    val heldCertificate =
      HeldCertificate.Builder()
        .commonName("localhost")
        .addSubjectAlternativeName("localhost")
        .build()
    val handshakeCertificates =
      HandshakeCertificates.Builder()

import okhttp3.OkHttpClientTestRule
import okhttp3.Request
import okhttp3.testing.PlatformRule
import okhttp3.tls.HandshakeCertificates
import okhttp3.tls.HeldCertificate
import okhttp3.tls.internal.TlsUtil.localhost
import org.junit.jupiter.api.BeforeEach
import org.junit.jupiter.api.Test
import org.junit.jupiter.api.extension.RegisterExtension

class MockResponseSniTest {
  @RegisterExtension

 * dashboard to create a client ID and secret for this application.
 *
 * <p>You must configure your Slack API OAuth and Permissions page with a localhost URL like {@code
 * http://localhost:53203/oauth/}, passing the same port to this class’ constructor.
 */
public final class SlackApi {
  private final HttpUrl baseUrl = HttpUrl.get("https://slack.com/api/");

    } catch (IOException e) {
      result.close();
      throw e;
    }
    return result;
  }

  @Override public Socket createSocket(
      String host, int port, InetAddress localHost, int localPort) throws IOException {
    return createSocket(host, port);
  }

  @Override public Socket createSocket(InetAddress host, int port) throws IOException {
    Socket result = createSocket();

    try {

  fun play() {
    check(serverSocket == null)
    serverSocket = ServerSocket()
    serverSocket!!.reuseAddress = false
    serverSocket!!.bind(InetSocketAddress("localhost", 0), 1)
    port = serverSocket!!.localPort
    executor.execute {
      try {
        readAndWriteFrames()
      } catch (e: IOException) {
        ******@****.***uietly()

 */
public class HttpsServer {
  public void run() throws Exception {
    HeldCertificate localhostCertificate = new HeldCertificate.Builder()
        .addSubjectAlternativeName("localhost")
        .build();

    HandshakeCertificates serverCertificates = new HandshakeCertificates.Builder()
        .heldCertificate(localhostCertificate)
        .build();
    MockWebServer server = new MockWebServer();

  @Test fun `choice IP address`() {
    val bytes = "8704c0a80201".decodeHex()
    val localhost = InetAddress.getByName("192.168.2.1").address.toByteString()
    assertThat(CertificateAdapters.generalName.fromDer(bytes))
      .isEqualTo(generalNameIpAddress to localhost)
    assertThat(CertificateAdapters.generalName.toDer(generalNameIpAddress to localhost))
      .isEqualTo(bytes)
  }

  @Test fun `choice dns`() {

    assertThat("https://栃木.jp".toHttpUrl().topPrivateDomain()).isNull()
    assertThat("https://xn--4pvxs.jp".toHttpUrl().topPrivateDomain()).isNull()
    assertThat("https://localhost".toHttpUrl().topPrivateDomain()).isNull()
    assertThat("https://127.0.0.1".toHttpUrl().topPrivateDomain()).isNull()

    // https://github.com/square/okhttp/issues/6109

    assertThat(stringPrep("a\u200Dz")).isEqualTo("az")
  }

  @Test fun caseFolding() {
    assertThat(stringPrep("localhost")).isEqualTo("localhost")
    assertThat(stringPrep("Localhost")).isEqualTo("localhost")
    assertThat(stringPrep("LOCALHOST")).isEqualTo("localhost")
    assertThat(stringPrep("abc123def")).isEqualTo("abc123def")
    assertThat(stringPrep("ß")).isEqualTo("ss")

    [our DevServer sample][dev_server]:

    ```kotlin
    val clientCertificates = HandshakeCertificates.Builder()
        .addPlatformTrustedCertificates()
        .addInsecureHost("localhost")
        .build()

    val client = OkHttpClient.Builder()
        .sslSocketFactory(clientCertificates.sslSocketFactory(), clientCertificates.trustManager)
        .build()
    ```