when (val protocol = sslSocket.applicationProtocol) {
        null, "" -> null
        else -> protocol
      }
    } catch (e: UnsupportedOperationException) {
      // https://docs.oracle.com/javase/9/docs/api/javax/net/ssl/SSLSocket.html#getApplicationProtocol--
      null
    }

  override fun trustManager(sslSocketFactory: SSLSocketFactory): X509TrustManager? {

        }
    }

    /**
     * Returns the normalized protocol.
     *
     * @param protocol
     *            The protocol. Must not be {@literal null} or empty.
     * @return The normalized protocol.
     */
    public static String toCanonicalProtocol(final String protocol) {
        assertArgumentNotEmpty("protocol", protocol);

        final String canonicalProtocol = CANONICAL_PROTOCOLS.get(protocol);

        .message("")
        .protocol(Protocol.HTTP_2)
        .build()
    val listener = loggingEventListenerFactory.create(call)
    listener.cacheConditionalHit(call, response)
    listener.cacheHit(call, response)
    listener.cacheMiss(call)
    listener.satisfactionFailure(call, response)
    logRecorder
      .assertLogMatch(Regex("""cacheConditionalHit: Response\{protocol=h2, code=200, message=, url=$url\}"""))

    dnsResults =
      listOf(
        localhostIpv4,
        localhostIpv6,
        TestUtil.UNREACHABLE_ADDRESS_IPV4.address,
      )
    serverIpv4.protocols = listOf(Protocol.H2_PRIOR_KNOWLEDGE)
    serverIpv6.protocols = listOf(Protocol.H2_PRIOR_KNOWLEDGE)

    // Yield the first IP address so the second IP address completes first.
    val firstConnectLatch = CountDownLatch(1)
    val socketFactory =

  }

  @Test
  fun testH2PriorKnowledgeServerFallback() {
    try {
      server.protocols = Arrays.asList(Protocol.H2_PRIOR_KNOWLEDGE, Protocol.HTTP_1_1)
      fail<Any>()
    } catch (expected: IllegalArgumentException) {
      assertThat(expected.message).isEqualTo(
        "protocols containing h2_prior_knowledge cannot use other protocols: " +
          "[h2_prior_knowledge, http/1.1]",
      )
    }
  }

  @Test

}

public final class okhttp3/Protocol : java/lang/Enum {
	public static final field Companion Lokhttp3/Protocol$Companion;
	public static final field H2_PRIOR_KNOWLEDGE Lokhttp3/Protocol;
	public static final field HTTP_1_0 Lokhttp3/Protocol;
	public static final field HTTP_1_1 Lokhttp3/Protocol;
	public static final field HTTP_2 Lokhttp3/Protocol;
	public static final field HTTP_3 Lokhttp3/Protocol;

 * **Response**: body, cacheControl, cacheResponse, code, handshake, headers, message,
   networkResponse, priorResponse, protocol, receivedResponseAtMillis, request, sentRequestAtMillis
 * **Route**: address, proxy, socketAddress
 * **TlsVersion**: javaName

#### Renamed Functions

* **Headers.of()**: for symmetry with `listOf()`, `setOf()`, etc., we’ve replaced
  `Headers.of(String...)` with `headersOf(vararg String)`.

   */
  private fun enableProtocol(protocol: Protocol) {
    enableTls()
    client =
      client
        .newBuilder()
        .protocols(listOf(protocol, Protocol.HTTP_1_1))
        .build()
    server.protocols = client.protocols
  }

  private fun enableTls() {
    client =
      client
        .newBuilder()

      }

    /**
     * When [protocols][MockWebServer.protocols] include [HTTP_2][okhttp3.Protocol], this attaches a
     * pushed stream to this response.
     */
    public fun addPush(promise: PushPromise): Builder =
      apply {
        this.pushPromises_ += promise
      }

    /**
     * When [protocols][MockWebServer.protocols] include [HTTP_2][okhttp3.Protocol], this pushes

  var connectionSpecs: List<ConnectionSpec> =
    listOf(
      ConnectionSpec.MODERN_TLS,
      ConnectionSpec.COMPATIBLE_TLS,
      ConnectionSpec.CLEARTEXT,
    )
  var protocols: List<Protocol> =
    listOf(
      Protocol.HTTP_1_1,
    )
  var handshakeCertificates: HandshakeCertificates = localhost()
  var sslSocketFactory: SSLSocketFactory? = handshakeCertificates.sslSocketFactory()