* Returns the concatenation of 8-bit, length prefixed protocol names.
     * http://tools.ietf.org/html/draft-agl-tls-nextprotoneg-04#page-4
     */
    fun concatLengthPrefixed(protocols: List<Protocol>): ByteArray {
      val result = Buffer()
      for (protocol in alpnProtocolNames(protocols)) {
        result.writeByte(protocol.length)
        result.writeUtf8(protocol)
      }
      return result.readByteArray()
    }

    }
  }

  override fun protocol(): Protocol = protocol!!

  override fun toString(): String {
    return "Connection{${route.address.url.host}:${route.address.url.port}," +
      " proxy=${route.proxy}" +
      " hostAddress=${route.socketAddress}" +
      " cipherSuite=${handshake?.cipherSuite ?: "none"}" +
      " protocol=$protocol}"
  }

  companion object {

  }

  @Test
  fun fromJavaNetUrlUnsupportedScheme() {
    // java.net.MalformedURLException: unknown protocol: mailto
    platform.assumeNotAndroid()

    // Accessing an URL protocol that was not enabled. The URL protocol mailto is not tested and
    // might not work as expected. It can be enabled by adding the --enable-url-protocols=mailto
    // option to the native-image command.
    platform.assumeNotGraalVMImage()

        connectTls(sslSocket, connectionSpec)
        user.secureConnectEnd(handshake)
      } else {
        socket = rawSocket
        protocol =
          when {
            Protocol.H2_PRIOR_KNOWLEDGE in route.address.protocols -> Protocol.H2_PRIOR_KNOWLEDGE
            else -> Protocol.HTTP_1_1
          }
      }

      val connection =
        RealConnection(
          taskRunner = taskRunner,

   * [priorResponse] objects, which have its own [priorResponse].
   */
  @get:JvmName("request") val request: Request,
  /** Returns the HTTP protocol, such as [Protocol.HTTP_1_1] or [Protocol.HTTP_1_0]. */
  @get:JvmName("protocol") val protocol: Protocol,
  /** Returns the HTTP status message. */
  @get:JvmName("message") val message: String,
  /** Returns the HTTP status code. */
  @get:JvmName("code") val code: Int,

          .build()

      val response = client.newCall(request).execute()

      response.use {
        assertEquals(Protocol.HTTP_2, response.protocol)
        assertEquals(200, response.code)
        // see https://github.com/google/conscrypt/blob/b9463b2f74df42d85c73715a5f19e005dfb7b802/android/src/main/java/org/conscrypt/Platform.java#L613
        when {

  }

  @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

      val requestBody = request.body

      val connection = chain.connection()
      var requestStartMessage =
        ("--> ${request.method} ${redactUrl(request.url)}${if (connection != null) " " + connection.protocol() else ""}")
      if (!logHeaders && requestBody != null) {
        requestStartMessage += " (${requestBody.contentLength()}-byte body)"
      }
      logger.log(requestStartMessage)

      if (logHeaders) {

      .assertSuccessful()
      .assertCode(200)
  }

  private fun enableProtocol(protocol: Protocol) {
    enableTls()
    client =
      client.newBuilder()
        .protocols(listOf(protocol, Protocol.HTTP_1_1))
        .build()
    server1.protocols = client.protocols
    server2.protocols = client.protocols
  }

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

  private val cacheFs = FakeFileSystem()
  private val bootstrapClient =
    OkHttpClient.Builder()
      .protocols(listOf(Protocol.HTTP_2, Protocol.HTTP_1_1))
      .build()

  @BeforeEach
  fun setUp(server: MockWebServer) {
    this.server = server
    server.protocols = bootstrapClient.protocols
    dns = buildLocalhost(bootstrapClient, false)
  }

  @Test
  fun getOne() {
    server.enqueue(