/** Initialized in [callStart]. */
  private var callStackTrace: Any? = null

  /** Finds an exchange to send the next request and receive the next response. */
  private var exchangeFinder: ExchangeFinder? = null

  var connection: RealConnection? = null
    private set
  private var timeoutEarlyExit = false

  /**

        synchronized(this@Relay) {
          upstreamReader = null
          ******@****.***All()
        }
      }
    }

    override fun timeout(): Timeout = timeout

    @Throws(IOException::class)
    override fun close() {
      if (fileOperator == null) return // Already closed.
      fileOperator = null

      var fileToClose: RandomAccessFile? = null
      synchronized(this@Relay) {
        sourceCount--

    assertThat(callbacks.remove()).isEqualTo(Event(null, null, "third event"))
  }

  @Test
  fun nakedFieldNames() {
    consumeEvents(
      """
      |data
      |
      |data
      |data
      |
      |data:
      |
      """.trimMargin(),
    )
    assertThat(callbacks.remove()).isEqualTo(Event(null, null, ""))

 *         .header("Proxy-Authorization", "secret")
 *         .build();
 *   }
 * }
 * return null; // Didn't find a preemptive auth scheme.
 * ```
 *
 * ## Reactive Authentication
 *
 * Implementations authenticate by returning a follow-up request that includes an authorization
 * header, or they may decline the challenge by returning null. In this case the unauthenticated
 * response will be returned to the caller that triggered it.
 *

   */
  fun takeEvent(
    eventClass: Class<out ConnectionEvent>? = null,
    elapsedMs: Long = -1L,
  ): ConnectionEvent {
    val result = eventSequence.remove()
    val actualElapsedNs = result.timestampNs - (lastTimestampNs ?: result.timestampNs)
    lastTimestampNs = result.timestampNs

    if (eventClass != null) {
      assertThat(result).isInstanceOf(eventClass)
    }

    if (elapsedMs != -1L) {

        if (openJSSE != null) {
          return openJSSE
        }
      }

      // An Oracle JDK 9 like OpenJDK, or JDK 8 251+.
      val jdk9 = Jdk9Platform.buildIfSupported()

      if (jdk9 != null) {
        return jdk9
      }

      // An Oracle JDK 8 like OpenJDK, pre 251.
      val jdkWithJettyBoot = Jdk8WithJettyBootPlatform.buildIfSupported()

      if (jdkWithJettyBoot != null) {

    @JvmField var associatedStreamId = 0

    @JvmField var errorCode: ErrorCode? = null

    @JvmField var windowSizeIncrement: Long = 0

    @JvmField var headerBlock: List<Header>? = null

    @JvmField var data: ByteArray? = null

    @JvmField var settings: Settings? = null

    @JvmField var ack = false

    @JvmField var payload1 = 0

    @JvmField var payload2 = 0

    assertThat(body.string()).isEqualTo(text)
  }

  companion object {
    @JvmOverloads
    fun body(
      hex: String,
      charset: String? = null,
    ): ResponseBody {
      val mediaType = if (charset == null) null else "any/thing; charset=$charset".toMediaType()
      return hex.decodeHex().toResponseBody(mediaType)
    }

    fun exhaust(reader: Reader): String {

        RealConnection(
          taskRunner = taskRunner,
          connectionPool = connectionPool,
          route = route,
          rawSocket = null,
          socket = socket,
          handshake = null,
          protocol = null,
          source = null,
          sink = null,
          pingIntervalMillis = 0,
          ConnectionListener.NONE,
        )
      result.idleAtNs = idleAtNs
      return result
    }

  if (result.containsInvalidLabelLengths()) return null

  return result
}

internal fun idnToAscii(host: String): String? {
  val bufferA = Buffer().writeUtf8(host)
  val bufferB = Buffer()

  // 1. Map, from bufferA to bufferB.
  while (!bufferA.exhausted()) {
    val codePoint = bufferA.readUtf8CodePoint()
    if (!IDNA_MAPPING_TABLE.map(codePoint, bufferB)) return null
  }