if ("100-continue".equals(request.header("Expect"), ignoreCase = true)) {
          exchange.flushRequest()
          responseBuilder = exchange.readResponseHeaders(expectContinue = true)
          exchange.responseHeadersStart()
          invokeStartEvent = false
        }
        if (responseBuilder == null) {
          if (requestBody.isDuplex()) {

  fun finishRequest()

  /**
   * Parses bytes of a response header from an HTTP transport.
   *
   * @param expectContinue true to return null if this is an intermediate response with a "100"
   * response code. Otherwise this method never returns null.
   */
  @Throws(IOException::class)
  fun readResponseHeaders(expectContinue: Boolean): Response.Builder?

  @Throws(IOException::class)
  fun reportedContentLength(response: Response): Long

    stream!!.getSink().close()
  }

  override fun readResponseHeaders(expectContinue: Boolean): Response.Builder? {
    val stream = stream ?: throw IOException("stream wasn't created")
    val headers = stream.takeHeaders(callerIsIdle = expectContinue)
    val responseBuilder = readHttp2HeadersList(headers, protocol)
    return if (expectContinue && responseBuilder.code == HTTP_CONTINUE) {
      null
    } else {

  DISCONNECT_DURING_RESPONSE_BODY,
  DO_NOT_READ_REQUEST_BODY,
  FAIL_HANDSHAKE,
  SHUTDOWN_INPUT_AT_END,
  SHUTDOWN_OUTPUT_AT_END,
  STALL_SOCKET_AT_START,
  NO_RESPONSE,
  RESET_STREAM_AT_START,
  EXPECT_CONTINUE,
  CONTINUE_ALWAYS,

  }

  result.settings(settings)
  result.status = status
  result.headers(headers)
  result.trailers(trailers)
  result.socketPolicy =
    when (socketPolicy) {
      SocketPolicy.EXPECT_CONTINUE, SocketPolicy.CONTINUE_ALWAYS -> {
        result.add100Continue()
        KeepOpen
      }
      SocketPolicy.UPGRADE_TO_SSL_AT_END -> {
        result.inTunnel()
        KeepOpen
      }

  }

  fun responseHeadersStart() {
    eventListener.responseHeadersStart(call)
  }

  @Throws(IOException::class)
  fun readResponseHeaders(expectContinue: Boolean): Response.Builder? {
    try {
      val result = codec.readResponseHeaders(expectContinue)
      result?.initExchange(this)
      return result
    } catch (e: IOException) {
      eventListener.responseFailed(call, e)
      trackFailure(e)

        final URI uri = root.resolve(key.getHashCode());
        HttpPut httpPut = new HttpPut(uri);
        if (useExpectContinue) {
            httpPut.setHeader(HTTP.EXPECT_DIRECTIVE, HTTP.EXPECT_CONTINUE);
        }
        httpPut.addHeader(HttpHeaders.CONTENT_TYPE, BUILD_CACHE_CONTENT_TYPE);
        requestCustomizer.customize(httpPut);

        httpPut.setEntity(new AbstractHttpEntity() {