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()) {
            // Prepare a duplex body so that the application can send a request body later.

  }

  override fun requestFailed(
    call: Call,
    ioe: IOException,
  ) {
    logWithTime("requestFailed: $ioe")
  }

  override fun responseHeadersStart(call: Call) {
    logWithTime("responseHeadersStart")
  }

  override fun responseHeadersEnd(
    call: Call,
    response: Response,
  ) {
    logWithTime("responseHeadersEnd: $response")
  }

    call: Call,
    ioe: IOException,
  ) {
    logWithTime("requestFailed: $ioe")

    delegate.requestFailed(call, ioe)
  }

  override fun responseHeadersStart(call: Call) {
    logWithTime("responseHeadersStart")

    delegate.responseHeadersStart(call)
  }

  override fun responseHeadersEnd(
    call: Call,
    response: Response,
  ) {
    logWithTime("responseHeadersEnd: $response")

0.587 connectionAcquired
0.588 requestHeadersStart
0.590 requestHeadersEnd
0.591 responseHeadersStart
0.675 responseHeadersEnd
0.676 responseBodyStart
0.679 responseBodyEnd
0.679 connectionReleased
0.680 callEnd
REQUEST 2 (pooled connection)
0.000 callStart
0.001 connectionAcquired
0.001 requestHeadersStart
0.001 requestHeadersEnd
0.002 responseHeadersStart
0.082 responseHeadersEnd
0.082 responseBodyStart
0.082 responseBodyEnd

    try {
      codec.finishRequest()
    } catch (e: IOException) {
      eventListener.requestFailed(call, e)
      trackFailure(e)
      throw e
    }
  }

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

  @Throws(IOException::class)
  fun readResponseHeaders(expectContinue: Boolean): Response.Builder? {
    try {
      val result = codec.readResponseHeaders(expectContinue)

01-01 12:53:32.811 10999 11089 D OkHttp  : [49 ms] connectionReleased
01-01 12:53:32.811 10999 11089 D OkHttp  : [49 ms] callEnd
01-01 12:53:32.816 10999 11090 D OkHttp  : [54 ms] responseHeadersStart
01-01 12:53:32.816 10999 11090 D OkHttp  : [54 ms] responseHeadersEnd: Response{protocol=h2, code=200, message=, url=https://1.1.1.1/dns-query?dns=AAABAAABAAAAAAAAA3d3dwhmYWNlYm9vawNjb20AAAEAAQ}

  override fun requestFailed(
    call: Call,
    ioe: IOException,
  ) = logEvent(RequestFailed(System.nanoTime(), call, ioe))

  override fun responseHeadersStart(call: Call) = logEvent(ResponseHeadersStart(System.nanoTime(), call))

  override fun responseHeadersEnd(
    call: Call,
    response: Response,
  ) = logEvent(ResponseHeadersEnd(System.nanoTime(), call, response.headers.byteCount()))

    }

    @Override public void requestFailed(Call call, IOException ioe) {
      printEvent("requestFailed");
    }

    @Override public void responseHeadersStart(Call call) {
      printEvent("responseHeadersStart");
    }

    @Override public void responseHeadersEnd(Call call, Response response) {
      printEvent("responseHeadersEnd");
    }

    }

    @Override public void requestFailed(Call call, IOException ioe) {
      printEvent("requestFailed");
    }

    @Override public void responseHeadersStart(Call call) {
      printEvent("responseHeadersStart");
    }

    @Override public void responseHeadersEnd(Call call, Response response) {
      printEvent("responseHeadersEnd");
    }

  }

  data class ResponseHeadersStart(
    override val timestampNs: Long,
    override val call: Call,
  ) : CallEvent()

  data class ResponseHeadersEnd(
    override val timestampNs: Long,
    override val call: Call,
    val headerLength: Long,
  ) : CallEvent() {
    override fun closes(event: CallEvent): Boolean = event is ResponseHeadersStart && call == event.call
  }