}

    /**
     * Set the delayed time of the response body to [delay]. This applies to the response body
     * only; response headers are not affected.
     */
    fun bodyDelay(
      delay: Long,
      unit: TimeUnit,
    ) = apply {
      bodyDelayNanos = unit.toNanos(delay)
    }

    fun headersDelay(
      delay: Long,
      unit: TimeUnit,
    ) = apply {

  }

  /**
   * Throttle the request body by sleeping 500ms after every 3 bytes. With a 6-byte request, this
   * should yield one sleep for a total delay of 500ms.
   */
  @Test
  fun throttleRequest() {
    assumeNotWindows()
    server.enqueue(
      MockResponse()
        .throttleBody(3, 500, TimeUnit.MILLISECONDS),
    )

    server.useHttps(handshakeCertificates.sslSocketFactory())
  }

  private inner class DelayedRequestBody(
    private val delegate: RequestBody,
    delay: Long,
    timeUnit: TimeUnit,
  ) : RequestBody() {
    private val delayMillis = timeUnit.toMillis(delay)

    override fun contentType() = delegate.contentType()

    override fun isDuplex() = true

    override fun writeTo(sink: BufferedSink) {

        // Minimise test flakiness due to possible race conditions with connections closing.
        // Some number of tests will report here, but not fail due to this delay.
        println("Delaying to avoid flakes")
        Thread.sleep(500L)
        println("After delay: " + connectionPool.connectionCount())
      }

      connectionPool.evictAll()
      assertEquals(0, connectionPool.connectionCount()) {

      eachQueue@ for (queue in readyQueues) {
        val candidate = queue.futureTasks[0]
        val candidateDelay = maxOf(0L, candidate.nextExecuteNanoTime - now)

        when {
          // Compute the delay of the soonest-executable task.
          candidateDelay > 0L -> {
            minDelayNanos = minOf(candidateDelay, minDelayNanos)
            continue@eachQueue
          }

          return null
        }

        if (retryAfter(userResponse, Integer.MAX_VALUE) == 0) {
          // specifically received an instruction to retry without delay
          return userResponse.request
        }

        return null
      }

      HTTP_MISDIRECTED_REQUEST -> {

    file!!.channel.force(false)

    // This file is complete.
    synchronized(this@Relay) {
      complete = true
    }

    upstream?.closeQuietly()
    upstream = null
  }

  fun metadata(): ByteString = metadata

  /**
   * Returns a new source that returns the same bytes as upstream. Returns null if this relay has
   * been closed and no further sources are possible. In that case callers should retry after

            }
          }
        }
      }

      // Update the connection flow control, as this is a shared resource.
      // Even if our stream doesn't need more data, others might.
      // But delay updating the stream flow control until that stream has been
      // consumed
      updateConnectionFlowControl(byteCount)

      // Notify that buffer size changed

      private val client = OkHttpClient()

      fun run() {
        val request = Request.Builder()
            .url("http://httpbin.org/delay/2") // This URL is served with a 2 second delay.
            .build()

        val startNanos = System.nanoTime()
        val call = client.newCall(request)

        // Schedule a job to cancel the call in 1 second.

      "FINE: Q10000 finished run in   0 µs: task",
    )
  }

  /** Repeat with a delay of 200 but schedule with a delay of 50. The schedule wins. */
  @Test fun executeScheduledEarlierReplacesRepeatedLater() {
    val task =
      object : Task("task") {
        val schedules = mutableListOf(50.µs)
        val delays = mutableListOf(200.µs, -1)

        override fun runOnce(): Long {