line application hang after all of the work is done, it may be due to a non-daemon thread like
    this one.
 *  New: Include suppressed exceptions when all routes to a target service fail.


## Version 4.4.1

_2020-03-08_

 *  Fix: Don't reuse a connection on redirect if certs match but DNS does not. For better

   * When we need a new thread to run tasks, we call [Backend.execute]. A few microseconds later we
   * expect a newly-started thread to call [Runnable.run]. We shouldn't request new threads until
   * the already-requested ones are in service, otherwise we might create more threads than we need.
   *
   * We use [executeCallCount] and [runCallCount] to defend against starting more threads than we
   * need. Both fields are guarded by [lock].
   */

      throw AssertionError("Thread ${Thread.currentThread().name} MUST NOT hold lock on $this")
    }
  }

  val logger = Logger.getLogger("TaskFaker." + instance++)

  /** Though this executor service may hold many threads, they are not executed concurrently. */
  private val tasksExecutor = Executors.newCachedThreadPool(threadFactory("TaskFaker"))

  /**

      Thread.currentThread().name = threadName
      try {
        while (true) {
          val socket = serverSocket!!.accept()
          connectionCount.incrementAndGet()
          service(socket)
        }
      } catch (e: SocketException) {
        logger.info("$threadName done accepting connections: ${e.message}")
      } catch (e: IOException) {

    assertThat(cache.size()).isEqualTo(10)

    // Cause the size to grow to 12 should evict 'A'.
    set("c", "c", "c")
    cache.flush()
    assertThat(cache.size()).isEqualTo(8)
    assertAbsent("a")
    assertValue("b", "bb", "bbbb")
    assertValue("c", "c", "c")

    // Causing the size to grow to 10 should evict nothing.
    set("d", "d", "d")
    cache.flush()
    assertThat(cache.size()).isEqualTo(10)

      for (call in runningSyncCalls) {
        call.cancel()
      }
    }
  }

  /**
   * Promotes eligible calls from [readyAsyncCalls] to [runningAsyncCalls] and runs them on the
   * executor service. Must not be called with synchronization because executing calls can call
   * into user code.
   *
   * @return true if the dispatcher is currently running calls.
   */
  private fun promoteAndExecute(): Boolean {

    override fun alternateService(
      streamId: Int,
      origin: String,
      protocol: ByteString,
      host: String,
      port: Int,
      maxAge: Long,
    ) {
      // TODO: register alternate service.
    }
  }

  /** Even, positive numbered streams are pushed streams in HTTP/2. */
  internal fun pushedStream(streamId: Int): Boolean = streamId != 0 && streamId and 1 == 0

  internal fun pushRequestLater(

      }

      else -> {
        toEvict = null
        toEvictIdleAtNs = -1L
      }
    }

    when {
      toEvict != null -> {
        // We've chosen a connection to evict. Confirm it's still okay to be evicted, then close it.
        toEvict.withLock {
          if (toEvict.calls.isNotEmpty()) return 0L // No longer idle.