/**
 * Runs MockWebServer for the duration of a single test method.
 *
 * Specifically while junit instances passes into test constructor
 * are typically shares amongst all tests, a fresh instance will be
 * received here. Use with @BeforeAll and @AfterAll, is not supported.
 *
 * There are 3 ids for instances
 * - The test instance default (passed into constructor)

  return OkHttpClient.Builder()
    .connectionSpecs(listOf(*specs))
    .build()
}

private fun sendRequest(
  client: OkHttpClient,
  url: String,
) {
  System.out.printf("%-40s ", url)
  System.out.flush()
  println(Platform.get())
  val request =
    Request.Builder()
      .url(url)
      .build()
  try {
    client.newCall(request).execute().use { response ->
      val handshake = response.handshake

  @Throws(IOException::class)
  fun size(): Long = cache.size()

  /** Max size of the cache (in bytes). */
  fun maxSize(): Long = cache.maxSize

  @Throws(IOException::class)
  override fun flush() {
    cache.flush()
  }

  @Throws(IOException::class)
  override fun close() {
    cache.close()
  }

  @get:JvmName("directory")
  val directory: File
    get() = cache.directory.toFile()

    connection.connect()
    val out = connection.outputStream
    val data = ByteArray(1024 * 1024)
    var i = 0
    while (i < 1024) {
      try {
        out.write(data)
        out.flush()
        if (i == 513) {
          // pause slightly after halfway to make result more predictable
          Thread.sleep(100)
        }
      } catch (e: IOException) {
        break
      }
      i++

          return null
        }

        override fun writeTo(sink: BufferedSink) {
          sink.writeUtf8("abc")
          sink.flush()
          makeFailingCall()
          sink.writeUtf8("def")
          sink.flush()
        }
      }
    val call =
      client.newCall(
        Request(
          url = server.url("/"),
          body = requestBody,
        ),

      if (byteCount > length) writeContinuationFrames(streamId, byteCount - length)
    }
  }

  @Throws(IOException::class)
  fun flush() {
    this.withLock {
      if (closed) throw IOException("closed")
      sink.flush()
    }
  }

  @Throws(IOException::class)
  fun rstStream(
    streamId: Int,
    errorCode: ErrorCode,
  ) {
    this.withLock {

  override fun write(
    source: Buffer,
    byteCount: Long,
  ) {
    var bytesLeft = byteCount

    while (bytesLeft > 0) {
      if (bytesWrittenSinceLastDelay == bytesPerPeriod) {
        flush()
        sleepNanos(periodDelayNanos)
        bytesWrittenSinceLastDelay = 0
      }

      val toWrite = minOf(bytesLeft, bytesPerPeriod - bytesWrittenSinceLastDelay)
      bytesWrittenSinceLastDelay += toWrite

  names: List<String>,
) {
  var time = System.currentTimeMillis()
  for (dns in dnsProviders) {
    println("Testing ${dns.url}")
    for (host in names) {
      print("$host: ")
      System.out.flush()
      try {
        val results = dns.lookup(host)
        println(results)
      } catch (uhe: UnknownHostException) {
        var e: Throwable? = uhe
        while (e != null) {
          println(e)

Some requests will have a cached response. When this cached response isn’t fresh, OkHttp can do a _conditional GET_ to download an updated response if it’s newer than what’s cached. This requires headers like `If-Modified-Since` and `If-None-Match` to be added.

## Rewriting Responses

    // Stalling the socket will cause TWO requests to time out!
    server.enqueue(MockResponse(socketPolicy = StallSocketAtStart))

    // The 3rd request should be sent to a fresh connection.
    server.enqueue(
      MockResponse(body = "fresh connection"),
    )

    // The first call times out.
    val call1 = client.newCall(Request(server.url("/")))
    assertFailsWith<IOException> {
      call1.execute()