val from = nextAddress
    nextAddress += count
    return (from until nextAddress)
      .map {
        return@map InetAddress.getByAddress(
          Buffer().writeInt(it.toInt()).readByteArray(),
        )
      }
  }

  /** Allocates and returns `count` fake IPv6 addresses like [::ff00:64, ::ff00:65].  */
  fun allocateIpv6(count: Int): List<InetAddress> {
    val from = nextAddress

    }
  }

  private fun assertData(hex: String) {
    assertData(hex.decodeHex())
  }

  private fun assertData(expected: ByteString) {
    val actual = data.readByteString(Math.min(expected.size.toLong(), data.size))
    assertThat(actual).isEqualTo(expected)
  }

  companion object {
    private fun binaryData(length: Int): ByteString {
      val junk = ByteArray(length)
      Random(0).nextBytes(junk)

                var bytesWritten: Long = 0
                while (bytesWritten < contentLength) {
                  val byteCount = Math.min(buffer.size.toLong(), contentLength - bytesWritten).toInt()
                  bytesWritten += byteCount.toLong()
                  sink.write(buffer, 0, byteCount)
                }
              }
            },
        ),
      )
    assertContent("", response)

    assertThat(certificate.serialNumber).isEqualTo(BigInteger.ONE)
    assertThat(certificate.subjectAlternativeNames).isNull()
    val deltaMillis = 1000.0
    val durationMillis = TimeUnit.MINUTES.toMillis((60 * 24).toLong())
    assertThat(certificate.notBefore.time.toDouble())
      .isCloseTo(now.toDouble(), deltaMillis)
    assertThat(certificate.notAfter.time.toDouble())
      .isCloseTo(now.toDouble() + durationMillis, deltaMillis)
  }

  private val timeout =
    object : AsyncTimeout() {
      override fun timedOut() {
        ******@****.***()
      }
    }.apply {
      timeout(client.callTimeoutMillis.toLong(), MILLISECONDS)
    }

  private val executed = AtomicBoolean()

  // These properties are only accessed by the thread executing the call.

  /** Initialized in [callStart]. */

    ) = apply {
      removeHeader("Content-Length")
      headers.add(CHUNKED_BODY_HEADER)

      val bytesOut = Buffer()
      while (!body.exhausted()) {
        val chunkSize = minOf(body.size, maxChunkSize.toLong())
        bytesOut.writeHexadecimalUnsignedLong(chunkSize)
        bytesOut.writeUtf8("\r\n")
        bytesOut.write(body, chunkSize)
        bytesOut.writeUtf8("\r\n")
      }

        responseHeadersBuilder.removeAll(SENT_MILLIS)
        responseHeadersBuilder.removeAll(RECEIVED_MILLIS)
        sentRequestMillis = sendRequestMillisString?.toLong() ?: 0L
        receivedResponseMillis = receivedResponseMillisString?.toLong() ?: 0L
        responseHeaders = responseHeadersBuilder.build()

        if (url.isHttps) {
          val blank = source.readUtf8LineStrict()
          if (blank.isNotEmpty()) {

 */
class HeadersReader(val source: BufferedSource) {
  private var headerLimit = HEADER_LIMIT.toLong()

  /** Read a single line counted against the header size limit. */
  fun readLine(): String {
    val line = source.readUtf8LineStrict(headerLimit)
    headerLimit -= line.length.toLong()
    return line
  }

  /** Reads headers or trailers. */
  fun readHeaders(): Headers {

    assertThat(source.readByteString(prefix.size.toLong())).isEqualTo(prefix)
    assertThat(source.readLong()).isEqualTo(upstreamSize)
    assertThat(source.readLong()).isEqualTo(metadataSize.toLong())
    if (upstream != null) {
      assertThat(source.readUtf8(upstreamSize)).isEqualTo(upstream)
    }
    if (metadata != null) {
      assertThat(source.readByteString(metadataSize.toLong())).isEqualTo(metadata)
    }
    source.close()

      val length = minOf(maxFrameSize - 4L, byteCount).toInt()
      frameHeader(
        streamId = streamId,
        length = length + 4,
        type = TYPE_PUSH_PROMISE,
        flags = if (byteCount == length.toLong()) FLAG_END_HEADERS else 0,
      )
      sink.writeInt(promisedStreamId and 0x7fffffff)
      sink.write(hpackBuffer, length.toLong())