var pos = 0
    val limit = string.length
    val result = Buffer()

    while (pos < limit) {
      var dot = string.indexOf('.', startIndex = pos)
      if (dot == -1) dot = limit

      if (!encodeLabel(string, pos, dot, result)) {
        // If we couldn't encode the label, give up.
        return null
      }

      if (dot < limit) {
        result.writeByte('.'.code)

internal fun decodeIpv6(
  input: String,
  pos: Int,
  limit: Int,
): ByteArray? {
  val address = ByteArray(16)
  var b = 0
  var compress = -1
  var groupOffset = -1

  var i = pos
  while (i < limit) {
    if (b == address.size) return null // Too many groups.

    // Read a delimiter.
    if (i + 2 <= limit && input.startsWith("::", startIndex = i)) {

    url: HttpUrl,
    header: String,
  ): List<Cookie> {
    val result = mutableListOf<Cookie>()
    var pos = 0
    val limit = header.length
    var pairEnd: Int
    while (pos < limit) {
      pairEnd = header.delimiterOffset(";,", pos, limit)
      val equalsSign = header.delimiterOffset('=', pos, pairEnd)
      val name = header.trimSubstring(pos, equalsSign)
      if (name.startsWith("$")) {

   * connection to an address fails, OkHttp will retry the connection with the next address until
   * either a connection is made, the set of IP addresses is exhausted, or a limit is exceeded.
   */
  @Throws(UnknownHostException::class)
  fun lookup(hostname: String): List<InetAddress>

  companion object {
    /**

 * or both.
 *
 * ## Authentication Retries
 *
 * If your authentication may be flaky and requires retries you should apply some policy
 * to limit the retries by the class of errors and number of attempts.  To get the number of
 * attempts to the current point use this function.
 *
 * ```java
 * private int responseCount(Response response) {
 *   int result = 1;

    calls and that can receive data faster than they can process it. Previously, OkHttp limited
    HTTP/2 to 16 MiB of unacknowledged data per connection. With this fix there is a limit of 16 MiB
    of unacknowledged data per stream and no per-connection limit.

 *  Fix: Don't operate on a connection after it's been returned to the pool. This race occurred
    on failed web socket connection attempts.

 *  Upgrade: [Okio 3.6.0][okio_3_6_0].

0002 0.554 responseBodyEnd
0002 0.554 connectionReleased
0002 0.554 callEnd
0001 0.624 responseBodyEnd
0001 0.624 connectionReleased
0001 0.624 callEnd
```

The `EventListener.Factory` also makes it possible to limit metrics to a subset of calls. This one captures metrics on a random 10%:

```java
class MetricsEventListener extends EventListener {
  private static final Factory FACTORY = new Factory() {

    }.also { expected ->
      assertThat(expected.message).isEqualTo("enclosed object too large")
    }
  }

  /** Object identifiers are nominally self-delimiting. Outrun the limit with one. */
  @Test fun `variable length long outruns limit`() {
    val bytes = "060229ffffff7f".decodeHex()
    assertFailsWith<ProtocolException> {
      Adapters.OBJECT_IDENTIFIER.fromDer(bytes)
    }.also { expected ->

  @Throws(IOException::class)
  override fun onStream(stream: Http2Stream) {
    stream.close(ErrorCode.REFUSED_STREAM, null)
  }

  /** When settings are received, adjust the allocation limit. */
  override fun onSettings(
    connection: Http2Connection,
    settings: Settings,
  ) {
    lock.withLock {
      val oldLimit = allocationLimit
      allocationLimit = settings.getMaxConcurrentStreams()

    gzipSink.close()
    return result
  }

  private fun assertContent(
    expected: String,
    response: Response,
    limit: Int = Int.MAX_VALUE,
  ) {
    assertThat(readAscii(response.body.byteStream(), limit)).isEqualTo(expected)
  }

  private fun newSet(vararg elements: String): Set<String> {
    return setOf(*elements)
  }