val ipv4 = InetAddress.getByName("203.0.113.1")
  val ipv6 = InetAddress.getByName("2001:db8:ffff:ffff:ffff:ffff:ffff:1")

  val refusedStream =
    MockResponse(
      socketPolicy = ResetStreamAtStart(ErrorCode.REFUSED_STREAM.httpCode),
    )
  val bodyResponse = MockResponse(body = "body")

  @BeforeEach
  fun setUp(
    server: MockWebServer,
    @MockWebServerInstance("server2") server2: MockWebServer,
  ) {

    server.enqueue(
      MockResponse(socketPolicy = ResetStreamAtStart(ErrorCode.REFUSED_STREAM.httpCode)),
    )
    server.enqueue(
      MockResponse(socketPolicy = ResetStreamAtStart(ErrorCode.REFUSED_STREAM.httpCode)),
    )
    server.enqueue(
      MockResponse(socketPolicy = ResetStreamAtStart(ErrorCode.REFUSED_STREAM.httpCode)),
    )

    val request = Request(server.url("/"))

  /** Not an error!  */
  NO_ERROR(0),

  PROTOCOL_ERROR(1),

  INTERNAL_ERROR(2),

  FLOW_CONTROL_ERROR(3),

  SETTINGS_TIMEOUT(4),

  STREAM_CLOSED(5),

  FRAME_SIZE_ERROR(6),

  REFUSED_STREAM(7),

  CANCEL(8),

  COMPRESSION_ERROR(9),

  CONNECT_ERROR(0xa),

  ENHANCE_YOUR_CALM(0xb),

  INADEQUATE_SECURITY(0xc),

  HTTP_1_1_REQUIRED(0xd),
  ;

  companion object {

    e: IOException?,
  ) {
    var noNewExchangesEvent = false
    lock.withLock {
      if (e is StreamResetException) {
        when {
          e.errorCode == ErrorCode.REFUSED_STREAM -> {
            // Stop using this connection on the 2nd REFUSED_STREAM error.
            refusedStreamCount++
            if (refusedStreamCount > 1) {
              noNewExchangesEvent = !noNewExchanges
              noNewExchanges = true

   * already had a healthy connection. It sets up a deferred connection by stalling the IPv6
   * connect, and it sets up a same-connection retry with [ErrorCode.REFUSED_STREAM].
   *
   * https://github.com/square/okhttp/pull/7190
   */
  @Test
  fun preferCallConnectionOverDeferredConnection() {
    // Make sure we have enough connection options to permit retries.

import okhttp3.internal.assertThreadDoesntHoldLock
import okhttp3.internal.closeQuietly
import okhttp3.internal.concurrent.TaskRunner
import okhttp3.internal.connection.Locks.withLock
import okhttp3.internal.http2.ErrorCode.REFUSED_STREAM
import okhttp3.internal.http2.Settings.Companion.DEFAULT_INITIAL_WINDOW_SIZE
import okhttp3.internal.http2.flowcontrol.WindowCounter
import okhttp3.internal.ignoreIoExceptions
import okhttp3.internal.okHttpName

    sink1.writeUtf8("abc")
    assertFailsWith<IOException> {
      sink2.writeUtf8("abc")
      sink2.flush()
    }.also { expected ->
      assertThat(expected.message).isEqualTo("stream was reset: REFUSED_STREAM")
    }
    sink1.writeUtf8("def")
    sink1.close()
    assertFailsWith<ConnectionShutdownException> {
      connection.newStream(headerEntries("c", "cola"), true)
    }

    }
    ```

 *  New: Upgrade to Okio 2.4.3.

    ```kotlin
    implementation("com.squareup.okio:okio:2.4.3")
    ```

 *  Fix: Limit retry attempts for HTTP/2 `REFUSED_STREAM` and `CANCEL` failures.
 *  Fix: Retry automatically when incorrectly sharing a connection among multiple hostnames. OkHttp
    shares connections when hosts share both IP addresses and certificates, such as `squareup.com`

    being updated.
 *  Fix: Make logging more consistent throughout OkHttp.
 *  Fix: Log plaintext bodies only. This uses simple heuristics to differentiate
    text from other data.
 *  Fix: Recover from `REFUSED_STREAM` errors in HTTP/2. This should improve
    interoperability with Nginx 1.10.0, which [refuses][nginx_959] streams
    created before HTTP/2 settings have been acknowledged.
 *  Fix: Improve recovery from failed routes.

	http2ErrCodeSettingsTimeout:    "SETTINGS_TIMEOUT",
	http2ErrCodeStreamClosed:       "STREAM_CLOSED",
	http2ErrCodeFrameSize:          "FRAME_SIZE_ERROR",
	http2ErrCodeRefusedStream:      "REFUSED_STREAM",
	http2ErrCodeCancel:             "CANCEL",
	http2ErrCodeCompression:        "COMPRESSION_ERROR",
	http2ErrCodeConnect:            "CONNECT_ERROR",
	http2ErrCodeEnhanceYourCalm:    "ENHANCE_YOUR_CALM",