// If the server returned an illegal server_max_window_bits, fail the web socket.
    if (serverMaxWindowBits != null && serverMaxWindowBits !in 8..15) return false

    // Success.
    return true
  }

  @Throws(IOException::class)
  internal fun checkUpgradeSuccess(
    response: Response,
    exchange: Exchange?,
  ) {
    if (response.code != 101) {

        .build()
    val log: BlockingQueue<String?> = LinkedBlockingQueue()
    enableProtocol(Protocol.HTTP_2)
    val body =
      MockStreamHandler()
        .sendResponse("success!")
        .exhaustResponse()
        .cancelStream()
    server.enqueue(
      MockResponse.Builder()
        .clearHeaders()
        .streamHandler(body)
        .build(),
    )
    val call =

    @Synchronized get() = _failedRoutes.toSet()

  /** Records a failure connecting to [failedRoute]. */
  @Synchronized fun failed(failedRoute: Route) {
    _failedRoutes.add(failedRoute)
  }

  /** Records success connecting to [route]. */
  @Synchronized fun connected(route: Route) {
    _failedRoutes.remove(route)
  }

  /** Returns true if [route] has failed recently and should be avoided. */

      null
    }
  }

  override fun trustManager(sslSocketFactory: SSLSocketFactory): X509TrustManager? {
    // Not supported due to access checks on JDK 9+:
    // java.lang.reflect.InaccessibleObjectException: Unable to make member of class
    // sun.security.ssl.SSLSocketFactoryImpl accessible:  module java.base does not export

import okhttp3.Protocol
import okhttp3.TlsVersion
import okhttp3.WebSocketListener
import okhttp3.internal.http2.Settings
import okio.Buffer
import org.junit.Ignore
import org.junit.Test

/**
 * Access every type, function, and property from Kotlin to defend against unexpected regressions in
 * modern 4.0.x kotlin source-compatibility.
 */
@Suppress(
  "ASSIGNED_BUT_NEVER_ACCESSED_VARIABLE",
  "UNUSED_ANONYMOUS_PARAMETER",

  }

  fun noNewExchangesOnConnection() {
    codec.carrier.noNewExchanges()
  }

  fun cancel() {
    codec.cancel()
  }

  /**
   * Revoke this exchange's access to streams. This is necessary when a follow-up request is
   * required but the preceding exchange hasn't completed yet.
   */
  fun detachWithViolence() {
    codec.cancel()

Code Cleanup
------------

IntelliJ and Android Studio offer a **Code Cleanup** feature that will automatically update
deprecated APIs with their replacements. Access this feature from the _Search Anywhere_ dialog
(double-press shift) or under the _Analyze_ menu.

We’ve included deprecated APIs in OkHttp 4.0 because they make migration easy. We will remove them

      Header("accept-charset", ""),
      Header("accept-encoding", "gzip, deflate"),
      Header("accept-language", ""),
      Header("accept-ranges", ""),
      Header("accept", ""),
      Header("access-control-allow-origin", ""),
      Header("age", ""),
      Header("allow", ""),
      Header("authorization", ""),
      Header("cache-control", ""),
      Header("content-disposition", ""),

To visit all headers, use the `Headers` class which supports access by index.

=== ":material-language-kotlin: Kotlin"
    ```kotlin
      private val client = OkHttpClient()

      fun run() {
        val request = Request.Builder()

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