val extensions = WebSocketExtensions.parse(response.headers)
          this@RealWebSocket.extensions = extensions
          if (!extensions.isValid()) {
            synchronized(this@RealWebSocket) {
              messageAndCloseQueue.clear() // Don't transmit any messages.
              close(1010, "unexpected Sec-WebSocket-Extensions in response header")

    assertThat(client.canceled).isFalse()

    taskFaker.advanceUntil(ns(RealWebSocket.CANCEL_AFTER_CLOSE_MILLIS - 1))
    assertThat(client.canceled).isFalse()

    taskFaker.advanceUntil(ns(RealWebSocket.CANCEL_AFTER_CLOSE_MILLIS))
    assertThat(client.canceled).isTrue()

    client.processNextFrame() // This won't get a frame, but it will get a closed pipe.

import okhttp3.internal.http2.Http2Stream
import okhttp3.internal.immutableListOf
import okhttp3.internal.platform.Platform
import okhttp3.internal.threadFactory
import okhttp3.internal.toImmutableList
import okhttp3.internal.ws.RealWebSocket
import okhttp3.internal.ws.WebSocketExtensions
import okhttp3.internal.ws.WebSocketProtocol
import okio.Buffer
import okio.BufferedSink
import okio.BufferedSource
import okio.ByteString
import okio.Sink