* @param errorCode reason for closing the connection.
   * @param debugData only valid for HTTP/2; opaque debug data to send.
   */
  @Throws(IOException::class)
  fun goAway(
    lastGoodStreamId: Int,
    errorCode: ErrorCode,
    debugData: ByteArray,
  ) {
    this.withLock {
      if (closed) throw IOException("closed")

        lastGoodStreamId = this.lastGoodStreamId
      }
      // TODO: propagate exception message into debugData.
      // TODO: configure a timeout on the reader so that it doesn’t block forever.
      writer.goAway(lastGoodStreamId, statusCode, EMPTY_BYTE_ARRAY)
    }
  }

  /**
   * Closes this connection. This cancels all open streams and unanswered pings. It closes the

    }
  }

  /**
   * This simulates a race condition where we receive a healthy HTTP/2 connection and just prior to
   * writing our request, we get a GOAWAY frame from the server.
   */
  @ParameterizedTest
  @ArgumentsSource(ProtocolParamProvider::class)
  fun connectionShutdownAfterHealthCheck(
    protocol: Protocol,
    mockWebServer: MockWebServer,

- Apiserver add a new flag --goaway-chance which is the fraction of requests that will be closed gracefully(GOAWAY) to prevent HTTP/2 clients from getting stuck on a single apiserver. 
  After the connection closed(received GOAWAY), the client's other in-flight requests won't be affected, and the client will reconnect. 

      ),
    )
    server.enqueue(
      MockResponse(body = "def"),
    )

    // Send a separate request which will trigger a GOAWAY frame on the healthy connection.
    val response = getResponse(newRequest("/"))
    assertContent("abc", response)

    // Ensure the GOAWAY frame has time to be read and processed.
    Thread.sleep(500)
    assertContent(
      "def",
      getResponse(
        Request(

 *  New: Support the `immutable` cache-control directive.
 *  Fix: Don't crash when an HTTP/2 call is redirected while the connection is
    being shut down.
 *  Fix: Don't drop headers of healthy streams that raced with `GOAWAY` frames.
    This bug would cause HTTP/2 streams to occasional hang when the connection
    was shutting down.
 *  Fix: Honor `OkHttpClient.retryOnConnectionFailure()` when the response is a

HSPLokhttp3/internal/http2/Http2Writer;->data(ZILokio/Buffer;I)V
HSPLokhttp3/internal/http2/Http2Writer;->flush()V
HSPLokhttp3/internal/http2/Http2Writer;->frameHeader(IIII)V
HSPLokhttp3/internal/http2/Http2Writer;->goAway(ILokhttp3/internal/http2/ErrorCode;[B)V
HSPLokhttp3/internal/http2/Http2Writer;->headers(ZILjava/util/List;)V
HSPLokhttp3/internal/http2/Http2Writer;->windowUpdate(IJ)V
HSPLokhttp3/internal/http2/Huffman$Node;-><init>()V

- Apiserver add a new flag --goaway-chance which is the fraction of requests that will be closed gracefully(GOAWAY) to prevent HTTP/2 clients from getting stuck on a single apiserver. 
  After the connection closed(received GOAWAY), the client's other in-flight requests won't be affected, and the client will reconnect. 

- Clients required to use go1.15.8+ or go1.16+ if kube-apiserver has the goaway feature enabled to avoid unexpected data race condition. ([#98809](https://github.com/kubernetes/kubernetes/pull/98809), [@answer1991](https://github.com/answer1991))