}

@Override
protected void doConnect() throws IOException {
    // Request directory lease for directories
    if (isDirectory()) {
        requestDirectoryLease();
    }
    
    // Continue with normal connection logic
    super.doConnect();
}

@Override
public void close() throws IOException {
    try {
        super.close();
    } finally {

      this.timeouts = ImmutableList.copyOf(timeouts);
    }
  }

  /** Possible outcomes of calling any of the methods under test. */
  private enum Outcome {

    /** The method returned normally and is either void or returned true. */
    SUCCESS,

    /** The method returned false. */
    FAILURE,

    /** The method threw an InterruptedException. */
    INTERRUPT,

     */
    boolean isAllowCompound(String command);

    /**
     * Machine identifier
     *
     * ClientGuid, ... are derived from this value.
     *
     * Normally this should be randomly assigned for each client instance/configuration.
     *
     * @return machine identifier (32 byte)
     */
    byte[] getMachineId();

    /**
     *
     *

## Version 4.2.2

_2019-10-06_

 *  Fix: When closing a canceled HTTP/2 stream, don't send the `END_STREAM` flag. This could cause
    the server to incorrectly interpret the stream as having completed normally. This is most useful
    when a request body needs to cancel its own call.


## Version 4.2.1

_2019-10-02_

 *  Fix: In 4.1.0 we introduced a performance regression that prevented connections from being

    public static final int ACB_PWNOTREQ = 4;
    /** Account control bit flag: Temporary duplicate account */
    public static final int ACB_TEMPDUP = 8;
    /** Account control bit flag: Normal user account */
    public static final int ACB_NORMAL = 16;
    /** Account control bit flag: MNS logon user account */
    public static final int ACB_MNS = 32;
    /** Account control bit flag: Interdomain trust account */

    public static final int ACB_PWNOTREQ = 4;
    /** Account control bit flag: Temporary duplicate account */
    public static final int ACB_TEMPDUP = 8;
    /** Account control bit flag: Normal user account */
    public static final int ACB_NORMAL = 16;
    /** Account control bit flag: MNS logon user account */
    public static final int ACB_MNS = 32;
    /** Account control bit flag: Interdomain trust account */

その後、あなたの API は（仮にこうしましょう）:

* 外部開発者の顧客に請求書を送ります。
* 代金を回収します。
* API 利用者（外部開発者）に通知を送り返します。
    * これは（あなたの API から）外部開発者が提供する *外部 API* に POST リクエストを送ることで行われます（これが「コールバック」です）。

## 通常の FastAPI アプリ { #the-normal-fastapi-app }

まず、コールバックを追加する前の通常の API アプリがどうなるか見てみましょう。

`Invoice` ボディを受け取り、クエリパラメータ `callback_url` にコールバック用の URL を含める *path operation* を持ちます。

この部分はとても普通で、ほとんどのコードはすでに見覚えがあるはずです:

  fun nextFrame(
    requireSettings: Boolean,
    handler: Handler,
  ): Boolean {
    try {
      source.require(9) // Frame header size.
    } catch (e: EOFException) {
      return false // This might be a normal socket close.
    }

    //  0                   1                   2                   3
    //  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

  /**
   * Returns the stack trace of {@code throwable}, possibly providing slower iteration over the full
   * trace but faster iteration over parts of the trace. Here, "slower" and "faster" are defined in
   * comparison to the normal way to access the stack trace, {@link Throwable#getStackTrace()
   * throwable.getStackTrace()}. Note, however, that this method's special implementation is not

  }

  /**
   * An instance created in {@link #readObject} to be returned from {@link #readResolve}. This field
   * is used only by those methods, and it is never set in a "normal" instance.
   *
   * <p>For more background, see {@code ConcurrentHashMultiset.deserializationReplacement}.
   */
  private transient @Nullable ImmutableListMultimap<?, ?> deserializationReplacement;