* by applying the given {@code AsyncFunction} to the result of the original {@code Future}.
   * Example usage:
   *
   * {@snippet :
   * FluentFuture<RowKey> rowKeyFuture = FluentFuture.from(indexService.lookUp(query));
   * ListenableFuture<QueryResult> queryFuture =
   *     rowKeyFuture.transformAsync(dataService::readFuture, executor);
   * }
   *

		}
	}

	// Parse date header.
	var err error
	date, err = time.Parse(iso8601Format, dateStr)
	if err != nil {
		return cred, "", "", time.Time{}, ErrMalformedDate
	}

	// Query string.
	queryStr := req.Form.Encode()

	// Get canonical request.
	canonicalRequest := getCanonicalRequest(extractedSignedHeaders, payload, queryStr, req.URL.Path, req.Method)

    // Try the same server first
    InetAddress serverAddress = transport.getRemoteAddress();
    
    if (isWitnessServiceAvailable(serverAddress)) {
        return serverAddress;
    }
    
    // Query for cluster witness service via DNS
    try {
        String clusterName = getClusterName(serverAddress);
        if (clusterName != null) {
            return InetAddress.getByName(clusterName + "-witness");
        }

* **Sự hỗ trợ từ các trình soạn thảo**.
* **Kiểm tra kiểu dữ liệu (type checking)**.

...và **FastAPI** sử dụng các khia báo để:

* **Định nghĩa các yêu cầu**: từ tham số đường dẫn của request, tham số query, headers, bodies, các phụ thuộc (dependencies),...
* **Chuyển dổi dữ liệu*: từ request sang kiểu dữ liệu được yêu cầu.
* **Kiểm tra tính đúng đắn của dữ liệu**: tới từ mỗi request:

labels.lastAccessTime=最終アクセス日時
labels.notificationTo=通知先
labels.num=数
labels.pn=ページ番号
labels.protocolScheme=スキーム
labels.purgeByBots=Botsの削除
labels.logLevel=ログレベル
labels.purgeSearchLogDay=検索ログの削除
labels.query=クエリー
labels.queryId=クエリーID
labels.rt=rt
labels.searchLog=検索ログ
labels.sort=ソート
labels.start=スタート位置
labels.loginRequired=ログインが必要
labels.loginLink=ログインリンク表示
labels.threadName=スレッド名
labels.url=URL

	public final fun password ()Ljava/lang/String;
	public final fun pathSegments ()Ljava/util/List;
	public final fun pathSize ()I
	public final fun port ()I
	public final fun query ()Ljava/lang/String;
	public final fun queryParameter (Ljava/lang/String;)Ljava/lang/String;
	public final fun queryParameterName (I)Ljava/lang/String;
	public final fun queryParameterNames ()Ljava/util/Set;

* **Editor ondersteuning**.
* **Type checks**.

...en **FastAPI** gebruikt dezelfde declaraties om:

* **Vereisten te definïeren **: van request pad parameters, query parameters, headers, bodies, dependencies, enz.
* **Data te converteren**: van de request naar het vereiste type.
* **Data te valideren**: afkomstig van elke request:

labels.lastAccessTime=上次訪問時間
labels.notificationTo=通知對象
labels.num=數量
labels.pn=頁碼
labels.protocolScheme=方案
labels.purgeByBots=按機器人清除
labels.logLevel=日誌級別
labels.purgeSearchLogDay=刪除搜尋日誌
labels.query=查詢
labels.queryId=查詢ID
labels.rt=rt
labels.searchLog=搜尋日誌
labels.sort=排序
labels.start=開始位置
labels.loginRequired=需要登入
labels.loginLink=顯示登入連結
labels.threadName=執行緒名稱
labels.url=URL
labels.userFavorite=收藏日誌

   */
  Collection<V> createCollection(@ParametricNullness K key) {
    return createCollection();
  }

  Map<K, Collection<V>> backingMap() {
    return map;
  }

  // Query Operations

  @Override
  public int size() {
    return totalSize;
  }

  @Override
  public boolean containsKey(@Nullable Object key) {
    return map.containsKey(key);
  }

   */
  public CharMatcher or(CharMatcher other) {
    return new Or(this, other);
  }

  /**
   * Returns a {@code char} matcher functionally equivalent to this one, but which may be faster to
   * query than the original; your mileage may vary. Precomputation takes time and requires more
   * memory, so it is only likely to be worthwhile if the precomputed matcher is queried very often.
   *