Это не является ограничением **FastAPI**, это часть протокола HTTP.

///

## Необязательная загрузка файлов { #optional-file-upload }

Вы можете сделать загрузку файла необязательной, используя стандартные аннотации типов и установив значение по умолчанию `None`:

{* ../../docs_src/request_files/tutorial001_02_an_py310.py hl[9,17] *}

 * existing key-value pair has no effect.
 *
 * <p>Null keys and values are permitted (provided, of course, that the respective comparators
 * support them). All optional multimap methods are supported, and all returned views are
 * modifiable.
 *
 * <p>This class is not threadsafe when any concurrent operations update the multimap. Concurrent

{* ../../docs_src/body_multiple_params/tutorial001_an_py310.py hl[18:20] *}

/// note | Nota

Repare que, neste caso, o `item` que seria capturado a partir do corpo é opcional. Visto que ele possui `None` como valor padrão.

///

## Múltiplos parâmetros de corpo { #multiple-body-parameters }

{* ../../docs_src/body_multiple_params/tutorial001_an_py310.py hl[18:20] *}

/// note

Notez que, dans ce cas, le paramètre `item` provenant du `Body` est optionnel (sa valeur par défaut est `None`).

///

## Paramètres multiples du body

Dans l'exemple précédent, les opérations de routage attendaient un body JSON avec les attributs d'un `Item`, par exemple :

```JSON
{

		}
	}

	return nil
}

//   # snowball based archive transfer is by default enabled when source
//   # is local and target is remote which is also minio.
//   snowball:
//     disable: false # optionally turn-off snowball archive transfer
//     batch: 100 # upto this many objects per archive
//     inmemory: true # indicates if the archive must be staged locally or in-memory
//     compress: true # S2/Snappy compressed archive

			}
		} // regular object/metadata replication
		return rule.MetadataReplicate(obj)
	}
	return false
}

// HasActiveRules - returns whether replication policy has active rules
// Optionally a prefix can be supplied.
// If recursive is specified the function will also return true if any level below the
// prefix has active rules. If no prefix is specified recursive is effectively true.

                    Artifact artifact = node.getArtifact();

                    try {
                        if (node.filterTrail(filter)) {
                            // If it was optional and not a direct dependency,
                            // we don't add it or its children, just allow the update of the version and artifactScope
                            if (node.isChildOfRootNode() || !artifact.isOptional()) {

import com.ibm.icu.text.Transliterator;

/**
 * {@link KatakanaConverter} converts input strings to katakana representation.
 * It utilizes a transliterator to convert hiragana to katakana and can optionally
 * use a tokenizer to process the input.
 *
 * <p>
 * The class provides methods to initialize the converter, convert strings, and
 * check if a tokenizer is enabled. It also includes methods to create a token

///

Und wenn Sie darauf klicken, erhalten Sie ein kleines Anmeldeformular zur Eingabe eines `username` und `password` (und anderer optionaler Felder):

<img src="/img/tutorial/security/image02.png">

/// note | Hinweis

Es spielt keine Rolle, was Sie in das Formular eingeben, es wird noch nicht funktionieren. Wir kommen dahin.

///

import org.dbflute.cbean.ConditionBean;
import org.dbflute.cbean.result.ListResultBean;
import org.dbflute.cbean.result.PagingResultBean;
import org.dbflute.exception.IllegalBehaviorStateException;
import org.dbflute.optional.OptionalEntity;
import org.dbflute.util.DfTypeUtil;
import org.opensearch.action.bulk.BulkRequestBuilder;
import org.opensearch.action.delete.DeleteRequestBuilder;
import org.opensearch.action.index.IndexRequestBuilder;