* Bekommen Sie mit, wenn ich Ankündigungen mache oder neue Tools veröffentliche.
    * Sie können auch <a href="https://twitter.com/fastapi" class="external-link" target="_blank">@fastapi auf Twitter folgen</a> (ein separates Konto).
* <a href="https://www.linkedin.com/in/tiangolo/" class="external-link" target="_blank">Folgen Sie mir auf **LinkedIn**</a>.

  /**
   * Closes the cache and deletes all of its stored values. This will delete all files in the cache
   * directory including files that weren't created by the cache.
   */
  @Throws(IOException::class)
  fun delete() {
    cache.delete()
  }

  /**
   * Deletes all values stored in the cache. In-flight writes to the cache will complete normally,
   * but the corresponding responses will not be stored.
   */

/// tip | "Tipp"

Bedenken Sie außerdem, dass Sie, abhängig von Ihrer Einrichtung, in manchen Fällen **gar keine Vorab-Schritte** benötigen, bevor Sie die Anwendung starten.

In diesem Fall müssen Sie sich darüber keine Sorgen machen. 🤷

///

### Beispiele für Strategien für Vorab-Schritte

// dataUsageCacheV2 contains a cache of data usage entries version 2.
type dataUsageCacheV2 struct {
	Info  dataUsageCacheInfo
	Cache map[string]dataUsageEntryV2
}

// dataUsageCacheV3 contains a cache of data usage entries version 3.
type dataUsageCacheV3 struct {
	Info  dataUsageCacheInfo
	Cache map[string]dataUsageEntryV3
}

// dataUsageCacheV4 contains a cache of data usage entries version 4.

    * Autocompletamento.
    * Controllo sulle annotazioni di tipo.
* Validazione dei dati:
    * Errori chiari e automatici quando i dati sono invalidi.
    * Validazione anche per gli oggetti JSON più complessi.
* <abbr title="anche noto come: serializzazione, parsing, marshalling">Conversione</abbr> dei dati di input: da risorse esterne a dati e tipi di Python. È possibile leggere da:
    * JSON.
    * Path parameters.

	// -t mangle -A PREROUTING -j ISTIO_PRERT
	iptablesBuilder.AppendRule(
		iptableslog.UndefinedCommand, iptablesconstants.PREROUTING, iptablesconstants.MANGLE,
		"-j", ChainInpodPrerouting,
	)

	// -t mangle -A OUTPUT -p tcp -j ISTIO_OUTPUT
	iptablesBuilder.AppendRule(
		iptableslog.UndefinedCommand, iptablesconstants.OUTPUT, iptablesconstants.MANGLE,
		"-j", ChainInpodOutput,
	)

```
api                   manage global HTTP API call specific features, such as throttling, authentication types, etc.
heal                  manage object healing frequency and bitrot verification checks
scanner               manage namespace scanning for usage calculation, lifecycle, healing and more
```

			Key:         config.APISubSys,
			Description: "manage global HTTP API call specific features, such as throttling, authentication types, etc.",
		},
		config.HelpKV{
			Key:         config.ScannerSubSys,
			Description: "manage namespace scanning for usage calculation, lifecycle, healing and more",
		},
		config.HelpKV{
			Key:         config.BatchSubSys,
			Description: "manage batch job workers and wait times",
		},

  // matches only a single label. You cannot have a wildcard label by itself (e.g. Host == "*").
  // Requests will be matched against the Host field in the following way:
  // 1. If host is precise, the request matches this rule if the http host header is equal to Host.
  // 2. If host is a wildcard, then the request matches this rule if the http host header

///

```Python hl_lines="1"
{!> ../../docs_src/request_files/tutorial001.py!}
```

////

## `File`-Parameter definieren

Erstellen Sie Datei-Parameter, so wie Sie es auch mit `Body` und `Form` machen würden:

//// tab | Python 3.9+

```Python hl_lines="9"
{!> ../../docs_src/request_files/tutorial001_an_py39.py!}
```

////

//// tab | Python 3.8+

```Python hl_lines="8"