/// info | Detalles técnicos

**FastAPI** sabrá que puede usar la clase `OAuth2PasswordBearer` (declarada en una dependencia) para definir el esquema de seguridad en OpenAPI porque hereda de `fastapi.security.oauth2.OAuth2`, que a su vez hereda de `fastapi.security.base.SecurityBase`.

```python
def say_hi(name: str | None):
    print(f"Hey {name}!")
```

Daz DeBoer <******@****.***> <******@****.***>
Daz DeBoer <******@****.***> <******@****.***>
Daz DeBoer <******@****.***> <******@****.***>
Daz DeBoer <******@****.***> <******@****.***>
Derek Eskens <******@****.***> <******@****.***>
Etienne Studer <******@****.***> <******@****.***>
Etienne Studer <******@****.***> <******@****.***>

{* ../../docs_src/cookie_params/tutorial001_an_py310.py hl[9] *}

/// note | Detalles Técnicos

`Cookie` es una clase "hermana" de `Path` y `Query`. También hereda de la misma clase común `Param`.

Pero recuerda que cuando importas `Query`, `Path`, `Cookie` y otros desde `fastapi`, en realidad son funciones que devuelven clases especiales.

///

/// info | Información

  * Un parámetro de query.
  * Un header.
  * Una cookie.
* `http`: sistemas de autenticación HTTP estándar, incluyendo:
  * `bearer`: un header `Authorization` con un valor de `Bearer ` más un token. Esto se hereda de OAuth2.
  * Autenticación básica HTTP.
  * Digest HTTP, etc.
* `oauth2`: todas las formas de OAuth2 para manejar la seguridad (llamadas "flujos").

</div>

Bu, alanın **her zaman bir değeri olacağı** anlamına gelir; sadece bazen bu değer `None` olabilir (JSON'da `null`).

Dolayısıyla API'nizi kullanan client'ların bu değerin var olup olmadığını kontrol etmesine gerek yoktur; **alanın her zaman mevcut olacağını varsayabilirler**, sadece bazı durumlarda default değer olan `None` gelecektir.

Bunu OpenAPI'de ifade etmenin yolu, bu alanı **required** olarak işaretlemektir; çünkü her zaman yer alacaktır.

  /**
   * Flush a {@link Flushable}, with control over whether an {@code IOException} may be thrown.
   *
   * <p>If {@code swallowIOException} is true, then we don't rethrow {@code IOException}, but merely
   * log it.
   *
   * @param flushable the {@code Flushable} object to be flushed.
   * @param swallowIOException if true, don't propagate IO exceptions thrown by the {@code flush}
   *     method

     * {@code <groupId>:<artifactId>:<version>} but some of these coordinates may still be unknown at the point the
     * exception is thrown so this information is merely meant to assist the user.
     *
     * @return The identifier of the POM or an empty string if not known, never {@code null}.
     */
    public String getModelId() {
        if (result == null) {
            return "";

Sie können auch den Dateipfad an den Befehl `fastapi dev` übergeben, dann wird das zu verwendende FastAPI-App-Objekt erraten:

```console
$ fastapi dev main.py
```

Aber Sie müssten sich merken, bei jedem Aufruf des `fastapi`-Befehls den korrekten Pfad zu übergeben.

        V42
    }

    /**
     * Gets the identifier of the model from which the problem originated. The identifier is derived from the
     * information that is available at the point the problem occurs and as such merely serves as best effort
     * to provide information to the user to track the problem back to its origin.
     *
     * @return The identifier of the model from which the problem originated or an empty string if unknown, never