In that case, **FastAPI** also provides you with the tools to build it.

///

When we create an instance of the `OAuth2PasswordBearer` class we pass in the `tokenUrl` parameter. This parameter contains the URL that the client (the frontend running in the user's browser) will use to send the `username` and `password` in order to get a token.

//// tab | Python 3.9+

```Python hl_lines="8"

 *
 * The query is optional: it can be null, empty, or non-empty. For many HTTP URLs the query string
 * is subdivided into a collection of name-value parameters. This class offers methods to set the
 * query as the single string, or as individual name-value parameters. With name-value parameters
 * the values are optional and names may be repeated.
 *
 * ### Fragment
 *

///

## Combining information

You can also combine response information from multiple places, including the `response_model`, `status_code`, and `responses` parameters.

You can declare a `response_model`, using the default status code `200` (or a custom one if you need), and then declare additional information for that same response in `responses`, directly in the OpenAPI schema.

* Die Variable `items_s` ist ein `set`, und jedes seiner Elemente ist vom Typ `bytes`.

#### Dict

Um ein `dict` zu definieren, übergeben Sie zwei Typ-Parameter, getrennt durch Kommas.

Der erste Typ-Parameter ist für die Schlüssel des `dict`.

Der zweite Typ-Parameter ist für die Werte des `dict`:

//// tab | Python 3.9+

```Python hl_lines="1"
{!> ../../docs_src/python_types/tutorial008_py39.py!}
```

     * parameter type matches boolean primitive formal type). This behavior
     * is because this method is used to determine applicable methods for
     * an actual parameter list, and primitive types are represented by
     * their object duals in reflective method calls.
     *
     * @param formal the formal parameter type to which the actual

 *      </td>
 *   </tr>
 *   <tr>
 *      <td>parameters</td>
 *      <td>N/A</td>
 *      <td>No</td>
 *      <td>Specifications for the parameters which this Mojo uses will be provided in <b>parameter</b> sub-elements
 *          in this section.
 *          <br>
 *          <i>NOTE: Parameters are discussed in more detail below.</i>
 *      </td>
 *   </tr>
 * </table>

   * that conversion is safe.
   *
   * <p>This method is intended to help with usages of type parameters that have {@linkplain
   * ParametricNullness parametric nullness}. If a type parameter instead ranges over only non-null
   * types (or if the type is a non-variable type, like {@code String}), then code should almost

   * that conversion is safe.
   *
   * <p>This method is intended to help with usages of type parameters that have {@linkplain
   * ParametricNullness parametric nullness}. If a type parameter instead ranges over only non-null
   * types (or if the type is a non-variable type, like {@code String}), then code should almost

 * <td colspan="3">
 * <b>Examples Of SMB URLs When Augmented With A Second Constructor Parameter</b></td>
 * <tr><td width="20%">
 * <b>First Parameter</b></td><td><b>Second Parameter</b></td><td><b>Result</b></td></tr>
 *
 * <tr><td width="20%"><code>
 *  smb1://host/share/a/b/
 * </code></td><td width="20%"><code>
 *  c/d/
 * </code></td><td><code>
 *  smb1://host/share/a/b/c/d/
 * </code></td></tr>
 * 

## Alternative Events (deprecated)

/// warning | "Achtung"

Der empfohlene Weg, das *Hochfahren* und *Herunterfahren* zu handhaben, ist die Verwendung des `lifespan`-Parameters der `FastAPI`-App, wie oben beschrieben. Wenn Sie einen `lifespan`-Parameter übergeben, werden die `startup`- und `shutdown`-Eventhandler nicht mehr aufgerufen. Es ist entweder alles `lifespan` oder alles Events, nicht beides.

Sie können diesen Teil wahrscheinlich überspringen.