Create a `timedelta` with the expiration time of the token.

Create a real JWT access token and return it.

{* ../../docs_src/security/tutorial004_an_py310.py hl[118:133] *}

### Technical details about the JWT "subject" `sub` { #technical-details-about-the-jwt-subject-sub }

The JWT specification says that there's a key `sub`, with the subject of the token.

#### `lru_cache` Technical Details { #lru-cache-technical-details }

`@lru_cache` modifies the function it decorates to return the same value that was returned the first time, instead of computing it again, executing the code of the function every time.

В любом из случаев выше FastAPI всё равно работает асинхронно и очень быстро.

Но следуя этим шагам, он сможет выполнить некоторые оптимизации производительности.

## Технические подробности { #technical-details }

Современные версии Python поддерживают **«асинхронный код»** с помощью **«сопрограмм»** (coroutines) и синтаксиса **`async` и `await`**.

Разберём эту фразу по частям в разделах ниже:

* **Асинхронный код**

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discrimination based on any of the protected characteristics above, including participants with
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Reporting Issues
----------------

Und dann schreibt ein weiterer Hintergrundtask, der in der *Pfadoperation-Funktion* erstellt wird, eine Nachricht unter Verwendung des Pfad-Parameters `email`.

## Technische Details { #technical-details }

Die Klasse `BackgroundTasks` stammt direkt von <a href="https://www.starlette.dev/background/" class="external-link" target="_blank">`starlette.background`</a>.

import org.codehaus.plexus.classworlds.realm.ClassRealm;

/**
 * Caches extension class realms. <strong>Warning:</strong> This is an internal utility interface that is only public
 * for technical reasons, it is not part of the public API. In particular, this interface can be changed or deleted
 * without prior notice.
 *
 */
public interface ExtensionRealmCache {
    /**
     * A cache key.
     */

import org.apache.maven.execution.MavenSession;
import org.apache.maven.plugin.MojoExecution;

/**
 * Assists in firing execution events. <strong>Warning:</strong> This is an internal utility class that is only public
 * for technical reasons, it is not part of the public API. In particular, this class can be changed or deleted without
 * prior notice.
 *
 */
@Named
@Singleton

You can then use `Field` with model attributes:

{* ../../docs_src/body_fields/tutorial001_an_py310.py hl[11:14] *}

`Field` works the same way as `Query`, `Path` and `Body`, it has all the same parameters, etc.

/// note | Technical Details

Actually, `Query`, `Path` and others you'll see next create objects of subclasses of a common `Param` class, which is itself a subclass of Pydantic's `FieldInfo` class.

You can read more details about the <a href="https://www.starlette.dev/requests/" class="external-link" target="_blank">`Request` object in the official Starlette documentation site</a>.

/// note | Technical Details

You could also use `from starlette.requests import Request`.

**FastAPI** provides it directly just as a convenience for you, the developer. But it comes directly from Starlette.

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Assists the project builder. <strong>Warning:</strong> This is an internal utility class that is only public for
 * technical reasons, it is not part of the public API. In particular, this class can be changed or deleted without
 * prior notice.
 *
 */
@Named
@Singleton