/// check | "Inspired **FastAPI** to"

Use code to define "schemas" that provide data types and validation, automatically.

///

### <a href="https://webargs.readthedocs.io/en/latest/" class="external-link" target="_blank">Webargs</a>

Another big feature required by APIs is <abbr title="reading and converting to Python data">parsing</abbr> data from incoming requests.

	// The ARN of the temporary security credentials that are returned from the
	// AssumeRole action. For more information about ARNs and how to use them in
	// policies, see IAM Identifiers (http://docs.aws.amazon.com/IAM/latest/UserGuide/reference_identifiers.html)
	// in Using IAM.
	//
	// Arn is a required field
	Arn string

	// A unique identifier that contains the role ID and the role session name of

/// info | Información

Si ya pasaste por todo el tutorial y volviste a la sección de los tipos, una buena referencia es <a href="https://mypy.readthedocs.io/en/latest/cheat_sheet_py3.html" class="external-link" target="_blank">la "cheat sheet" de `mypy`</a>.

Anwendungsserver, der den **WSGI-Standard** verwendet. Das bedeutet, dass Gunicorn Anwendungen wie Flask und Django ausliefern kann. Gunicorn selbst ist nicht mit **FastAPI** kompatibel, da FastAPI den neuesten **<a href="https://asgi.readthedocs.io/en/latest/" class="external-link" target="_blank">ASGI-Standard</a>** verwendet.

Aber Gunicorn kann als **Prozessmanager** arbeiten und Benutzer können ihm mitteilen, welche bestimmte **Workerprozessklasse** verwendet werden soll. Dann würde Gunicorn...

/// warning | "Aviso"

Você pode pular estes detalhes técnicos caso eles não sejam importantes para você neste momento.

///

`RequestValidationError` é uma subclasse do <a href="https://docs.pydantic.dev/latest/#error-handling" class="external-link" target="_blank">`ValidationError`</a> existente no Pydantic.

	requestMaxBodySize = globalMaxObjectSize + requestFormDataSize

	// Maximum size for http headers - See: https://docs.aws.amazon.com/AmazonS3/latest/dev/UsingMetadata.html
	maxHeaderSize = 8 * 1024

	// Maximum size for user-defined metadata - See: https://docs.aws.amazon.com/AmazonS3/latest/dev/UsingMetadata.html
	maxUserDataSize = 2 * 1024

	// maxBuckets upto 500000 for any MinIO deployment.
	maxBuckets = 500 * 1000
)

                            },
                            {
                              "tag": "istio.canonical_revision",
                              "literal": {
                                "value": "latest"
                              }
                            },
                            {
                              "tag": "istio.canonical_service",
                              "literal": {

👉 🍕 📶 😐, 🌅 📟 🎲 ⏪ 😰 👆:

```Python hl_lines="9-13  36-53"
{!../../docs_src/openapi_callbacks/tutorial001.py!}
```

/// tip

`callback_url` 🔢 🔢 ⚙️ Pydantic <a href="https://docs.pydantic.dev/latest/concepts/types/#urls" class="external-link" target="_blank">📛</a> 🆎.

///

🕴 🆕 👜 `callbacks=messages_callback_router.routes` ❌ *➡ 🛠️ 👨‍🎨*. 👥 🔜 👀 ⚫️❔ 👈 ⏭.

## 🔬 ⏲

☑ ⏲ 📟 🔜 🪀 🙇 🔛 👆 👍 🛠️ 📱.

Вот несколько способов, как это можно сделать.

## Pydantic `schema_extra`

Вы можете объявить ключ `example` для модели Pydantic, используя класс `Config` и переменную `schema_extra`, как описано в <a href="https://docs.pydantic.dev/latest/concepts/json_schema/#schema-customization" class="external-link" target="_blank">Pydantic документации: Настройка схемы</a>:

//// tab | Python 3.10+

```Python hl_lines="13-21"

## Technische Details

Nur ein technisches Detail für die neugierigen Nerds. 🤓

In der technischen ASGI-Spezifikation ist dies Teil des <a href="https://asgi.readthedocs.io/en/latest/specs/lifespan.html" class="external-link" target="_blank">Lifespan Protokolls</a> und definiert Events namens `startup` und `shutdown`.

/// info