territories","gabon","gambia","georgia","germany","ghana","gibraltar","greece","greenland","grenada","guadeloupe","guam","guatemala","guernsey","guinea","guinea-bissau","guyana","haiti","heard island and mcdonald islands","honduras","hong kong","hungary","iceland","india","indonesia","iran","iraq","ireland","isle of man","israel","italy","jamaica","japan","jersey","jordan","kazakhstan","kenya","kiribati","north korea","south korea","kuwait","kyrgyzstan","laos","latvia","lebanon","lesotho","liberia","libya","liecht...

* `allow_credentials` - Indica que os cookies devem ser suportados para requisições de origem cruzada. O padrão é `False`.

* `allow_credentials` - Indica que las cookies deberían estar soportadas para requests cross-origin. Por defecto es `False`.

Por ejemplo, si el cliente intenta enviar un parámetro query `tool` con un valor de `plumbus`, como:

```http
https://example.com/items/?limit=10&tool=plumbus
```

Recibirán un response de **error** que les indica que el parámetro query `tool` no está permitido:

```json
{
    "detail": [
        {
            "type": "extra_forbidden",
            "loc": ["query", "tool"],

/// check | Revisa

Entonces, con la misma declaración de tipo de Python, **FastAPI** te ofrece validación de datos.

Nota que el error también indica claramente el punto exacto donde la validación falló.

Esto es increíblemente útil mientras desarrollas y depuras código que interactúa con tu API.

///

## Documentación { #documentation }

available from the plug-in's github repository. Your use of the ASM code is subject to the terms and conditions of the ASM License below which is also available at http://asm.ow2.org/license.html http://asm.ow2.org/license.html. Copyright (c) 2000-2011 INRIA, France Telecom All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice,...

Bu noktada, yukarıda oluşturduğunuz callback router'ında gerekli callback *path operation*'ları (external geliştiricinin *external API*'de implemente etmesi gerekenler) hazır.

Şimdi sizin API'nizin *path operation decorator*'ında `callbacks` parametresini kullanarak, callback router'ının `.routes` attribute'unu (bu aslında route/*path operation*'lardan oluşan bir `list`) geçin:

{* ../../docs_src/openapi_callbacks/tutorial001_py310.py hl[33] *}