But a dotenv file doesn't really have to have that exact filename.

///

Pydantic has support for reading from these types of files using an external library. You can read more at <a href="https://docs.pydantic.dev/latest/concepts/pydantic_settings/#dotenv-env-support" class="external-link" target="_blank">Pydantic Settings: Dotenv (.env) support</a>.

/// tip

For this to work, you need to `pip install python-dotenv`.

///

{* ../../docs_src/middleware/tutorial001.py hl[8:9,11,14] *}

/// tip | Примечание

Имейте в виду, что можно добавлять свои собственные заголовки <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers" class="external-link" target="_blank">при помощи префикса 'X-'</a>.

Existem diversas alternativas, incluindo:

* <a href="https://www.uvicorn.org/" class="external-link" target="_blank">Uvicorn</a>: um servidor ASGI de alta performance.
* <a href="https://hypercorn.readthedocs.io/" class="external-link" target="_blank">Hypercorn</a>: um servidor ASGI compátivel com HTTP/2, Trio e outros recursos.
* <a href="https://github.com/django/daphne" class="external-link" target="_blank">Daphne</a>: servidor ASGI construído para Django Channels.

///

## More info { #more-info }

To learn more about the options, check Starlette's documentation for:

* <a href="https://www.starlette.io/websockets/" class="external-link" target="_blank">The `WebSocket` class</a>.

{* ../../docs_src/path_params/tutorial001.py hl[6:7] *}

La valeur du paramètre `item_id` sera transmise à la fonction dans l'argument `item_id`.

Donc, si vous exécutez cet exemple et allez sur <a href="http://127.0.0.1:8000/items/foo" class="external-link" target="_blank">http://127.0.0.1:8000/items/foo</a>,

* <a href="https://github.com/swagger-api/swagger-ui" class="external-link" target="_blank"><strong>Swagger UI</strong></a>, z interaktywnym interfejsem - odpytuj i testuj swoje API bezpośrednio z przeglądarki.

![Swagger UI interakcja](https://fastapi.tiangolo.com/img/index/index-03-swagger-02.png)

* Alternatywna dokumentacja API z <a href="https://github.com/Rebilly/ReDoc" class="external-link" target="_blank"><strong>ReDoc</strong></a>.

### Sprawdź to

Otwórz w swojej przeglądarce <a href="http://127.0.0.1:8000" class="external-link" target="_blank">http://127.0.0.1:8000</a>.

Zobaczysz odpowiedź w formacie JSON:

```JSON
{"message": "Hello World"}
```

### Interaktywna dokumentacja API

Przejdź teraz do <a href="http://127.0.0.1:8000/docs" class="external-link" target="_blank">http://127.0.0.1:8000/docs</a>.

    * **Стандартизированный**: Основан на открытых стандартах API (<a href="https://github.com/OAI/OpenAPI-Specification" class="external-link" target="_blank">OpenAPI</a> и <a href="https://json-schema.org/" class="external-link" target="_blank">JSON Schema</a>) и полностью совместим с ними.

Oluşturulan şema <a href="https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.1.0.md" class="external-link" target="_blank">OpenAPI</a> standardına uygun olduğu için birçok uyumlu araç mevcuttur.

Bu sayede, **FastAPI**'ın bizzat kendisi <a href="http://127.0.0.1:8000/redoc" class="external-link" target="_blank">http://127.0.0.1:8000/redoc</a> sayfasından erişebileceğiniz alternatif (ReDoc kullanan) bir API dokümantasyonu sağlar:

З цієї причини FastAPI також надає альтернативну документацію API (використовуючи ReDoc), до якої можна отримати доступ за посиланням <a href="http://127.0.0.1:8000/redoc" class="external-link" target="_blank">http://127.0.0.1:8000/redoc</a>: