You could also use `from starlette.requests import Request` and `from starlette.responses import JSONResponse`.

**FastAPI** provides the same `starlette.responses` as `fastapi.responses` just as a convenience for you, the developer. But most of the available responses come directly from Starlette. The same with `Request`.

///

## Override the default exception handlers { #override-the-default-exception-handlers }

/// note | Technical Details

The proxy headers are:

* [X-Forwarded-For](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/X-Forwarded-For)
* [X-Forwarded-Proto](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/X-Forwarded-Proto)
* [X-Forwarded-Host](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/X-Forwarded-Host)

///

/// note | 기술 세부사항

프록시 헤더는 다음과 같습니다:

* [X-Forwarded-For](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/X-Forwarded-For)
* [X-Forwarded-Proto](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/X-Forwarded-Proto)
* [X-Forwarded-Host](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/X-Forwarded-Host)

///

{* ../../docs_src/middleware/tutorial001_py310.py hl[8:9,11,14] *}

/// tip

Пам’ятайте, що власні пропрієтарні заголовки можна додавати [використовуючи префікс `X-`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers).

/// note | Detalles Técnicos

Los headers del proxy son:

* [X-Forwarded-For](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/X-Forwarded-For)
* [X-Forwarded-Proto](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/X-Forwarded-Proto)
* [X-Forwarded-Host](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/X-Forwarded-Host)

///

Esto es similar a [Stream JSON Lines](stream-json-lines.md), pero usa el formato `text/event-stream`, que los navegadores soportan de forma nativa con la [`EventSource` API](https://developer.mozilla.org/en-US/docs/Web/API/EventSource).

/// info | Información

Añadido en FastAPI 0.135.0.

///

## ¿Qué son los Server-Sent Events? { #what-are-server-sent-events }

This is similar to [Stream JSON Lines](stream-json-lines.md), but uses the `text/event-stream` format, which is supported natively by browsers with the [`EventSource` API](https://developer.mozilla.org/en-US/docs/Web/API/EventSource).

/// info

Added in FastAPI 0.135.0.

///

## What are Server-Sent Events? { #what-are-server-sent-events }

# WebSockets { #websockets }

Ви можете використовувати [WebSockets](https://developer.mozilla.org/en-US/docs/Web/API/WebSockets_API) з **FastAPI**.

## Встановіть `websockets` { #install-websockets }

Переконайтеся, що ви створили [віртуальне оточення](../virtual-environments.md), активували його та встановили `websockets` (бібліотеку Python, що полегшує використання протоколу «WebSocket»):

<div class="termy">

```console
$ pip install websockets

</div>

**Pydantic v2**'nin bu özelliğiyle API dokümantasyonunuz daha **hassas** olur; ayrıca autogenerated client'lar ve SDK'lar kullanıyorsanız, onlar da daha tutarlı ve daha iyi bir **developer experience** ile daha doğru üretilir. 🎉

## Schema'ları Ayırma { #do-not-separate-schemas }

Bazı durumlarda **input ve output için aynı schema'yı** kullanmak isteyebilirsiniz.

{* ../../docs_src/middleware/tutorial001_py310.py hl[8:9,11,14] *}

/// tip | Astuce

Gardez à l’esprit que des en-têtes propriétaires personnalisés peuvent être ajoutés [en utilisant le préfixe `X-`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers).