from typing import AsyncGenerator, ContextManager, TypeVar

import anyio
from anyio import CapacityLimiter
from starlette.concurrency import iterate_in_threadpool as iterate_in_threadpool  # noqa
from starlette.concurrency import run_in_threadpool as run_in_threadpool  # noqa
from starlette.concurrency import (  # noqa
    run_until_first_complete as run_until_first_complete,
)

_T = TypeVar("_T")

# WebSockets

When defining WebSockets, you normally declare a parameter of type `WebSocket` and with it you can read data from the client and send data to it.

It is provided directly by Starlette, but you can import it from `fastapi`:

```python
from fastapi import WebSocket
```

/// tip

def test_get_starlette_item():
    response = client.get("/starlette-items/foo")
    assert response.status_code == 200, response.text
    assert response.json() == {"item": "The Foo Wrestlers"}


def test_get_starlette_item_not_found():
    response = client.get("/starlette-items/bar")
    assert response.status_code == 404, response.text
    assert response.headers.get("x-error") is None

```

/// note | "Technical Details"

You could also use `from starlette.responses import Response` or `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.

    with_info_plain_validator_function,
)
from starlette.datastructures import URL as URL  # noqa: F401
from starlette.datastructures import Address as Address  # noqa: F401
from starlette.datastructures import FormData as FormData  # noqa: F401
from starlette.datastructures import Headers as Headers  # noqa: F401
from starlette.datastructures import QueryParams as QueryParams  # noqa: F401
from starlette.datastructures import State as State  # noqa: F401

```Python hl_lines="2  6"
{!../../docs_src/static_files/tutorial001.py!}
```

/// note | "Teknik Detaylar"

Projenize dahil etmek için `from starlette.staticfiles import StaticFiles` kullanabilirsiniz.

**FastAPI**, geliştiricilere kolaylık sağlamak amacıyla `starlette.staticfiles`'ı `fastapi.staticfiles` olarak sağlar. Ancak `StaticFiles` sınıfı aslında doğrudan Starlette'den gelir.

///

### Bağlama (Mounting) Nedir?

```

/// note | "Technical Details"

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

from typing import Optional

from fastapi.openapi.models import OpenIdConnect as OpenIdConnectModel
from fastapi.security.base import SecurityBase
from starlette.exceptions import HTTPException
from starlette.requests import Request
from starlette.status import HTTP_403_FORBIDDEN
from typing_extensions import Annotated, Doc


class OpenIdConnect(SecurityBase):
    """
    OpenID Connect authentication class. An instance of it would be used as a

///

## Mais informações

Para aprender mais sobre as opções, verifique a documentação do Starlette para:

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

Тепер APIStar — це набір інструментів для перевірки специфікацій OpenAPI, а не веб-фреймворк.

/// info | "Інформація"

APIStar створив Том Крісті. Той самий хлопець, який створив:

 * Django REST Framework
 * Starlette (на якому базується **FastAPI**)
 * Uvicorn (використовується Starlette і **FastAPI**)

///