val headers =
      Headers.Builder()
        .add("content-length", "99")
        .add("authorization", "peanutbutter")
        .add("proxy-authorization", "chocolate")
        .add("cookie", "drink=coffee")
        .add("set-cookie", "accessory=sugar")
        .add("user-agent", "OkHttp")
        .build()
    val request =
      Request(
        "https://square.com".toHttpUrl(),
        headers,
      )

    from typing import Annotated

    from fastapi import (
        Cookie,
        FastAPI,
        WebSocket,
        WebSocketException,
        status,
    )

    app = FastAPI()

    @app.websocket("/items/{item_id}/ws")
    async def websocket_endpoint(
        *,
        websocket: WebSocket,
        session: Annotated[str | None, Cookie()] = None,
        item_id: str,
    ):
        if session is None:

    * It depends on the `query_extractor`, and assigns the value returned by it to the parameter `q`.
* It also declares an optional `last_query` cookie, as a `str`.
    * If the user didn't provide any query `q`, we use the last query used, which we saved to a cookie before.

## Use the dependency

Then we can use the dependency with:

//// tab | Python 3.10+

```Python hl_lines="23"

    * Sie hängt von `query_extractor` ab und weist den von diesem zurückgegebenen Wert dem Parameter `q` zu.
* Sie deklariert außerdem ein optionales `last_query`-Cookie, ein `str`.
    * Wenn der Benutzer keine Query `q` übermittelt hat, verwenden wir die zuletzt übermittelte Query, die wir zuvor in einem Cookie gespeichert haben.

## Die Abhängigkeit verwenden

Diese Abhängigkeit verwenden wir nun wie folgt:

//// tab | Python 3.10+

    val headers =
      Headers.Builder()
        .add("content-length", "99")
        .add("authorization", "peanutbutter")
        .add("proxy-authorization", "chocolate")
        .add("cookie", "drink=coffee")
        .add("set-cookie", "accessory=sugar")
        .add("user-agent", "OkHttp")
        .build()
    val request =
      Request(
        "https://square.com".toHttpUrl(),
        headers,
      )

    page = context.new_page()
    page.goto("http://localhost:8000/docs")
    page.get_by_role("link", name="/items/").click()
    # Manually add the screenshot
    page.screenshot(path="docs/en/docs/img/tutorial/cookie-param-models/image01.png")

    # ---------------------
    context.close()
    browser.close()


process = subprocess.Popen(
    ["fastapi", "run", "docs_src/cookie_param_models/tutorial001.py"]
)
try:

{!../../docs_src/dependencies/tutorial005.py!}
```

这里重点说明一下声明的参数：

* 尽管该函数自身是依赖项，但还声明了另一个依赖项（它「依赖」于其他对象）
    * 该函数依赖 `query_extractor`, 并把 `query_extractor` 的返回值赋给参数 `q`
* 同时，该函数还声明了类型是 `str` 的可选 cookie（`last_query`）
    * 用户未提供查询参数 `q` 时，则使用上次使用后保存在 cookie 中的查询

### 使用依赖项

接下来，就可以使用依赖项：

```Python hl_lines="22"
{!../../docs_src/dependencies/tutorial005.py!}
```

/// info | "信息"

///

## `example` e `examples` no OpenAPI

Ao usar quaisquer dos:

* `Path()`
* `Query()`
* `Header()`
* `Cookie()`
* `Body()`
* `Form()`
* `File()`

você também pode declarar um dado `example` ou um grupo de `examples` com informações adicionais que serão adicionadas ao **OpenAPI**.

### `Body` com `example`

from ._compat import PYDANTIC_V2, PYDANTIC_VERSION, Undefined

_Unset: Any = Undefined


class ParamTypes(Enum):
    query = "query"
    header = "header"
    path = "path"
    cookie = "cookie"


class Param(FieldInfo):
    in_: ParamTypes

    def __init__(
        self,
        default: Any = Undefined,
        *,
        default_factory: Union[Callable[[], Any], None] = _Unset,

```

////

/// warning

🚧 🤯 👈 📚 ➕ ❌ 🚶‍♀️ 🏆 🚫 🚮 🙆 🔬, 🕴 ➕ ℹ, 🧾 🎯.

///

## `example` & `examples` 🗄

🕐❔ ⚙️ 🙆:

* `Path()`
* `Query()`
* `Header()`
* `Cookie()`
* `Body()`
* `Form()`
* `File()`

👆 💪 📣 💽 `example` ⚖️ 👪 `examples` ⏮️ 🌖 ℹ 👈 🔜 🚮 **🗄**.

### `Body` ⏮️ `example`

📥 👥 🚶‍♀️ `example` 📊 ⌛ `Body()`:

//// tab | 🐍 3️⃣.6️⃣ & 🔛