```Python hl_lines="14-19"
{!../../docs_src/events/tutorial003.py!}
```

🥇 🍕 🔢, ⏭ `yield`, 🔜 🛠️ **⏭** 🈸 ▶️.

& 🍕 ⏮️ `yield` 🔜 🛠️ **⏮️** 🈸 ✔️ 🏁.

### 🔁 🔑 👨‍💼

🚥 👆 ✅, 🔢 🎀 ⏮️ `@asynccontextmanager`.

👈 🗜 🔢 🔘 🕳 🤙 "**🔁 🔑 👨‍💼**".

```Python hl_lines="1  13"
{!../../docs_src/events/tutorial003.py!}
```

**🔑 👨‍💼** 🐍 🕳 👈 👆 💪 ⚙️ `with` 📄, 🖼, `open()` 💪 ⚙️ 🔑 👨‍💼:

///

## ⌨ 💭 📛

➡️ 👀 ⏮️ 🖼 🔄:

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

`201` 👔 📟 "✍".

✋️ 👆 🚫 ✔️ ✍ ⚫️❔ 🔠 👉 📟 ⛓.

👆 💪 ⚙️ 🏪 🔢 ⚪️➡️ `fastapi.status`.

```Python hl_lines="1  6"
{!../../docs_src/response_status_code/tutorial002.py!}
```

👫 🏪, 👫 🧑‍🤝‍🧑 🎏 🔢, ✋️ 👈 🌌 👆 💪 ⚙️ 👨‍🎨 📋 🔎 👫:

また、書き込み操作では `async` と `await` を使用しないため、通常の `def` で関数を定義します。

```Python hl_lines="6-9"
{!../../docs_src/background_tasks/tutorial001.py!}
```

## バックグラウンドタスクの追加

*path operations 関数* 内で、`.add_task()` メソッドを使用してタスク関数を *background tasks* オブジェクトに渡します。

```Python hl_lines="14"
{!../../docs_src/background_tasks/tutorial001.py!}
```

`.add_task()` は以下の引数を受け取ります:

* バックグラウンドで実行されるタスク関数 (`write_notification`)。

///

### ✅ ⏮️ `root_path`

👆 💪 🤚 ⏮️ `root_path` ⚙️ 👆 🈸 🔠 📨, ⚫️ 🍕 `scope` 📖 (👈 🍕 🔫 🔌).

📥 👥 ✅ ⚫️ 📧 🎦 🎯.

```Python hl_lines="8"
{!../../docs_src/behind_a_proxy/tutorial001.py!}
```

⤴️, 🚥 👆 ▶️ Uvicorn ⏮️:

<div class="termy">

```console
$ uvicorn main:app --root-path /api/v1

* ✍ "`security` ⚖" ⚙️ `HTTPBasic`.
* ⚙️ 👈 `security` ⏮️ 🔗 👆 *➡ 🛠️*.
* ⚫️ 📨 🎚 🆎 `HTTPBasicCredentials`:
    * ⚫️ 🔌 `username` & `password` 📨.

```Python hl_lines="2  6  10"
{!../../docs_src/security/tutorial006.py!}
```

🕐❔ 👆 🔄 📂 📛 🥇 🕰 (⚖️ 🖊 "🛠️" 🔼 🩺) 🖥 🔜 💭 👆 👆 🆔 & 🔐:

<img src="/img/tutorial/security/image12.png">

## ✅ 🆔

📥 🌅 🏁 🖼.

⚙️ 🔗 ✅ 🚥 🆔 &amp; 🔐 ☑.

{* ../../docs_src/advanced_middleware/tutorial001.py hl[2,6] *}

## `TrustedHostMiddleware`

Garante que todas as requisições recebidas tenham um cabeçalho `Host` corretamente configurado, a fim de proteger contra ataques de cabeçalho de host HTTP.

{* ../../docs_src/advanced_middleware/tutorial002.py hl[2,6:8] *}

Os seguintes argumentos são suportados:

exports_files(glob(["requirements*"]) + [
    "configure",
    "configure.py",
    "ACKNOWLEDGEMENTS",
    "LICENSE",

```

</div>

/// info

📤 🎏 📁 &amp; 🧰 🔬 &amp; ❎ 📦 🔗.

👤 🔜 🎦 👆 🖼 ⚙️ 🎶 ⏪ 📄 🔛. 👶

///

### ✍ **FastAPI** 📟

* ✍ `app` 📁 &amp; ⛔ ⚫️.
* ✍ 🛁 📁 `__init__.py`.
* ✍ `main.py` 📁 ⏮️:

```Python
from typing import Union

from fastapi import FastAPI

app = FastAPI()


@app.get("/")
def read_root():
    return {"Hello": "World"}

* Sie können die `response` dann weiter modifizieren, bevor Sie sie zurückgeben.

```Python hl_lines="8-9  11  14"
{!../../docs_src/middleware/tutorial001.py!}
```

/// tip | "Tipp"

Para esses casos, você pode usar o `jsonable_encoder` para converter seus dados antes de repassá-los para a resposta:

```Python hl_lines="6-7  21-22"
{!../../docs_src/response_directly/tutorial001.py!}
```

/// note | Detalhes Técnicos

Você também pode utilizar `from starlette.responses import JSONResponse`.