🎯, 👆 💪 🔗 ⚙️ <a href="https://anyio.readthedocs.io/en/stable/" class="external-link" target="_blank">AnyIO</a> 👆 🏧 🛠️ ⚙️ 💼 👈 🚚 🌅 🏧 ⚓ 👆 👍 📟.

	return "Destination bucket does not exist: " + e.Bucket
}

// BucketRemoteTargetNotFound remote target does not exist.
type BucketRemoteTargetNotFound GenericError

func (e BucketRemoteTargetNotFound) Error() string {
	return "Remote target not found: " + e.Bucket
}

// RemoteTargetConnectionErr remote target connection failure.
type RemoteTargetConnectionErr struct {
	Err       error
	Bucket    string

## 🌖 ⚒

📤 ➕ ⚒ 🍵 💂‍♂ ↖️ ⚪️➡️ 🕐 📔 [🔰 - 👩‍💻 🦮: 💂‍♂](../../tutorial/security/index.md){.internal-link target=_blank}.

/// tip

⏭ 📄 **🚫 🎯 "🏧"**.

 & ⚫️ 💪 👈 👆 ⚙️ 💼, ⚗ 1️⃣ 👫.

///

## ✍ 🔰 🥇

⏭ 📄 🤔 👆 ⏪ ✍ 👑 [🔰 - 👩‍💻 🦮: 💂‍♂](../../tutorial/security/index.md){.internal-link target=_blank}.

  @CanIgnoreReturnValue // TODO(kak): consider removing this
  @Override
  public <T> T newProxy(
      T target, Class<T> interfaceType, long timeoutDuration, TimeUnit timeoutUnit) {
    checkNotNull(target);
    checkNotNull(interfaceType);
    checkNotNull(timeoutUnit);
    return target; // ha ha
  }

  @CanIgnoreReturnValue // TODO(kak): consider removing this
  @Override
  @ParametricNullness

👆 💪 🚮 👆 📂 🎚 🎻, 🚮 ⚫️ `Response`, & 📨 ⚫️:

```Python hl_lines="1  18"
{!../../docs_src/response_directly/tutorial002.py!}
```

## 🗒

🕐❔ 👆 📨 `Response` 🔗 🚮 📊 🚫 ✔, 🗜 (🎻), 🚫 📄 🔁.

✋️ 👆 💪 📄 ⚫️ 🔬 [🌖 📨 🗄](additional-responses.md){.internal-link target=_blank}.

```

</div>

&amp; 📂 🩺 <a href="http://127.0.0.1:8000/docs" class="external-link" target="_blank">http://127.0.0.1:8000/docs</a>.

👆 🔜 👀 🏧 🛠️ 🩺 👑 📱, 🔌 🕴 🚮 👍 _➡ 🛠️_:

<img src="/img/tutorial/sub-applications/image01.png">

&amp; ⤴️, 📂 🩺 🎧-🈸, <a href="http://127.0.0.1:8000/subapi/docs" class="external-link" target="_blank">http://127.0.0.1:8000/subapi/docs</a>.

任何一个可以与以下内容一起使用的函数：

* <a href="https://docs.python.org/3/library/contextlib.html#contextlib.contextmanager" class="external-link" target="_blank">`@contextlib.contextmanager`</a> 或者
* <a href="https://docs.python.org/3/library/contextlib.html#contextlib.asynccontextmanager" class="external-link" target="_blank">`@contextlib.asynccontextmanager`</a>

都可以作为 **FastAPI** 的依赖项。

实际上，FastAPI内部就使用了这两个装饰器。

///

## 使用 `yield` 的数据库依赖项

👆 👀 ⏮️ 📃 🔃 [🛠️ 🔧](concepts.md){.internal-link target=_blank}, 📤 💗 🎛 👆 💪 ⚙️.

📥 👤 🔜 🎦 👆 ❔ ⚙️ <a href="https://gunicorn.org/" class="external-link" target="_blank">**🐁**</a> ⏮️ **Uvicorn 👨‍🏭 🛠️**.

/// info

🚥 👆 ⚙️ 📦, 🖼 ⏮️ ☁ ⚖️ Kubernetes, 👤 🔜 💬 👆 🌅 🔃 👈 ⏭ 📃: [FastAPI 📦 - ☁](docker.md){.internal-link target=_blank}.

									<a class="nav-link active" href="${eolLink}" target="_olh"><em class="fas fa-times-circle text-danger"></a>
								</li>
							</c:if>
							<c:if test="${developmentMode}">
								<li class="nav-item" data-toggle="tooltip" data-placement="left"
									title="<la:message key="labels.development_mode_warning" />"
								><a class="nav-link active" href="${installationLink}" target="_olh"><em

## Détails techniques

La classe `BackgroundTasks` provient directement de <a href="https://www.starlette.io/background/" class="external-link" target="_blank">`starlette.background`</a>.