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  2. github.com/tiangolo/fastapi

    docs/zh/docs/tutorial/handling-errors.md 

    ```Python hl_lines="14"
{!../../docs_src/handling_errors/tutorial002.py!}

```

## 安装自定义异常处理器

添加自定义处理器，要使用 [Starlette 的异常工具](https://www.starlette.io/exceptions/)。

假设要触发的自定义异常叫作 `UnicornException`。

且需要 FastAPI 实现全局处理该异常。

此时，可以用 `@app.exception_handler()` 添加自定义异常控制器：

```Python hl_lines="5-7  13-18  24"
{!../../docs_src/handling_errors/tutorial003.py!}

```
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  3. github.com/tiangolo/fastapi

    docs/em/docs/tutorial/path-params.md 

    ```Python hl_lines="16"
{!../../docs_src/path_params/tutorial005.py!}
```

### ✅ 🩺

↩️ 💪 💲 *➡ 🔢* 🔢, 🎓 🩺 💪 🎦 👫 🎆:

<img src="/img/tutorial/path-params/image03.png">

### 👷 ⏮️ 🐍 *🔢*

💲 *➡ 🔢* 🔜 *🔢 👨‍🎓*.

#### 🔬 *🔢 👨‍🎓*

👆 💪 🔬 ⚫️ ⏮️ *🔢 👨‍🎓* 👆 ✍ 🔢 `ModelName`:

```Python hl_lines="17"
{!../../docs_src/path_params/tutorial005.py!}
```

#### 🤚 *🔢 💲*
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  4. github.com/tiangolo/fastapi

    tests/test_tutorial/test_behind_a_proxy/test_tutorial001.py 

    from fastapi.testclient import TestClient

from docs_src.behind_a_proxy.tutorial001 import app

client = TestClient(app, root_path="/api/v1")


def test_main():
    response = client.get("/app")
    assert response.status_code == 200
    assert response.json() == {"message": "Hello World", "root_path": "/api/v1"}


def test_openapi():
    response = client.get("/openapi.json")
    assert response.status_code == 200
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  5. github.com/tiangolo/fastapi

    tests/test_tutorial/test_websockets/test_tutorial001.py 

    import pytest
from fastapi.testclient import TestClient
from fastapi.websockets import WebSocketDisconnect

from docs_src.websockets.tutorial001 import app

client = TestClient(app)


def test_main():
    response = client.get("/")
    assert response.status_code == 200, response.text
    assert b"<!DOCTYPE html>" in response.content


def test_websocket():
    with pytest.raises(WebSocketDisconnect):
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  6. github.com/tiangolo/fastapi

    docs/zh/docs/advanced/custom-response.md 

    ///

```Python hl_lines="2 7"
{!../../docs_src/custom_response/tutorial001.py!}
```

/// tip | "小贴士"

`ORJSONResponse` 可能是一个更快的选择。

///

### `RedirectResponse`

返回 HTTP 重定向。默认情况下使用 307 状态代码（临时重定向）。

```Python hl_lines="2  9"
{!../../docs_src/custom_response/tutorial006.py!}
```

### `StreamingResponse`

采用异步生成器或普通生成器/迭代器，然后流式传输响应主体。
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  7. github.com/tiangolo/fastapi

    docs/em/docs/advanced/openapi-callbacks.md 

    {!../../docs_src/openapi_callbacks/tutorial001.py!}
```

### ✍ ⏲ *➡ 🛠️*

✍ ⏲ *➡ 🛠️* ⚙️ 🎏 `APIRouter` 👆 ✍ 🔛.

⚫️ 🔜 👀 💖 😐 FastAPI *➡ 🛠️*:

* ⚫️ 🔜 🎲 ✔️ 📄 💪 ⚫️ 🔜 📨, ✅ `body: InvoiceEvent`.
*  &amp; ⚫️ 💪 ✔️ 📄 📨 ⚫️ 🔜 📨, ✅ `response_model=InvoiceEventReceived`.

```Python hl_lines="16-18  21-22  28-32"
{!../../docs_src/openapi_callbacks/tutorial001.py!}
```
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  8. github.com/tiangolo/fastapi

    tests/test_tutorial/test_first_steps/test_tutorial001.py 

    import pytest
from fastapi.testclient import TestClient

from docs_src.first_steps.tutorial001 import app

client = TestClient(app)


@pytest.mark.parametrize(
    "path,expected_status,expected_response",
    [
        ("/", 200, {"message": "Hello World"}),
        ("/nonexistent", 404, {"detail": "Not Found"}),
    ],
)
def test_get_path(path, expected_status, expected_response):
    response = client.get(path)
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  9. github.com/tiangolo/fastapi

    docs/pt/docs/advanced/behind-a-proxy.md 

    Nesse caso, o caminho original `/app` seria servido em `/api/v1/app`.

Embora todo o seu código esteja escrito assumindo que existe apenas `/app`.

{* ../../docs_src/behind_a_proxy/tutorial001.py hl[6] *}
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  10. github.com/tiangolo/fastapi

    docs/ja/docs/tutorial/body.md 

    ## Pydanticの `BaseModel` をインポート

ます初めに、 `pydantic` から `BaseModel` をインポートする必要があります:

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

## データモデルの作成

そして、`BaseModel` を継承したクラスとしてデータモデルを宣言します。

すべての属性にpython標準の型を使用します:

```Python hl_lines="5-9"
{!../../docs_src/body/tutorial001.py!}
```

クエリパラメータの宣言と同様に、モデル属性がデフォルト値をもつとき、必須な属性ではなくなります。それ以外は必須になります。オプショナルな属性にしたい場合は `None` を使用してください。
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  11. github.com/tiangolo/fastapi

    docs/em/docs/tutorial/body-fields.md 

    ## 🗄 `Field`

🥇, 👆 ✔️ 🗄 ⚫️:

//// tab | 🐍 3️⃣.6️⃣ &amp; 🔛

```Python hl_lines="4"
{!> ../../docs_src/body_fields/tutorial001.py!}
```

////

//// tab | 🐍 3️⃣.1️⃣0️⃣ &amp; 🔛

```Python hl_lines="2"
{!> ../../docs_src/body_fields/tutorial001_py310.py!}
```

////

/// warning
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