💰 🙋‍♀ ⚠ 🤭 `return`😅 💲 🔜 🌖 ⭐ 📄 🔃 🔗 & 💂‍♂.

👉 🖼, 🕐❔ 👩‍💻 📨 🏬 🆔 👈 🚫 🔀, 🤚 ⚠ ⏮️ 👔 📟 `404`:

```Python hl_lines="11"
{!../../../docs_src/handling_errors/tutorial001.py!}
```

### 📉 📨

🚥 👩‍💻 📨 `http://example.com/items/foo` ( `item_id` `"foo"`), 👈 👩‍💻 🔜 📨 🇺🇸🔍 👔 📟 2️⃣0️⃣0️⃣, & 🎻 📨:

		{httpServer1.URL, "", nil},
		{httpServer2.URL, "fbe246edbd382902db9a4035df7dce8cb441357d minio.RELEASE.2016-10-07T01-16-39Z\n", nil},
		{httpServer3.URL, "", fmt.Errorf("Error downloading URL " + httpServer3.URL + ". Response: 404 Not Found")},
	}

	for _, testCase := range testCases {
		u, err := url.Parse(testCase.releaseChecksumURL)
		if err != nil {
			t.Fatal(err)
		}

        final ResponseData responseData = client.execute(RequestDataBuilder.newRequestData().get().url(url).build());
        if (responseData.getHttpStatusCode() == 404) {
            response.httpStatus(responseData.getHttpStatusCode());
            CloseableUtil.closeQuietly(responseData);
            return response;
        }
        writeFileName(response, responseData);

```

!!! tip
    This last path operation will have the combination of tags: `["items", "custom"]`.

    And it will also have both responses in the documentation, one for `404` and one for `403`.

## The main `FastAPI`

Now, let's see the module at `app/main.py`.

Here's where you import and use the class `FastAPI`.

{!../../../docs_src/bigger_applications/app/routers/items.py!}
```

!!! tip
    👉 🏁 ➡ 🛠️ 🔜 ✔️ 🌀 🔖: `["items", "custom"]`.

     & ⚫️ 🔜 ✔️ 👯‍♂️ 📨 🧾, 1️⃣ `404` & 1️⃣ `403`.

## 👑 `FastAPI`

🔜, ➡️ 👀 🕹 `app/main.py`.

📥 🌐❔ 👆 🗄 & ⚙️ 🎓 `FastAPI`.

👉 🔜 👑 📁 👆 🈸 👈 👔 🌐 👯‍♂️.

& 🏆 👆 ⚛ 🔜 🔜 🖖 🚮 👍 🎯 🕹, 👑 📁 🔜 🙅.

			// whether you also have the s3:ListBucket
			// permission.
			// * If you have the s3:ListBucket permission
			//   on the bucket, Amazon S3 will return an
			//   HTTP status code 404 ("no such key")
			//   error.
			// * if you don’t have the s3:ListBucket
			//   permission, Amazon S3 will return an HTTP
			//   status code 403 ("access denied") error.`

		},

		// Test case - 8.
		// Test case with non-existent source file.
		// Case for the purpose of failing `api.ObjectAPI.GetObjectInfo`.
		// Expecting the response status code to http.StatusNotFound (404).
		{
			bucketName:       bucketName,
			uploadID:         uploadID,
			copySourceHeader: url.QueryEscape(SlashSeparator + bucketName + SlashSeparator + "non-existent-object"),

```Python hl_lines="30-31" title="app/routers/items.py"
{!../../../docs_src/bigger_applications/app/routers/items.py!}
```

!!! tip
    最后的这个路径操作将包含标签的组合：`["items"，"custom"]`。

    并且在文档中也会有两个响应，一个用于 `404`，一个用于 `403`。

## `FastAPI` 主体

现在，让我们来看看位于 `app/main.py` 的模块。

在这里你导入并使用 `FastAPI` 类。

这将是你的应用程序中将所有内容联结在一起的主文件。

并且由于你的大部分逻辑现在都存在于其自己的特定模块中，因此主文件的内容将非常简单。

### 导入 `FastAPI`

```

!!! tip "Tipp"
    Diese letzte Pfadoperation wird eine Kombination von Tags haben: `["items", "custom"]`.

    Und sie wird auch beide Responses in der Dokumentation haben, eine für `404` und eine für `403`.

## Das Haupt-`FastAPI`.

Sehen wir uns nun das Modul unter `app/main.py` an.

Hier importieren und verwenden Sie die Klasse `FastAPI`.

@pytest.mark.parametrize(
    "path,expected_status,expected_response",
    [
        ("/api_route", 200, {"message": "Hello World"}),
        ("/non_decorated_route", 200, {"message": "Hello World"}),
        ("/nonexistent", 404, {"detail": "Not Found"}),
    ],
)
def test_get_path(path, expected_status, expected_response):
    response = client.get(path)
    assert response.status_code == expected_status