Now start Traefik:

<div class="termy">

```console
$ ./traefik --configFile=traefik.toml

INFO[0000] Configuration loaded from file: /home/user/awesomeapi/traefik.toml
```

</div>

And now start your app, using the `--root-path` option:

<div class="termy">

```console

     <span style="background-color:#007166"><font color="#D3D7CF"> INFO </font></span>  Application startup complete.
```

</div>

////

//// tab | `uvicorn`

如果你偏好直接使用 `uvicorn` 指令：

<div class="termy">

```console
$ uvicorn main:app --host 0.0.0.0 --port 8080 --workers 4

### 查看自动 API 文档 { #check-the-automatic-api-docs }

现在，运行 `fastapi` 命令：

<div class="termy">

```console
$ fastapi dev

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

</div>

然后在 [http://127.0.0.1:8000/docs](http://127.0.0.1:8000/docs) 打开文档。

下图显示的是主应用 API 文档，只包括其自有的*路径操作*。

					<div class="input-group-append">
						<button class="btn btn-sidebar" type="submit" name="search" id="search-btn">
							<i class="fa fa-search" aria-hidden="true"></i>
						</button>
					</div>
				</div>
			</form>
		</c:if>
		<nav class="mt-2">

		<ul class="nav nav-pills nav-sidebar flex-column" data-widget="treeview" role="menu">

まず、[仮想環境](../virtual-environments.md)を作成して有効化し、`pydantic-settings` パッケージをインストールします:

<div class="termy">

```console
$ pip install pydantic-settings
---> 100%
```

</div>

また、次のように `all` エクストラをインストールすると付属します:

<div class="termy">

```console
$ pip install "fastapi[all]"
---> 100%
```

</div>

### `Settings` オブジェクトを作成 { #create-the-settings-object }

然後 Traefik 會把它的請求轉發到在 `http://127.0.0.1:8000` 上運行的 Uvicorn。

現在啟動 Traefik：

<div class="termy">

```console
$ ./traefik --configFile=traefik.toml

INFO[0000] Configuration loaded from file: /home/user/awesomeapi/traefik.toml
```

</div>

然後啟動你的應用，使用 `--root-path` 選項：

<div class="termy">

```console
$ fastapi run main.py --forwarded-allow-ips="*" --root-path /api/v1

<div class="termy">

```console
$ pip install pydantic-settings
---> 100%
```

</div>

It also comes included when you install the `all` extras with:

<div class="termy">

```console
$ pip install "fastapi[all]"
---> 100%
```

</div>

### Create the `Settings` object { #create-the-settings-object }

<div class="termy">

```console
$ pip install pytest

---> 100%
```

</div>

It will detect the files and tests automatically, execute them, and report the results back to you.

Run the tests with:

<div class="termy">

```console
$ pytest

接著在建立 `FastAPI` 應用時使用它。

然後你可以將環境變數 `OPENAPI_URL` 設為空字串，以停用 OpenAPI（包含文件 UI），如下：

<div class="termy">

```console
$ OPENAPI_URL= uvicorn main:app

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

</div>

之後若你造訪 `/openapi.json`、`/docs` 或 `/redoc`，會看到如下的 `404 Not Found` 錯誤：

```JSON
{
    "detail": "Not Found"
}

Make sure you create a [virtual environment](../../virtual-environments.md), activate it, and then install `pyjwt`:

<div class="termy">

```console
$ pip install pyjwt

---> 100%
```

</div>

/// info

If you are planning to use digital signature algorithms like RSA or ECDSA, you should install the cryptography library dependency `pyjwt[crypto]`.