<snapshots>
                <enabled>true</enabled>
            </snapshots>
        </repository>
        <repository>
            <id>teamcity-server</id>
            <url>https://builds.gradle.org/app/dsl-plugins-repository</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </repository>
        <repository>
            <id>maven_central</id>

    @Resource
    private FesenClient fesenClient;

    private OpenSearchRunner runner;

    @Override
    protected String prepareConfigFile() {
        return "app.xml";
    }

    @Override
    protected boolean isUseOneTimeContainer() {
        return true;
    }

    @Override
    public void setUp() throws Exception {
        // create runner instance

import pytest
from dirty_equals import IsDict
from fastapi.testclient import TestClient


@pytest.fixture(name="client")
def get_client():
    from docs_src.bigger_applications.app_an.main import app

    client = TestClient(app)
    return client


def test_users_token_jessica(client: TestClient):
    response = client.get("/users?token=jessica")
    assert response.status_code == 200

set FESS_JAVA_OPTS=%FESS_JAVA_OPTS% -Dfess.context.path=/
set FESS_JAVA_OPTS=%FESS_JAVA_OPTS% -Dfess.port=8080
set FESS_JAVA_OPTS=%FESS_JAVA_OPTS% -Dfess.webapp.path=%FESS_HOME%\app
set FESS_JAVA_OPTS=%FESS_JAVA_OPTS% -Dfess.temp.path=%FESS_HOME%\temp
set FESS_JAVA_OPTS=%FESS_JAVA_OPTS% -Dfess.log.name=%APP_NAME%
set FESS_JAVA_OPTS=%FESS_JAVA_OPTS% -Dfess.log.path=%FESS_HOME%\logs

If there were any background tasks (documented later), they will run *after* all the middleware.

///

## Create a middleware

To create a middleware you use the decorator `@app.middleware("http")` on top of a function.

The middleware function receives:

* The `request`.
* A function `call_next` that will receive the `request` as a parameter.

    * If you are comparing Uvicorn, compare it against Daphne, Hypercorn, uWSGI, etc. Application servers.
* **Starlette**:

```

</div>

それぞれのオプションの意味を見てみましょう：

* `main:app`： `main`は"`main`"という名前のPythonモジュール、つまりファイル`main.py`を意味します。そして `app` は **FastAPI** アプリケーションの変数名です。
    * main:app`はPythonの`import`文と同じようなものだと想像できます：

        ```Python
        from main import app
        ```

    * つまり、`main:app`のコロンは、`from main import app`のPythonの`import`の部分と同じになります。

* `--workers`： 使用するワーカー・プロセスの数で、それぞれがUvicornのワーカーを実行します。

  istioctl x check-inject deployment/details-v1 -n test

  # Check the injection status of label pairs in a specific namespace before actual injection 
  istioctl x check-inject -n test -l app=helloworld,version=v1
`,
		Args: func(cmd *cobra.Command, args []string) error {
			if len(args) == 0 && labelPairs == "" || len(args) > 1 {
				cmd.Println(cmd.UsageString())

{!../../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!}

```

请求 `/unicorns/yolo` 时，路径操作会触发 `UnicornException`。

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