* during {@code Executor.execute} (e.g., a {@code RejectedExecutionException} or an exception
   * thrown by {@linkplain MoreExecutors#directExecutor direct execution}) will be caught and
   * logged.
   *
   * <p>Note: If your listener is lightweight -- and will not cause stack overflow by completing
   * more futures or adding more {@code directExecutor()} listeners inline -- consider {@link

  /**
   * Sets the naming format to use when naming threads ({@link Thread#setName}) which are created
   * with this ThreadFactory.
   *
   * <p><b>Java 21+ users:</b> use {@link Thread.Builder#name(String, long)} instead. Note that
   * {@link #setNameFormat} accepts a thread name <i>format string</i> (e.g., {@code
   * threadFactoryBuilder.setNameFormat("rpc-pool-%d")}), while {@code threadBuilder.name()} accepts

   * reached, the proxy will attempt to abort the call to the target, and will throw an {@link
   * UncheckedTimeoutException} to the caller.
   *
   * <p>It is important to note that the primary purpose of the proxy object is to return control to
   * the caller when the timeout elapses; aborting the target method call is of secondary concern.

app.add_middleware(UnicornMiddleware, some_config="rainbow")
```

`app.add_middleware()` 將中介軟體類別作為第一個引數，並接收要傳遞給該中介軟體的其他引數。

## 內建中介軟體 { #integrated-middlewares }

**FastAPI** 內建數個常見用途的中介軟體，以下將示範如何使用。

/// note | 技術細節

在接下來的範例中，你也可以使用 `from starlette.middleware.something import SomethingMiddleware`。

**FastAPI** 在 `fastapi.middleware` 中提供了一些中介軟體，純粹是為了方便你這位開發者。但大多數可用的中介軟體直接來自 Starlette。

///

 * GroovyClassLoader. The cache uses Guava Cache with segment-based locking for
 * lock-free concurrent reads. Each evaluate() call creates a new Script instance
 * to ensure thread isolation of bindings.</p>
 *
 * <p>Note on class-level isolation: Compiled Script classes are cached and reused.
 * Class-level state (static fields, metaclass mutations) persists across evaluations
 * of the same script. In Fess, scripts are short expressions configured by