And an `APIRoute` subclass to use that custom request class.

### Create a custom `GzipRequest` class { #create-a-custom-gziprequest-class }

/// tip

This is a toy example to demonstrate how it works, if you need Gzip support, you can use the provided [`GzipMiddleware`](../advanced/middleware.md#gzipmiddleware){.internal-link target=_blank}.

///

 * @author Hayward Chan
 */
@GwtCompatible
@NullMarked
public final class ListGenerators {

  private ListGenerators() {}

  public static class ImmutableListOfGenerator extends TestStringListGenerator {
    @Override
    protected List<String> create(String[] elements) {
      return ImmutableList.copyOf(elements);
    }
  }

  public static class BuilderAddListGenerator extends TestStringListGenerator {
    @Override

    return this;
  }

  @SuppressWarnings("rawtypes") // class literals
  @Override
  protected List<Class<? extends AbstractTester>> getTesters() {
    List<Class<? extends AbstractTester>> testers = new ArrayList<>();
    if (runCollectionTests) {
      testers.addAll(super.getTesters());
    }

    testers.add(QueueElementTester.class);
    testers.add(QueueOfferTester.class);
    testers.add(QueuePeekTester.class);

 * @author Ben Yu
 */

@NullUnmarked
public class PackageSanityTests extends AbstractPackageSanityTests {

  public PackageSanityTests() throws Exception {
    DummySubscriber dummySubscriber = new DummySubscriber();
    setDefault(Subscriber.class, dummySubscriber.toSubscriber());
    setDefault(Method.class, DummySubscriber.subscriberMethod());
    setDefault(SubscriberExceptionContext.class, dummySubscriber.toContext());

## 開発者とつながる

以下で、<a href="https://tiangolo.com" class="external-link" target="_blank">開発者 (Sebastián Ramírez / `tiangolo`)</a> とコンタクトをとれます:

* <a href="https://github.com/tiangolo" class="external-link" target="_blank">**GitHub** でフォロー</a>。
    * 他のオープンソースプロジェクトを確認できます。何かの助けになるものが見つかるかもしれません。
    * 新たなオープンソースプロジェクトを作成したときに通知されます。
* <a href="https://x.com/tiangolo" class="external-link" target="_blank">**X (Twitter)** でフォロー</a>。

        scope.seed(Object.class, o2);
        assertSame(o2, scope.scope(Key.get(Object.class), () -> null).get());

        scope.exit();
        assertSame(o1, scope.scope(Key.get(Object.class), () -> null).get());

        scope.exit();

        assertThrows(IllegalStateException.class, () -> scope.exit());
    }

    @Test
    void testMultiKeyInstance() throws Exception {

///

In Python können Sie Kontextmanager erstellen, indem Sie <a href="https://docs.python.org/3/reference/datamodel.html#context-managers" class="external-link" target="_blank">eine Klasse mit zwei Methoden erzeugen: `__enter__()` und `__exit__()`</a>.

        checkNotBinaryCompatibleJava(
            v1 = """
                public class Source {
                    public String foo() { return "bar"; }
                    public String[] baz() { return new String[] {"some"}; }
                }
            """,
            v2 = """
                public class Source {
                    @$nullUnmarkedAnnotationName public String foo() { return "bar"; }

            return when (methodJsonNode.get("name")?.asText()) {
                null -> None
                None::class.simpleName -> None
                TestDistribution::class.simpleName -> TestDistribution
                TestDistributionAlpine::class.simpleName -> TestDistributionAlpine
                TeamCityParallelTests::class.simpleName ->
                    TeamCityParallelTests(

WebSocketErrorModel: type[BaseModel] = create_model("WebSocket")


class FastAPIError(RuntimeError):
    """
    A generic, FastAPI-specific error.
    """


class DependencyScopeError(FastAPIError):
    """
    A dependency declared that it depends on another dependency with an invalid
    (narrower) scope.
    """


class ValidationException(Exception):
    def __init__(
        self,