Zuerst einmal, Sie können `Path`-, `Query`- und Requestbody-Parameter-Deklarationen frei mischen und **FastAPI** wird wissen, was zu tun ist.

Und Sie können auch Body-Parameter als optional kennzeichnen, indem Sie den Defaultwert auf `None` setzen:

{* ../../docs_src/body_multiple_params/tutorial001_an_py310.py hl[18:20] *}

/// note | Hinweis

import java.io.File;
import java.lang.reflect.Field;

import org.apache.maven.artifact.Artifact;
import org.apache.maven.impl.resolver.DefaultArtifactDescriptorReader;
import org.eclipse.aether.impl.ArtifactDescriptorReader;
import org.eclipse.aether.impl.ArtifactResolver;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.assertEquals;

Wenden wir uns jetzt den spannenden Dingen zu. 🎉

## `Query` zu `Annotated` im `q`-Parameter hinzufügen

Jetzt, da wir `Annotated` für unsere Metadaten deklariert haben, fügen Sie `Query` hinzu, und setzen Sie den Parameter `max_length` auf `50`:

{* ../../docs_src/query_params_str_validations/tutorial002_an_py310.py hl[9] *}

- **Switch Expressions** - Optimized implementations using switch expressions for better performance
- **Sequenced Collections** - Full support for Java 21 sequenced collections API with dedicated utility methods
- **Performance Focused** - Optimized implementations for better runtime performance with reduced memory allocation
- **Type Safe** - Comprehensive use of generics and modern Java type system features

<a name="http2_naughty"></a>
#### ² HTTP/2 Cipher Suite Denylist

Cipher suites that are [discouraged for use][http2_denylist] with HTTP/2. OkHttp includes them because better suites are not commonly available. For example, none of the better cipher suites listed above shipped with Android 4.4 or Java 7.

[OkHttp30]: https://square.github.io/okhttp/changelog_3x/#version-300

import org.eclipse.aether.RepositorySystemSession;
import org.eclipse.aether.repository.LocalRepository;

import static org.codehaus.plexus.testing.PlexusExtension.getBasedir;

@PlexusTest
@Deprecated
public abstract class AbstractCoreMavenComponentTestCase {

    @Inject
    protected PlexusContainer container;

    @Inject
    protected org.eclipse.aether.RepositorySystem repositorySystem;

                Arguments.of(-1, -2L, -3L, -4L, -5L) // negative values
        );
    }

    // --- Mockito interaction: verify each getter is invoked and returns stubbed values ---
    @Test
    void mockitoMock_verifiesGetterInteractions() {
        // Arrange: mock and stub each getter with distinct values
        SmbBasicFileInfo mock = Mockito.mock(SmbBasicFileInfo.class);
        Mockito.when(mock.getAttributes()).thenReturn(7);

Sie können eine Datei optional machen, indem Sie Standard-Typannotationen verwenden und den Defaultwert auf `None` setzen:

{* ../../docs_src/request_files/tutorial001_02_an_py310.py hl[9,17] *}

## `UploadFile` mit zusätzlichen Metadaten

Sie können auch `File()` zusammen mit `UploadFile` verwenden, um zum Beispiel zusätzliche Metadaten zu setzen:

{* ../../docs_src/request_files/tutorial001_03_an_py39.py hl[9,15] *}

# Reference

Here's the reference or code API, the classes, functions, parameters, attributes, and
all the FastAPI parts you can use in your applications.

If you want to **learn FastAPI** you are much better off reading the

### Is concurrency better than parallelism? { #is-concurrency-better-than-parallelism }

Nope! That's not the moral of the story.

Concurrency is different than parallelism. And it is better on **specific** scenarios that involve a lot of waiting. Because of that, it generally is a lot better than parallelism for web application development. But not for everything.