Wenn Sie diese Sichtweise (des *externen Entwicklers*) vorübergehend übernehmen, wird es offensichtlicher, wo die Parameter, das Pydantic-Modell für den Body, die Response, usw. für diese *externe API* hingehören.

///

### Einen Callback-`APIRouter` erstellen

Erstellen Sie zunächst einen neuen `APIRouter`, der einen oder mehrere Callbacks enthält.

 * under the License.
 */
package org.apache.maven.repository.internal;

import org.apache.maven.api.VersionConstraint;
import org.apache.maven.api.services.VersionParserException;
import org.apache.maven.api.services.model.ModelVersionParser;
import org.eclipse.aether.util.version.GenericVersionScheme;
import org.junit.jupiter.api.Test;

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

 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.execution;

import org.apache.maven.settings.Settings;
import org.apache.maven.toolchain.model.PersistedToolchains;

/**
 * Assists in populating an execution request for invocation of Maven.
 *
 */
public interface MavenExecutionRequestPopulator {
    /**

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package model

import java.util.LinkedList
import kotlin.math.min

/**

Sadəcə standart **Python**.

Məsələn, `int` üçün:

```Python
item_id: int
```

və ya daha mürəkkəb `Item` modeli üçün:

```Python
item: Item
```

...və yalnız parametr tipini təyin etməklə bunları əldə edirsiniz:

* Redaktor dəstəyi ilə:
    * Avtomatik tamamlama.
    * Tip yoxlanması.

#### `RequestValidationError`と`ValidationError`

/// warning | "注意"

これらは今のあなたにとって重要でない場合は省略しても良い技術的な詳細です。

///

`RequestValidationError`はPydanticの<a href="https://docs.pydantic.dev/latest/concepts/models/#error-handling" class="external-link" target="_blank">`ValidationError`</a>のサブクラスです。

**FastAPI** は`response_model`でPydanticモデルを使用していて、データにエラーがあった場合、ログにエラーが表示されるようにこれを使用しています。

O Pydantic tem um comportamento especial quando você usa `Optional` ou `Union[Something, None]` sem um valor padrão. Você pode ler mais sobre isso na documentação do Pydantic sobre <a href="https://docs.pydantic.dev/2.3/usage/models/#required-fields" class="external-link" target="_blank">campos Opcionais Obrigatórios</a>.

///


## Type Hints com Metadados de Anotações

/// tip

Pydantic ✔️ 🎁 🎭 🕐❔ 👆 ⚙️ `Optional` ⚖️ `Union[Something, None]` 🍵 🔢 💲, 👆 💪 ✍ 🌅 🔃 ⚫️ Pydantic 🩺 🔃 <a href="https://docs.pydantic.dev/latest/concepts/models/#required-optional-fields" class="external-link" target="_blank">✔ 📦 🏑</a>.

///

## 🆎 🔑 **FastAPI**

**FastAPI** ✊ 📈 👫 🆎 🔑 📚 👜.

⏮️ **FastAPI** 👆 📣 🔢 ⏮️ 🆎 🔑 &amp; 👆 🤚:

import java.util.Objects;
import java.util.Properties;

import org.apache.maven.artifact.repository.ArtifactRepository;
import org.apache.maven.eventspy.internal.EventSpyDispatcher;
import org.apache.maven.model.Profile;
import org.apache.maven.model.root.RootLocator;
import org.apache.maven.project.DefaultProjectBuildingRequest;
import org.apache.maven.project.ProjectBuildingRequest;
import org.apache.maven.properties.internal.SystemProperties;

import org.apache.maven.api.services.ToolchainsBuilder;
import org.apache.maven.api.services.ToolchainsBuilderRequest;
import org.apache.maven.api.services.ToolchainsBuilderResult;
import org.apache.maven.api.services.model.ModelProcessor;
import org.apache.maven.cli.CLIReportingUtils;
import org.apache.maven.cli.event.ExecutionEventLogger;
import org.apache.maven.cling.invoker.LookupInvoker;
import org.apache.maven.cling.invoker.ProtoLookup;