* Defines events that the model builder fires during construction of the effective model. When a listener encounters
 * errors while processing the event, it can report these problems via {@link ModelBuildingEvent#getProblems()}.
 * <em>Note:</em> To cope with future extensions to this interface, it is strongly recommended to extend
 * {@link AbstractModelBuildingListener} rather than to directly implement this interface.
 *

     */
    @Nonnull
    VersionConstraint getVersionConstraint();

    /**
     * Returns the file extension of the artifact.
     * The dot separator is <em>not</em> included in the returned string.
     *
     * @return the file extension or an empty string if none, never {@code null}
     */
    @Nonnull
    String getExtension();

    /**

import org.apache.maven.artifact.versioning.ArtifactVersion;
import org.apache.maven.artifact.versioning.OverConstrainedVersionException;

/**
 * Resolves conflicting artifacts by always selecting the <em>oldest</em> declaration. Oldest is defined as the
 * declaration whose version is less according to <code>ArtifactVersion.compareTo</code>.
 *
 * @see ArtifactVersion#compareTo
 * @since 3.0
 */
@Named("oldest")
@Singleton

import javax.inject.Named;
import javax.inject.Singleton;

import org.apache.maven.artifact.resolver.ResolutionNode;

/**
 * Resolves conflicting artifacts by always selecting the <em>nearest</em> declaration. Nearest is defined as the
 * declaration that has the least transitive steps away from the project being built.
 *
 * @since 3.0
 */
@Named("nearest")
@Singleton
@Deprecated

 * (doing so results in {@code ClassCastException}).
 *
 * <p>This class and its iterator implement all of the <em>optional</em> methods of the {@link
 * Collection} and {@link Iterator} interfaces. The Iterator provided in method {@link #iterator()}
 * is <em>not</em> guaranteed to traverse the elements of the MonitorBasedPriorityBlockingQueue in
 * any particular order. If you need ordered traversal, consider using {@code

# Retorno - Altere o Código de Status

Você provavelmente leu anteriormente que você pode definir um [Código de Status do Retorno](../tutorial/response-status-code.md){.internal-link target=_blank} padrão.

Porém em alguns casos você precisa retornar um código de status diferente do padrão.

## Caso de uso

Por exemplo, imagine que você deseja retornar um código de status HTTP de "OK" `200` por padrão.

import org.apache.maven.artifact.versioning.ArtifactVersion;
import org.apache.maven.artifact.versioning.OverConstrainedVersionException;

/**
 * Resolves conflicting artifacts by always selecting the <em>newest</em> declaration. Newest is defined as the
 * declaration whose version is greater according to <code>ArtifactVersion.compareTo</code>.
 *
 * @see ArtifactVersion#compareTo
 * @since 3.0
 */
@Named("newest")
@Singleton

							<div class="card-footer">
								<button type="submit" class="btn btn-primary ${f:h(editableClass)}" name="upgradeFrom"
									value="<la:message key="labels.upgrade_start_button"/>"
								>
									<em class="fa fa-arrow-circle-right"></em>
									<la:message key="labels.upgrade_start_button" />
								</button>
							</div>
						</div>
					</div>
				</la:form>
			</section>
		</div>

* Os parâmetros das rotas.
* Cabeçalhos (*Headers*).
* Cookies.
* etc.

E ao fazer isso, o **FastAPI** está validando as informações, convertendo-as e gerando documentação para a sua API automaticamente.

Porém há situações em que você possa precisar acessar o objeto `Request` diretamente.

## Detalhes sobre o objeto `Request`

                                <div class="row top10">
                                    <div class="col-sm-12">
                                        <em class="fa fa-info-circle text-primary"></em>
                                        <la:message key="labels.list_could_not_find_crud_table"/>
                                    </div>
                                </div>