* Resolving is the process that selects a {@linkplain #getVersion() particular version}
 * and downloads the artifact in the local repository.  This operation returns a {@link DownloadedArtifact}.
 * </p>
 *
 * @since 4.0.0
 */
@Experimental
@Immutable
public interface Artifact {
    /**
     * {@return a unique identifier for this artifact}
     * The identifier is composed of groupId, artifactId, extension, classifier, and version.

import org.apache.maven.api.annotations.Nonnull;
import org.apache.maven.api.settings.Settings;

/**
 * Builds the effective settings from a user settings file and/or a installation settings file.
 *
 * @since 4.0.0
 */
@Experimental
public interface SettingsBuilder extends Service {

    /**
     * Builds the effective settings of the specified settings files.
     *

/**
 * Transport for specified remote repository (using provided remote repository base URI as root). Must be treated as a
 * resource, best in try-with-resource block.
 *
 * @since 4.0.0
 */
@Experimental
@Consumer
public interface Transport extends Closeable {
    /**
     * GETs the source URI content into target (does not have to exist, or will be overwritten if exist). The

import org.apache.maven.model.Model;

/**
 * Assists in the handling of model problems.
 *
 * @deprecated use {@link org.apache.maven.api.services.ModelBuilder} instead
 */
@Deprecated(since = "4.0.0")
public class ModelProblemUtils {

    /**
     * Creates a user-friendly source hint for the specified model.
     *
     * @param model The model to create a source hint for, may be {@code null}.

import org.eclipse.aether.repository.ProxySelector;
import org.eclipse.aether.repository.RemoteRepository;

/**
 * Extender that fills in legacy bits (using legacy code).
 *
 * @since 4.0.0
 */
@Named
@Singleton
public class LegacyRepositorySystemSessionExtender implements RepositorySystemSessionExtender {
    @Override
    public void extend(
            MavenExecutionRequest mavenExecutionRequest,

Se uma requisição recebida não for validada corretamente, uma resposta `400` será enviada.

## `GZipMiddleware`

Gerencia respostas GZip para qualquer requisição que inclua `"gzip"` no cabeçalho `Accept-Encoding`.

O middleware lidará com respostas padrão e de streaming.

 * {@link #DEFAULT default}, {@link #CLEAN clean}, and {@link #SITE site}, with the
 * {@code default} lifecycle being the most commonly used for project builds.
 *
 * @since 4.0.0
 */
@Experimental
@Immutable
public interface Lifecycle extends ExtensibleEnum {

    // =========================
    // Maven defined lifecycles
    // =========================
    String CLEAN = "clean";

If an incoming request does not validate correctly then a `400` response will be sent.

## `GZipMiddleware`

Handles GZip responses for any request that includes `"gzip"` in the `Accept-Encoding` header.

The middleware will handle both standard and streaming responses.

                </mxCell>
                <mxCell id="78" value="&lt;font face=&quot;Roboto&quot;&gt;&lt;span style=&quot;font-size: 24px ; font-weight: 400&quot;&gt;A Database&lt;/span&gt;&lt;/font&gt;" style="rounded=0;whiteSpace=wrap;html=1;fontStyle=1;strokeWidth=4;fillColor=#dae8fc;strokeColor=#6c8ebf;" parent="1" vertex="1">

## Version 4.0.0

_2019-06-26_

**This release upgrades OkHttp to Kotlin.** We tried our best to make fast and safe to upgrade
from OkHttp 3.x. We wrote an [upgrade guide][upgrading_to_okhttp_4] to help with the migration and a
[blog post][okhttp4_blog_post] to explain it.

 *  Fix: Target Java 8 bytecode for Java and Kotlin.


## Version 4.0.0-RC3

_2019-06-24_