### Injection de dépendances

FastAPI contient un système simple mais extrêmement puissant d'<abbr title='aussi connus sous le nom de "composants", "ressources", "services", "providers"'><strong>Injection de Dépendances</strong></abbr>.

* Même les dépendances peuvent avoir des dépendances, créant une hiérarchie ou un **"graph" de dépendances**
* Tout est **automatiquement géré** par le framework

              <goal>build-bom</goal>
            </goals>
            <configuration>
              <bomClassifier>fat</bomClassifier>
              <bomName>Maven Dependencies Fat BOM</bomName>
              <bomDescription>Bill Of Materials for Apache Maven - All dependencies</bomDescription>
              <outputFilename>maven-fat-bom.xml</outputFilename>
              <reactorDependencies>REACTOR</reactorDependencies>

        "org.gradle.jvm.version": "8",
        "org.gradle.jvm.environment": "${variant.jvmEnvironment}",
        "org.gradle.libraryelements": "jar",
        "org.gradle.usage": "java-api"
      },
      "dependencies": [
        {
          "group": "com.google.guava",
          "module": "failureaccess",
          "version": {
            "requires": "1.0.3"
          }
        },
        {

     */
    enum Type {
        PROJECT,
        DEPENDENCIES,
        CHILDREN
    }

    /**
     * The phase name.
     */
    String phase();

    /**
     * The type of this pointer.
     */
    Type type();

    /**
     * The scope for dependencies, only if {@code type() == Type.Dependencies}.
     */
    String scope() default "";

                // It should have never found its way into Maven 2.x repository, but it did.
                dependencies = Collections.emptyList();
            } else {
                dependencies = rel.project.getModel().getDependencies();

                DependencyManagement depMgmt = rel.project.getModel().getDependencyManagement();

    <syntax>project.artifacts</syntax>
    <configuration>
      <![CDATA[
<dependencies>
  ...
</dependencies>
    ]]></configuration>
    <description>
      <![CDATA[
      This is a set of Artifact instances resolved from the set of dependencies for
      the current project.

      NOTE: This will likely contain much more than the direct dependencies of the

/**
 * Verifies scope inheritance of direct and transitive dependencies.
 *
 * Should show three behaviors:
 *
 * 1. dependencyManagement should override the scope of transitive dependencies.
 * 2. Direct dependencies should override the scope of dependencyManagement.
 * 3. Direct dependencies should inherit scope from dependencyManagement when
 *    they do not explicitly state a scope.
 *
 */

#    directory: "/"
#    schedule:
#      interval: "weekly"
#    groups:
#      dependencies:
#        applies-to: version-updates
#        patterns:
#          - "*"
#  - package-ecosystem: "maven"
#    directory: "/android"
#    schedule:
#      interval: "weekly"
#    groups:
#      dependencies:
#        applies-to: version-updates
#        patterns:
#          - "*"

## Dependencies { #dependencies }

FastAPI depends on Pydantic and Starlette.

### `standard` Dependencies { #standard-dependencies }

When you install FastAPI with `pip install "fastapi[standard]"` it comes with the `standard` group of optional dependencies:

Used by Pydantic:

            throws ArtifactMetadataRetrievalException {
        Set<Artifact> dependencies = new HashSet<>();

        if ("g".equals(artifact.getArtifactId())) {
            Artifact a = null;
            try {
                a = factory.createBuildArtifact("org.apache.maven", "h", "1.0", "jar");
                dependencies.add(a);
            } catch (Exception e) {