We see that we are going to need some dependencies used in several places of the application.

So we put them in their own `dependencies` module (`app/dependencies.py`).

We will now use a simple dependency to read a custom `X-Token` header:

{* ../../docs_src/bigger_applications/app_an_py39/dependencies.py hl[3,6:8] title["app/dependencies.py"] *}

/// tip

We are using an invented header to simplify this example.

  xsi:schemaLocation="http://maven.apache.org/METADATA/1.1.0 http://maven.apache.org/xsd/metadata-1.1.0.xsd">
  <groupId>ut.simple</groupId>
  <artifactId>dependency</artifactId>
  <versioning>
    <latest>1.0</latest>
    <release>1.0</release>
    <versions>
      <version>1.0</version>
    </versions>
    <lastUpdated>20111123122038</lastUpdated>
  </versioning>

        if (result.hasMetadataResolutionExceptions()) {
            throw result.getMetadataResolutionException(0);
        }

        // Metadata cannot be retrieved

        // Cyclic Dependency Error

        if (result.hasCircularDependencyExceptions()) {
            throw result.getCircularDependencyException(0);
        }

        // Version Range Violation

 * assist those clients that employ the repository system outside of an IoC container, Maven plugins should instead
 * always use regular dependency injection to acquire the repository system.
 *
 * @deprecated See {@link MavenSessionBuilderSupplier}
 */
@Deprecated
public final class MavenRepositorySystemUtils {

    private MavenRepositorySystemUtils() {

            }

            target.setReportSets(new ArrayList<>(merged.values()));
        }
    }

    @Override
    protected Object getDependencyKey(Dependency dependency) {
        return dependency.getManagementKey();
    }

    @Override
    protected Object getPluginKey(Plugin plugin) {
        return plugin.getKey();
    }

    @Override

_2020-07-11_

 *  New: Change `HeldCertificate.Builder` to use its own ASN.1 certificate encoder. This is part
    of our effort to remove the okhttp-tls module's dependency on Bouncy Castle. We think Bouncy
    Castle is great! But it's a large dependency (6.5 MiB) and its security provider feature
    impacts VM-wide behavior.

 *  New: Reduce contention for applications that make a very high number of concurrent requests.

        default Type type() {
            return Type.PROJECT;
        }
    }

    interface DependenciesPointer extends Pointer {
        /**
         * Returns the dependency scope this pointer applies to.
         *
         * @return the dependency scope, or "all" if not specified
         */
        String scope(); // default: all

        /**

     *
     * @param request The resolution request holding the parameters, must not be {@code null}.
     * @return The resolution result, never {@code null}.
     * @throws DependencyResolutionException If any project dependency could not be resolved.
     */
    DependencyResolutionResult resolve(DependencyResolutionRequest request) throws DependencyResolutionException;

   * The version string is configured in the root project's `build.gradle`.
   *
   * Note that OkHttp's runtime version may be different from the version specified in your
   * project's build file due to the dependency resolution features of your build tool.
   *
   * [semver]: https://semver.org
   */
  val VERSION: String

    @get:Input
    val name: Provider<String> = homeDir.asFile.map { it.parentFile.parentFile.name }

    /**
     * Make sure this stays type FileCollection (lazy) to avoid losing dependency information.
     */
    @get:InputFiles
    @get:PathSensitive(PathSensitivity.RELATIVE)
    val staticContent: FileCollection
        get() = homeDir.asFileTree.matching {
            exclude("lib/**")