* <p>
 * It provides information about the file type (or extension) of the associated artifact,
 * its default classifier, and how the artifact will be used in the build when creating
 * class paths or module paths.
 * <p>
 * For example, the type {@code java-source} has a {@code jar} extension and a
 * {@code sources} classifier. The artifact and its dependencies should be added
 * to the build path.

        ),
      )
  }

  @Test
  fun multiplePerMessageDeflateHeaders() {
    val extensions =
      WebSocketExtensions.parse(
        headersOf(
          "Sec-WebSocket-Extensions",
          "",
          "Sec-WebSocket-Extensions",
          "permessage-deflate",
        ),
      )
    assertThat(extensions)
      .isEqualTo(
        WebSocketExtensions(
          perMessageDeflate = true,
        ),

    <snapshotVersions>
      <snapshotVersion>
        <classifier>classifierA</classifier>
        <extension>jar</extension>
        <value>07.20.3-20120809.112124-88</value>
        <updated>20120809112124</updated>
      </snapshotVersion>
      <snapshotVersion>
        <classifier>classifierB</classifier>
        <extension>jar</extension>
        <value>07.20.3-20120809.112920-97</value>
        <updated>20120809112920</updated>

import assertk.assertThat
import assertk.assertions.hasMessage
import kotlin.test.assertFailsWith
import org.junit.jupiter.api.Test
import org.junit.jupiter.api.extension.BeforeEachCallback
import org.junit.jupiter.api.extension.ExtensionContext
import org.junit.jupiter.api.extension.RegisterExtension

class OkHttpClientTestRuleTest {
  lateinit var extensionContext: ExtensionContext

  @RegisterExtension @JvmField

                ArtifactHandler handler =
                        container.lookup(ArtifactHandlerManager.class).getArtifactHandler(type);
                assertEquals(handler.getExtension(), extension, type + " extension");
                // Packaging/Directory is Maven1 remnant!!!
                // assertEquals(handler.getPackaging(), packaging, type + " packaging");

                }
            }
        }

        private void visit(Extension extension) {
            if (extension != null) {
                String org, val;
                // GroupId
                org = extension.getGroupId();
                val = interpolate(org);
                if (org != val) {
                    extension.setGroupId(val);
                }
                // ArtifactId

For example, let's add <a href="https://github.com/Rebilly/ReDoc/blob/master/docs/redoc-vendor-extensions.md#x-logo" class="external-link" target="_blank">ReDoc's OpenAPI extension to include a custom logo</a>.

### Normal **FastAPI** { #normal-fastapi }

First, write all your **FastAPI** application as normally:

import org.apache.maven.api.xml.XmlService;

/**
 * Creates an extension descriptor from some XML stream.
 *
 */
public class ExtensionDescriptorBuilder {

    /**
     * @since 3.3.0
     */
    public String getExtensionDescriptorLocation() {
        return "META-INF/maven/extension.xml";
    }

    /**
     * Extracts the extension descriptor (if any) from the specified JAR file.
     *

      <item name="Source Xref" href="xref/index.html"/>
      <!--item name="FAQ" href="faq.html"/-->
    </menu>

    <menu name="Reference">
      <item name="Core Extensions" href="core-extensions.html"/>
      <item name="Extension Descriptor" href="extension.html"/>
    </menu>
  </body>

 * information among plugins, is this more like an extension point - do we need a sort of bus for
 * application data - do we need a dictionary for our applications like Apple does. We could easily
 * hook into this and this is the model we need to follow - how many of our REST services do not map
 * directory to a method in the application interface?
 *
 * - research extension points versus plugins
 *