}

    private static String getKey(Plugin plugin, boolean extension) {
        String version = ArtifactUtils.toSnapshotVersion(plugin.getVersion());
        return (extension ? "extension>" : "plugin>") + plugin.getGroupId() + ":" + plugin.getArtifactId() + ":"
                + version;
    }

import org.junit.jupiter.api.Assumptions.assumeTrue
import org.junit.jupiter.api.extension.AfterEachCallback
import org.junit.jupiter.api.extension.BeforeEachCallback
import org.junit.jupiter.api.extension.ExtensionContext
import org.junit.jupiter.api.extension.InvocationInterceptor
import org.junit.jupiter.api.extension.ReflectiveInvocationContext
import org.openjsse.net.ssl.OpenJSSE
import org.opentest4j.TestAbortedException

            throws ArtifactInstallationException {
        String extension = artifact.getArtifactHandler().getExtension();
        File source = new File(basedir, finalName + "." + extension);

        install(source, artifact, localRepository);
    }

    public void install(File source, Artifact artifact, ArtifactRepository localRepository)

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**

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

{* ../../docs_src/extending_openapi/tutorial001.py hl[1,4,7:9] *}

import org.junit.jupiter.api.Assertions.assertNotEquals
import org.junit.jupiter.api.BeforeEach
import org.junit.jupiter.api.Disabled
import org.junit.jupiter.api.Test
import org.junit.jupiter.api.extension.RegisterExtension

class JSSETest {
  @JvmField @RegisterExtension
  var platform = PlatformRule()

  @JvmField @RegisterExtension
  val clientTestRule = OkHttpClientTestRule()

          <defaultValue></defaultValue>
          <identifier>true</identifier>
        </field>
        <field>
          <name>extension</name>
          <version>1.1.0+</version>
          <type>String</type>
          <description>The file extension of the sub-artifact. Each classifier and extension pair may only appear once.</description>

```

If you open the automatic API docs, your extension will show up at the bottom of the specific *path operation*.

<img src="/img/tutorial/path-operation-advanced-configuration/image01.png">

And if you see the resulting OpenAPI (at `/openapi.json` in your API), you will see your extension as part of the specific *path operation* too:

```JSON hl_lines="22"
{
    "openapi": "3.1.0",

const (
	Enabled State = "Enabled"
	// Disabled  State = "Disabled" only used by MFA Delete not supported yet.
	Suspended State = "Suspended"
)

var (
	errExcludedPrefixNotSupported = Errorf("excluded prefixes extension supported only when versioning is enabled")
	errTooManyExcludedPrefixes    = Errorf("too many excluded prefixes")
)

// ExcludedPrefix - holds individual prefixes excluded from being versioned.
type ExcludedPrefix struct {

	return vc.Enabled()
}

// PrefixEnabled returns true is versioning is enabled at bucket level and if
// the given prefix doesn't match any excluded prefixes pattern. This is
// part of a MinIO versioning configuration extension.
func (sys *BucketVersioningSys) PrefixEnabled(bucket, prefix string) bool {
	vc, err := sys.Get(bucket)
	if err != nil {
		logger.CriticalIf(GlobalContext, err)
	}
	return vc.PrefixEnabled(prefix)
}

          fileSystem.source(this@asRequestBody).use { source -> sink.writeAll(source) }
        }
      }
    }

    @JvmStatic
    @Deprecated(
      message = "Moved to extension function. Put the 'content' argument first to fix Java",
      replaceWith =
        ReplaceWith(
          expression = "content.toRequestBody(contentType)",