In this example we pass `Union[PlaneItem, CarItem]` as the value of the argument `response_model`.

Because we are passing it as a **value to an argument** instead of putting it in a **type annotation**, we have to use `Union` even in Python 3.10.

If it was in a type annotation we could have used the vertical bar, as:

```Python
some_variable: PlaneItem | CarItem
```

import assertk.assertions.isInstanceOf
import java.net.UnknownHostException
import okhttp3.AsyncDns
import org.junit.Test
import org.junit.runner.RunWith
import org.robolectric.RobolectricTestRunner
import org.robolectric.annotation.Config
import org.robolectric.shadow.api.Shadow

@Config(shadows = [ShadowDnsResolver::class], sdk = [34])
@RunWith(RobolectricTestRunner::class)
class AndroidAsyncDnsTest {
  @Test
  fun testDnsRequestInvalid() {

import org.jetbrains.kotlin.analysis.api.symbols.KtClassOrObjectSymbol
import org.jetbrains.kotlin.descriptors.*
import org.jetbrains.kotlin.descriptors.annotations.AnnotationUseSiteTarget
import org.jetbrains.kotlin.descriptors.annotations.KotlinTarget
import org.jetbrains.kotlin.load.java.JvmAbi
import org.jetbrains.kotlin.name.Name
import org.jetbrains.kotlin.name.SpecialNames
import org.jetbrains.kotlin.psi.KtProperty

    - Get the port list from pods definition, as well as annotations.
    - Setup iptables with required port list: `nsenter --net=<k8s pod netns> /opt/cni/bin/istio-iptables ...`. Following conditions will prevent the redirect rules to be setup in the pods:
        - Pods have annotation `sidecar.istio.io/inject` set to `false` or has no key `sidecar.istio.io/status` in annotations

This simple case is handled automatically by FastAPI because the return type annotation is the class (or a subclass) of `Response`.

And tools will also be happy because both `RedirectResponse` and `JSONResponse` are subclasses of `Response`, so the type annotation is correct.

### Annotate a Response Subclass

You can also use a subclass of `Response` in the type annotation:

```Python hl_lines="8-9"

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package mockwebserver3.junit5.internal

import okhttp3.ExperimentalOkHttpApi

@ExperimentalOkHttpApi
annotation class MockWebServerInstance(
  val name: String,

androidx-activity = "androidx.activity:activity-ktx:1.9.0"
androidx-annotation = "androidx.annotation:annotation:1.7.1"
androidx-espresso-core = "androidx.test.espresso:espresso-core:3.5.1"
androidx-junit = "androidx.test.ext:junit:1.1.5"
androidx-test-runner = "androidx.test:runner:1.5.2"
animalsniffer-annotations = "org.codehaus.mojo:animal-sniffer-annotations:1.23"

    override val descriptor: CallableDescriptor? get() = null

    override val annotationsObject: Annotations by cached {
        val bindingContext = analysisContext.analyze(psi, AnalysisMode.PARTIAL)
        Annotations.create(
            psi.annotationEntries.mapNotNull { entry ->
                bindingContext[BindingContext.ANNOTATION, entry]
            }
        )
    }

7. Here the `response_model` is using a type annotation of a list of `Author` dataclasses.

    Again, you can combine `dataclasses` with standard type annotations.

8. Notice that this *path operation function* uses regular `def` instead of `async def`.

    As always, in FastAPI you can combine `def` and `async def` as needed.

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package okhttp3.internal.platform.android

import android.annotation.SuppressLint
import android.net.ssl.SSLSockets
import android.os.Build
import java.io.IOException
import java.lang.IllegalArgumentException
import javax.net.ssl.SSLSocket
import okhttp3.Protocol