=== ":material-language-kotlin: Kotlin"
    ```kotlin
      private val client = OkHttpClient()

      fun run() {
        val request = Request.Builder()
            .url("https://publicobject.com/helloworld.txt")
            .build()

  testImplementation(projects.mockwebserver3Junit5)
  testImplementation(libs.junit)
  testImplementation(libs.kotlin.test.common)
  testImplementation(libs.kotlin.test.junit)
  testImplementation(libs.assertk)
}

mavenPublishing {
  configure(KotlinJvm(javadocJar = JavadocJar.Empty()))
}

kotlin {
  explicitApi()

---------------

When you use Java APIs from Kotlin you can operate on Java interfaces as if they were Kotlin
lambdas. The [feature][java_sams] is available for interfaces that define a Single Abstract Method
(SAM).

But when you use Kotlin APIs from Kotlin there’s no automatic conversion. Code that used SAM lambdas
with OkHttp 3.x: must use `object :` with OkHttp 4.x:

Kotlin calling OkHttp 3.x:

```kotlin

 [jetty_8_252]: https://webtide.com/jetty-alpn-java-8u252/
 [kotlin_1_3_71]: https://github.com/JetBrains/kotlin/releases/tag/v1.3.71
 [kotlin_1_4_10]: https://github.com/JetBrains/kotlin/releases/tag/v1.4.10
 [kotlin_1_6_20]: https://github.com/JetBrains/kotlin/releases/tag/v1.6.20
 [kotlin_1_8_21]: https://github.com/JetBrains/kotlin/releases/tag/v1.8.21
 [legacy_interceptor]: https://gist.github.com/swankjesse/80135f4e03629527e723ab3bcf64be0b

 * limitations under the License.
 */
package okhttp3.internal

import java.lang.annotation.Documented
import kotlin.annotation.AnnotationRetention.BINARY
import kotlin.annotation.AnnotationTarget.CLASS
import kotlin.annotation.AnnotationTarget.CONSTRUCTOR
import kotlin.annotation.AnnotationTarget.FUNCTION

@Retention(BINARY)
@Documented
@Target(CONSTRUCTOR, CLASS, FUNCTION)

  androidTestImplementation(libs.androidx.espresso.core)
  androidTestImplementation(libs.httpClient5)
  androidTestImplementation(libs.kotlin.test.common)
  androidTestImplementation(libs.kotlin.test.junit)
  androidTestImplementation(libs.squareup.moshi)
  androidTestImplementation(libs.squareup.moshi.kotlin)
  androidTestImplementation(libs.squareup.okio.fakefilesystem)

  androidTestImplementation(libs.androidx.test.runner)

    val message1 = repeat('a', RealWebSocket.DEFAULT_MINIMUM_DEFLATE_SIZE.toInt())
    server.send(message1)
    clientListener.assertTextMessage(message1)

    // Client to server message big enough to be compressed.
    val message2 = repeat('b', RealWebSocket.DEFAULT_MINIMUM_DEFLATE_SIZE.toInt())
    client.send(message2)
    serverListener.assertTextMessage(message2)

  RecordedRequest request3 = server.takeRequest();
  assertEquals("/v1/chat/messages/3", request3.getUrl().encodedPath());

  // Shut down the server. Instances cannot be reused.
  server.close();
}
```

### Kotlin
```kotlin
fun test() {
  // Create a MockWebServer. These are lean enough that you can create a new
  // instance for every unit test.
  val server = MockWebServer()

  // Schedule some responses.

import org.gradle.api.tasks.bundling.Jar
import org.gradle.kotlin.dsl.dependencies
import org.gradle.kotlin.dsl.findByType
import org.gradle.kotlin.dsl.get
import org.gradle.kotlin.dsl.getByName
import org.gradle.kotlin.dsl.named

fun Project.applyOsgi(vararg bndProperties: String) {
  plugins.withId("org.jetbrains.kotlin.jvm") {
    applyOsgi("jar", "osgiApi", bndProperties)
  }
}

  testImplementation(projects.okhttpTestingSupport)
  testImplementation(projects.okhttpTls)
  testImplementation(libs.kotlin.test.common)
  testImplementation(libs.kotlin.test.junit)
}

mavenPublishing {
  configure(KotlinJvm(javadocJar = JavadocJar.Empty()))