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

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

        client.newCall(request).execute().use { response ->
          if (!response.isSuccessful) throw IOException("Unexpected code $response")

		return msgBuilder.String(), err
	}

	if err := conn.HandshakeContext(ctx); err != nil {
		return "", err
	}
	// Make sure the client writes something to the buffer
	message := "HelloWorld"
	if cfg.Request.Message != "" {
		message = cfg.Request.Message
	}

	start := time.Now()
	if _, err := conn.Write([]byte(message + "\n")); err != nil {
		fwLog.Warnf("TCP write failed: %v", err)

		return msgBuilder.String(), err
	}
	if err := conn.SetReadDeadline(deadline); err != nil {
		return msgBuilder.String(), err
	}

	// Make sure the client writes something to the buffer
	message := "HelloWorld"
	if cfg.Request.Message != "" {
		message = cfg.Request.Message
	}

	if _, err := conn.Write([]byte(message + "\n")); err != nil {
		fwLog.Warnf("UDP write failed: %v", err)
		return msgBuilder.String(), err
	}

			Name:      "service",
			Namespace: "ns",
		},
		Spec: v1.ServiceSpec{
			Ports: []v1.ServicePort{{
				Name: "http",
				Port: 80,
			}},
			Selector:  map[string]string{"app": "helloworld"},
			ClusterIP: "9.9.9.9",
		},
	}

	if nodeSelector != "" {
		svc.Annotations = map[string]string{
			"traffic.istio.io/nodeSelector": nodeSelector,
		}
	}
	return svc
}

          name: istio-ca-root-cert
        name: istiod-ca-cert
  test: false
  triggers:
  - type: ConfigChange
  - imageChangeParams:
      automatic: true
      containerNames:
      - helloworld
      from:
        kind: ImageStreamTag
        name: hello-go-gke:1.0
    type: ImageChange
status:
  availableReplicas: 0
  latestVersion: 0
  observedGeneration: 0
  replicas: 0

          name: istio-ca-root-cert
        name: istiod-ca-cert
  test: false
  triggers:
  - type: ConfigChange
  - imageChangeParams:
      automatic: true
      containerNames:
      - helloworld
      from:
        kind: ImageStreamTag
        name: hello-go-gke:1.0
    type: ImageChange
status:
  availableReplicas: 0
  latestVersion: 0
  observedGeneration: 0
  replicas: 0

            .sslSocketFactory(sslSocketFactory, trustManager)
            .build()
      }

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

        client.newCall(request).execute().use { response ->
          if (!response.isSuccessful) throw IOException("Unexpected code $response")

 * directive:
 *
 * ```java
 * Request request = new Request.Builder()
 *     .cacheControl(new CacheControl.Builder().noCache().build())
 *     .url("http://publicobject.com/helloworld.txt")
 *     .build();
 * ```
 *
 * If it is only necessary to force a cached response to be validated by the server, use the more
 * efficient `max-age=0` directive instead:
 *
 * ```java

		})
	}
}

func TestValidRegion(t *testing.T) {
	tests := []struct {
		name    string
		success bool
	}{
		{name: "us-east-1", success: true},
		{name: "us_east", success: true},
		{name: "helloWorld", success: true},
		{name: "-fdslka", success: false},
		{name: "^00[", success: false},
		{name: "my region", success: false},
		{name: "%%$#!", success: false},
	}

	for _, test := range tests {

        .sslSocketFactory(certificates.sslSocketFactory(), certificates.trustManager)
        .build()
  }

  fun run() {
    showUrl("https://squareup.com/robots.txt")
    showUrl("https://publicobject.com/helloworld.txt")
  }

  private fun showUrl(url: String) {
    val request = Builder().url(url).build()
    client.newCall(request)
      .execute()
      .use { response ->
        if (!response.isSuccessful) {