![Events Diagram](../assets/images/******@****.***)

Here’s a [sample event listener](https://github.com/square/okhttp/blob/master/samples/guide/src/main/java/okhttp3/recipes/PrintEventsNonConcurrent.java) that prints each event with a timestamp.

```java
class PrintingEventListener extends EventListener {
  private long callStartNanos;

private val prefix = if (File("samples").exists()) "" else "../../"

private fun mainFiles(): List<File> {
  val directories =
    listOf(
      "$prefix/samples/guide/src/main/java/okhttp3/guide",
      "$prefix/samples/guide/src/main/java/okhttp3/recipes",
      "$prefix/samples/guide/src/main/java/okhttp3/recipes/kt",
    ).map { File(it) }

  return directories.flatMap {
    it.listFiles().orEmpty().filter { f -> f.isFile }.toList()
  }
}

 [changelog]: https://square.github.io/okhttp/changelog/
 [conscrypt]: https://github.com/google/conscrypt/
 [get_example]: https://raw.github.com/square/okhttp/master/samples/guide/src/main/java/okhttp3/guide/GetExample.java
 [kotlin]: https://kotlinlang.org/
 [okhttp3_pro]: https://raw.githubusercontent.com/square/okhttp/master/okhttp/src/main/resources/META-INF/proguard/okhttp3.pro

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package okhttp3.guide;

import java.io.IOException;
import okhttp3.MediaType;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

public class PostExample {

[Twitter][twitter_coc], [Ubuntu][ubuntu_coc], [GDC][gdc_coc], and [Django][django_coc] communities.
We are thankful for their work.

Reporting Guide
---------------

If you experience or witness unacceptable behavior — or have any other concerns — please report it by
emailing [******@****.***][codeofconduct_at]. All reports will be handled with
discretion.

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package okhttp3.guide;

import java.io.IOException;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

public class GetExample {
  final OkHttpClient client = new OkHttpClient();

include(":okhttp-logging-interceptor")
include(":okhttp-sse")
include(":okhttp-testing-support")
include(":okhttp-tls")
include(":okhttp-urlconnection")
include(":samples:compare")
include(":samples:crawler")
include(":samples:guide")
include(":samples:simple-client")
include(":samples:slack")
include(":samples:static-server")
include(":samples:tlssurvey")
include(":samples:unixdomainsockets")
include(":container-tests")

    platform.assumeJdk9()
  }

  @Test
  fun testTlsv13Works() {
    // https://docs.oracle.com/en/java/javase/14/security/java-secure-socket-extension-jsse-reference-guide.html
    // TODO test jdk.tls.client.enableSessionTicketExtension
    // TODO check debugging information

    enableTls()

    server.enqueue(MockResponse(body = "abc"))

    val request = Request(server.url("/"))