![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

package okhttp3.sample;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.security.GeneralSecurityException;
import java.security.KeyStore;
import java.security.SecureRandom;
import javax.net.ssl.KeyManagerFactory;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManagerFactory;
import okhttp3.mockwebserver.Dispatcher;

@font-face {
    font-family: cash-market;
    src: url("https://cash-f.squarecdn.com/static/fonts/cash-market/v2/CashMarket-Regular.woff2") format("woff2");
    font-weight: 400;
    font-style: normal
}

@font-face {
    font-family: cash-market;
    src: url("https://cash-f.squarecdn.com/static/fonts/cash-market/v2/CashMarket-Medium.woff2") format("woff2");
    font-weight: 500;
    font-style: normal
}

@font-face {
    font-family: cash-market;

 * it easy to get sample values to use in such tests.
 *
 * This class is pretty fast and loose with default values: it attempts to provide values that are
 * well-formed, but doesn't guarantee values are internally consistent. Callers must take care to
 * configure the factory when sample values impact the correctness of the test.
 */
class TestValueFactory : Closeable {

}

graal {
  mainClass("okhttp3.curl.MainCommandLineKt")
  outputName("okcurl")
  graalVersion(libs.versions.graalvm.get())
  javaVersion("11")

  option("--no-fallback")

  if (Os.isFamily(Os.FAMILY_WINDOWS)) {
    // May be possible without, but autodetection is problematic on Windows 10
    // see https://github.com/palantir/gradle-graal
    // see https://www.graalvm.org/docs/reference-manual/native-image/#prerequisites

    val certificatePinner =
      CertificatePinner.Builder()
        .add("**.example.com", certA1Sha256Pin)
        .build()

    assertThat(certificatePinner.findMatchingPins("xample.com")).isEmpty()
    assertThat(certificatePinner.findMatchingPins("dexample.com")).isEmpty()
    assertThat(certificatePinner.findMatchingPins("barnexample.com")).isEmpty()
  }

      .build()
  }

  fun buildCleanBrowsing(bootstrapClient: OkHttpClient): DnsOverHttps {
    return DnsOverHttps.Builder()
      .client(bootstrapClient)
      .url("https://doh.cleanbrowsing.org/doh/family-filter/".toHttpUrl())
      .includeIPv6(false)
      .build()
  }

  private fun buildChantra(bootstrapClient: OkHttpClient): DnsOverHttps {
    return DnsOverHttps.Builder()
      .client(bootstrapClient)

 * 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.sample;

import java.io.File;
import java.io.IOException;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

plugins {
  kotlin("jvm")
  application
}

application {
  mainClass.set("okhttp3.sample.Crawler")
}

dependencies {
  implementation(projects.okhttp)
  implementation(libs.jsoup)
}

tasks.compileJava {
  options.isWarnings = false

 * 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.sample;

import com.squareup.moshi.JsonAdapter;
import com.squareup.moshi.Moshi;
import com.squareup.moshi.Types;
import java.util.Collections;
import java.util.List;
import okhttp3.OkHttpClient;
import okhttp3.Request;