isFinalFrame = b0 and B0_FLAG_FIN != 0
    isControlFrame = b0 and OPCODE_FLAG_CONTROL != 0

    // Control frames must be final frames (cannot contain continuations).
    if (isControlFrame && !isFinalFrame) {
      throw ProtocolException("Control frames must be final.")
    }

    val reservedFlag1 = b0 and B0_FLAG_RSV1 != 0
    when (opcode) {
      OPCODE_TEXT, OPCODE_BINARY -> {

            println(CertificatePinner.pin(certificate))
          }
        }
      }
    ```
=== ":material-language-java: Java"
    ```java
      private final OkHttpClient client = new OkHttpClient.Builder()
          .certificatePinner(
              new CertificatePinner.Builder()
                  .add("publicobject.com", "sha256/afwiKY3RxoMmLkuRW1l7QsPZTJPwDS2pdDROQjXw8ig=")

public final class okhttp3/tls/Certificates {
	public static final fun certificatePem (Ljava/security/cert/X509Certificate;)Ljava/lang/String;
	public static final fun decodeCertificatePem (Ljava/lang/String;)Ljava/security/cert/X509Certificate;
}

public final class okhttp3/tls/HandshakeCertificates {
	public final fun -deprecated_keyManager ()Ljavax/net/ssl/X509KeyManager;
	public final fun -deprecated_trustManager ()Ljavax/net/ssl/X509TrustManager;

	public fun intercept (Lokhttp3/Interceptor$Chain;)Lokhttp3/Response;
	public final fun level (Lokhttp3/logging/HttpLoggingInterceptor$Level;)V
	public final fun redactHeader (Ljava/lang/String;)V
	public final fun redactQueryParams ([Ljava/lang/String;)V
	public final fun setLevel (Lokhttp3/logging/HttpLoggingInterceptor$Level;)Lokhttp3/logging/HttpLoggingInterceptor;
}

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

public final class ParseResponseWithMoshi {
  private final OkHttpClient client = new OkHttpClient();
  private final Moshi moshi = new Moshi.Builder().build();
  private final JsonAdapter<Gist> gistJsonAdapter = moshi.adapter(Gist.class);

  public void run() throws Exception {
    Request request = new Request.Builder()

       * these examples, please request your own client ID! https://api.imgur.com/oauth2
       */
      private static final String IMGUR_CLIENT_ID = "...";
      private static final MediaType MEDIA_TYPE_PNG = MediaType.parse("image/png");

      private final OkHttpClient client = new OkHttpClient();

      public void run() throws Exception {

import okhttp3.MediaType;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

public final class PostString {
  public static final MediaType MEDIA_TYPE_MARKDOWN
      = MediaType.get("text/x-markdown; charset=utf-8");

  private final OkHttpClient client = new OkHttpClient();

  public void run() throws Exception {
    String postBody = ""
        + "Releases\n"

public final class okhttp3/coroutines/ExecuteAsyncKt {
	public static final fun executeAsync (Lokhttp3/Call;Lkotlin/coroutines/Continuation;)Ljava/lang/Object;

package okhttp3.recipes;

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

public final class PostForm {
  private final OkHttpClient client = new OkHttpClient();

  public void run() throws Exception {
    RequestBody formBody = new FormBody.Builder()
        .add("search", "Jurassic Park")
        .build();

import java.io.IOException;
import java.util.Date;
import okhttp3.Headers;
import okhttp3.Interceptor;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

public final class CurrentDateHeader {
  private final OkHttpClient client = new OkHttpClient.Builder()
      .addInterceptor(new CurrentDateInterceptor())
      .build();

  public void run() throws Exception {
    Request request = new Request.Builder()