code: public WebhookClientBuilder setHttpClientBuilder(@Nullable OkHttpClient.Builder builder)
      {
          Checks.notNull(builder, "Builder");
          this.builder = builder;
          return this;
      }
docs: The {@link okhttp3.OkHttpClient.Builder OkHttpClient.Builder}
  that should be used to create the {@link okhttp3.OkHttpClient OkHttpClient} of the resulting {@link net.dv8tion.jda.webhook.WebhookClient WebhookClient}!
  <br>If not set or {@code null} this builder will use the {@link #DEFAULT_HTTP_BUILDER} instance.
  
  <p>This setting is ignored if {@link #setHttpClient(okhttp3.OkHttpClient)} is set!
  
  @param  builder
  The builder that should be used
  
  @return The current WebhookClientBuilder for chaining convenience