code: public LineMessagingClientBuilder okHttpClientBuilder(
              @NonNull final OkHttpClient.Builder okHttpClientBuilder,
              final boolean addAuthenticationHeader) {
          this.okHttpClientBuilder = okHttpClientBuilder;
          this.addAuthenticationHeader = addAuthenticationHeader;
  
          return this;
      }
docs: Set customized OkHttpClient.Builder.
  
  <p>In case of you need your own customized {@link OkHttpClient},
  this builder allows specify {@link OkHttpClient.Builder} instance.
  
  <p>To use this method, please add dependency to 'com.squareup.retrofit2:retrofit'.
  
  @param addAuthenticationHeader If true, all default okhttp interceptors ignored.
  You should insert authentication headers yourself.