code: protected org.apache.http.impl.client.HttpClientBuilder customizeBuilder(
          org.apache.http.impl.client.HttpClientBuilder builder
      ) {
          return builder;
      }
docs: Configures an Apache {@link org.apache.http.impl.client.HttpClientBuilder HttpClientBuilder}.
  
  Intended for use by subclasses to inject HttpClientBuilder
  configuration. The default implementation is an identity
  function.