code: public final HttpClient doOnResponse(BiConsumer<? super HttpClientResponse, ? super Connection> doOnResponse) {
  		Objects.requireNonNull(doOnResponse, "doOnResponse");
  		return new HttpClientDoOn(this, null, null, doOnResponse, null);
  	}
docs: Setup a callback called after {@link HttpClientResponse} headers have been
  received
  
  @param doOnResponse a consumer observing connected events
  
  @return a new {@link HttpClient}