code: protected function loadPage($url, $parameters)
      {
          $this->page = $this->fetch($url, $parameters);
          $this->history->recordEntry(
                  $this->page->getUrl(),
                  $this->page->getRequestData());
  
          return $this->page->getRaw();
      }
docs: Fetches a page and makes it the current page/frame.
  
  @param string/SimpleUrl $url            Target to fetch as string.
  @param SimplePostEncoding $parameters   POST parameters.
  
  @return string                          Raw content of page.