code: protected function fetch($url, $encoding)
      {
          $request = $this->createRequest($url, $encoding);
  
          return $request->fetch($this->connection_timeout);
      }
docs: Actually make the web request.
  
  @param SimpleUrl $url                   Target to fetch.
  @param SimpleFormEncoding $encoding     Additional parameters for request.
  
  @return SimpleHttpResponse              Headers and hopefully content.