user_agent.php
protected function fetch($url, $encoding)
    {
        $request = $this->createRequest($url, $encoding);

        return $request->fetch($this->connection_timeout);
    }
protected function fetch($url, $encoding)
    {
        $request = $this->createRequest($url, $encoding);

        return $request->fetch($this->connection_timeout);
    }
Actually make the web request.

@param SimpleUrl $url                   Target to fetch.
@param SimpleFormEncoding $encoding     Additional parameters for request.

@return SimpleHttpResponse              Headers and hopefully content.