SilverStripe: How do I make HTTP Request to another website?

I am trying to make a HTTP request to another website inside a controller method. I searched for solutions but I can't find any working examples.

Here is my code:

$r = new HttpRequest('http://ift.tt/1Kts5XU', HttpRequest::METH_GET);
$r->addQueryData(array('SessionID' => $arrGetParams['SessionID']));
try {
    $r->send();
} catch (HttpException $ex) {}

I get the following error:

Fatal error: Class 'HttpRequest' not found in C:\wamp\www\abb\mysite\code\form\ALoginForm.php on line 215

How can I get this HTTP request working?

I am using SilverStripe on WAMP on a Windows 7 machine.