$url="<URL>";
$curl = new Varien_Http_Adapter_Curl;
$curl->setConfig(array('timeout' => 15));
$curl->write(Zend_Http_Client::POST,$url, '1.1', array(), $poststring);
$result = $curl->read();
$curl->close();

$strCookie = 'PHPSESSID=' . $_COOKIE['PHPSESSID'] . '; path=/';
curl_setopt( $curl, CURLOPT_COOKIE, $strCookie );