static public function requestIsSigned ()
	{
		if (isset($_REQUEST['oauth_signature']))
		{
			$signed = true;
		}
		else
		{
			$hs = OAuthRequestLogger::getAllHeaders();
			if (isset($hs['Authorization']) && strpos($hs['Authorization'], 'oauth_signature') !== false)
			{
				$signed = true;
			}
			else
			{
				$signed = false;
			}
		}
		return $signed;
	}