diff -r typo3_src-4.1/typo3/sysext/cms/tslib/class.tslib_fe.php /var/www/typo3_src-4.1/typo3/sysext/cms/tslib/class.tslib_fe.php
2980a2981,2986
> 			if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])){
> 				if ((strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE'])!= -1) && ($this->register['SYS_LASTCHANGED'] <= strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']))){
> 					header('HTTP/1.1 304 Not Modified');
> 					die;
> 				}
> 			}