Magento Debug HEADERS ALREADY SENT error

Question

I am receiving the following error in my system.log file:

 2011-01-12T14:16:52+00:00 DEBUG (7): HEADERS ALREADY SENT: 
 [0] C:\\xampp\\htdocs\\www.mysite.com         


        

Answer 1

Maybe it will be helpful for someone: I get similar message when I turn on Magento's WYSIWYG when editing pages in CMS -> Pages (I've got WYSIWYG disabled by default so I have to click "Show/Hide Editor" in order to enable it). If page contains CMS tags such as for example:

{{store url='my-other-page'}}

this message apears in the system.log after I click "Show/Hide Editor":

2013-04-06T11:10:38+00:00 DEBUG (7): HEADERS ALREADY SENT: 
[0] ...\app\code\core\Mage\Core\Controller\Response\Http.php:52
[1] ...\lib\Zend\Controller\Response\Abstract.php:766
[2] ...\app\code\core\Mage\Core\Controller\Response\Http.php:83
[3] ...\app\code\core\Mage\Core\Controller\Varien\Front.php:188
[4] ...\app\code\core\Mage\Core\Model\App.php:354
[5] ...\app\Mage.php:683
[6] ...\index.php:87