title: Magento Debug HEADERS ALREADY SENT error
body: <p>I am receiving the following error in my system.log file:</p>
  
  <pre><code> 2011-01-12T14:16:52+00:00 DEBUG (7): HEADERS ALREADY SENT: 
   [0] C:\xampp\htdocs\www.mysite.com\app\code\core\Mage\Core\Controller\Response\Http.php:44
   [1] C:\xampp\htdocs\www.mysite.com\lib\Zend\Controller\Response\Abstract.php:727
   [2] C:\xampp\htdocs\www.mysite.com\app\code\core\Mage\Core\Controller\Response\Http.php:75
   [3] C:\xampp\htdocs\www.mysite.com\app\code\core\Mage\Core\Controller\Varien\Front.php:188
   [4] C:\xampp\htdocs\www.mysite.com\app\code\core\Mage\Core\Model\App.php:304
   [5] C:\xampp\htdocs\www.mysite.com\app\Mage.php:596
   [6] C:\xampp\htdocs\www.mysite.com\index.php:81
  </code></pre>
  
  <p>I know what "headers already sent" means but I have no idea what file is causing this and the trace doesn't really give me any information.</p>
  
  <p>Is there a way of finding out the offending file?</p>
  
  <p>Thanks!</p>