Drupal: “Headers already sent” error
When installing a new instance of drupal, I got the error “headers already sent.”
I also got this same error a few weeks earlier when installing “Gallery” (Gallery website)
In the case of Gallery, the issue was that I had created a new blank “config.php” page by control-clicking the gallery folder and selecting New File from the menu, forgetting that this creates a page with html headers. I didn’t notice, because I did not open the page to look at it – I simply uploaded it. Stripping out those headers solved the problem.
In the case of Drupal, it turned out it was a problem with the theme having some extra returns, although since I simply replaced it with a new copy, i was never sure exactly where the problem was. There are several forum messages that discuss this problem. In some cases it is a problem with magic quotes.
View thread 1
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View thread 3
I had a problem with the “headers already sent” too at my http://www.Maxi-Pedia.com website. In my case, it was caused by a blank line at the beginning of common.inc. Drupal or morelikely PHP seems to have problems with extra spaces here and there.
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