[TYPO3-core] RFC #17471: Status "500 Internal Server Error" returned, if page is not found

[Steffen Gebert]

Hi!

This is a SVN patch request.

Type: Bugfix

Bugtracker reference:
http://bugs.typo3.org/view.php?id=17471

Branches:
trunk, 4-5

Problem:
Due to the ExceptionHandler, no status 404 is returned, if a page is not 
found, but status 500 instead.
This happens with and without RealURL (only the message differs)

Solution:
Check in the Exception Handler, whether a status code has already been sent.

Note:
This change was also pushed to gerrit. You may try to review it there, 
too: https://review.typo3.org/828

Kind regards
Steffen

-- 
Steffen Gebert
TYPO3 Core Team Member
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