[TYPO3-core] RFC: #7843: $TYPO3_CONF_VARS['SYS']['reverseProxyHeaderMultiValue'] = 'first'; returns php error

[Christian Kuhn]

This is an SVN patch request.

Type: Bugfix, nobrainer

Branch: TYPO3_4-2

Bugtracker references:
http://bugs.typo3.org/view.php?id=7843

Problem:
The new HTTP_X_FORWARDED_FOR feature from #7397 (commited to 4.2-branch) 
returns a php error if 
$TYPO3_CONF_VARS['SYS']['reverseProxyHeaderMultiValue'] = 'first'; is used.

Solution:
To shift first (bottom) element from an array, array_shift() instead of 
array_unshift() should be used.

Notes:
Beside this issue my reverse proxy setup works with 4.2. Great patch!

Thanks
Christian
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