TYPO3 Core

$TYPO3_CONF_VARS['SYS']['reverseProxyHeaderMultiValue'] = 'first';

This returns a php error. To shift the first (bottom) element from an array array_shift() instead of array_unshift() should be used.

This was introduced by #18126, that has been commited to 4.2-branch.

Beside this small nobrainer the reverse Proxy config in 4.2 works great for me! Many Thanks!
(issue imported from #M7843)