TYPO3 Core

Using Apache mod_rewrite in certain setups (mostly PHP in CGI mode) makes environment variables from original requests available in the target request as REDIRECT_<envvar>, thus e.g. setting TYPO3_DISABLED_CORE_UPDATER becomes REDIRECT_TYPO3_DISABLED_CORE_UPDATER.

This should be handled transparently by GeneralUtility::getIndpEnv() and relevant locations be updated (e.g. TYPO3_CONTEXT, TYPO3_DISABLE_CORE_UPDATER).