init.php

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<?php
define('TYPO3_MODE', 'BE');

require __DIR__ . '/sysext/core/Classes/Core/Bootstrap.php';

\TYPO3\CMS\Core\Core\Bootstrap::getInstance()
    ->baseSetup('typo3/')
    ->redirectToInstallerIfEssentialConfigurationDoesNotExist('../')
    ->startOutputBuffering()
    ->loadConfigurationAndInitialize()
    ->loadTypo3LoadedExtAndExtLocalconf(TRUE)
    ->applyAdditionalConfigurationSettings()
    ->initializeTypo3DbGlobal()
    ->checkLockedBackendAndRedirectOrDie()
    ->checkBackendIpOrDie()
    ->checkSslBackendAndRedirectIfNeeded()
    ->checkValidBrowserOrDie()
    ->loadExtensionTables(TRUE)
    ->initializeSpriteManager()
    ->initializeBackendUser()
    ->initializeBackendAuthentication()
    ->initializeBackendUserMounts()
    ->initializeLanguageObject()
    ->initializeBackendTemplate()
    ->endOutputBufferingAndCleanPreviousOutput()
    ->initializeOutputCompression()
    ->sendHttpHeaders();