TYPO3 v15 dev-main snapshot ()

2026-08-10 22:31:09 +02:00
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+..  include:: /Includes.rst.txt
+
+..  _breaking-107943-1761860828:
+
+==========================================================================
+Breaking: #107943 - Frontend and backend HTTP response compression removed
+==========================================================================
+
+See :issue:`107943`
+
+Description
+===========
+
+The TYPO3 frontend and backend applications previously allowed compressing
+their HTTP responses using the configuration options
+:php:`$GLOBALS['TYPO3_CONF_VARS']['FE']['compressionLevel']` and
+:php:`$GLOBALS['TYPO3_CONF_VARS']['BE']['compressionLevel']`.
+
+This feature, which was always disabled by default, has now been removed.
+
+TYPO3 will no longer compress its HTTP responses itself.
+
+Response compression should be handled by the web server rather than the
+application layer.
+
+Removing this feature avoids potential conflicts when both TYPO3 and the web
+server attempt to compress responses and allows modern web servers to use
+advanced compression algorithms such as brotli or zStandard when supported by
+the client.
+
+Impact
+======
+
+TYPO3 can no longer compress its HTTP responses.
+
+This responsibility is now fully delegated to the web server.
+
+HTTP response compression had to be explicitly enabled before, so most
+installations will not notice a change unless they relied on this setting.
+
+Affected installations
+======================
+
+Instances that configured
+:php:`$GLOBALS['TYPO3_CONF_VARS']['FE']['compressionLevel']` or
+:php:`$GLOBALS['TYPO3_CONF_VARS']['BE']['compressionLevel']` to non-zero values
+are affected.
+
+Administrators should verify that the web server applies HTTP compression by
+checking for a response header such as:
+
+:code:`Content-Encoding: gzip`
+
+when requesting frontend or backend documents with a header like:
+
+:code:`Accept-Encoding: gzip, deflate`
+
+All commonly used web servers enable this feature by default.
+
+Migration
+=========
+
+The configuration toggles for the backend :php:`$GLOBALS['TYPO3_CONF_VARS']['BE']['compressionLevel']`
+and the frontend :php:`$GLOBALS['TYPO3_CONF_VARS']['FE']['compressionLevel']` are
+obsolete, existing settings in :file:`settings.php` configuration files are
+actively removed when first using the install tool after upgrade to TYPO3 v14.
+
+..  index:: Backend, Frontend, LocalConfiguration, NotScanned, ext:core