A url with uppercase letters or umlauts is forwarded to the lowercase URL with ae, oe, ue, ss replacements
TYPO3 Extension: Transform a URL to lowerCase and redirect to the new URL
Install with ExtensionManager or with
composer require svenjuergens/miniredirect
As an administrator, you can enable logging, go to "Settings" -> "Extension Configuration" and mark the checkbox "Use Logging".
Then you will find your own logfile under