Internal Server Error The server was unable to complete your request. If this happens again, please send the technical details below to the server administrator. More details can be found in the server log

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Solved this error, it’s due to trailing / on proxy pass thanks to this posts : Requested uri (/cloud/remote.phpp/dav/files/mburchard/) is out of base uri (/cloud/remote.php/dav/) · Issue #20707 · nextcloud/server · GitHub && Nextcloud behind Apache reverse proxy, remote.php becomes remote.phpp - #2 by skjaeve