404. That’s an error.
The requested URL /_/+1/confirm?hl=en&url=http%3A%2F%2Fris.delft.nl%2Finternet%2Fgriffie_245%2F was not found on this server. That’s all we know.
/_/+1/confirm?hl=en&url=http%3A%2F%2Fris.delft.nl%2Finternet%2Fgriffie_245%2F