404. That’s an error.
The requested URL /_/+1/confirm?hl=de&url=https://kwerfeldein.de/2017/05/01/1-mai-2017/ was not found on this server. That’s all we know.
/_/+1/confirm?hl=de&url=https://kwerfeldein.de/2017/05/01/1-mai-2017/