404. That’s an error.
The requested URL /_/+1/confirm?hl=de&url=https%3A%2F%2Fwww.drweb.de%2Fwebentwickler-front-end-checklist%2F&title=Perfekt%20f%C3%BCr%20Webentwickler%3A%20Die%20Front-End%20Checklist%20sorgt%20f%C3%BCr%20Code-Qualit%C3%A4t
was not found on this server. That’s all we know.