404. That’s an error.
The requested URL /_/+1/confirm?hl=de&url=http%3A%2F%2Fwww.deutschlandfunk.de%2Fkunst-der-oberflaeche-ein-symposium-der-komischen-oper.691.de.html%3Fdram%3Aarticle_id%3D310618&title=Ein%20Symposium%20der%20Komischen%20Oper%20Berlin%20%C3%BCber%20den%20neuen%20Erfolg%20der%20Operette%20
was not found on this server. That’s all we know.