With this function, the resolver checks all associated URLs and marks them either with a green tick or, in the event of an error, with a red cross. Users are redirected to the first URL marked in green.

Analyse	urn:nbn:de:101:1-2019121113003745710126
	https://vr-elibrary.de/doi/pdf/10.13109/path.2008.97.1.30 STATUS : 403 → Skipping : https://vr-elibrary.de/doi/pdf/10.13109/path.2008.97.1.30
	http://d-nb.info/1201442230/34 STATUS : 301 → Redirecting to : https://d-nb.info/1201442230/34
	https://d-nb.info/1201442230/34 STATUS : 404 → Skipping : https://d-nb.info/1201442230/34

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