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:101:1-2020022612345208973986
	http://d-nb.info/1205399720/34 STATUS : 301 → Redirecting to : https://d-nb.info/1205399720/34
	https://d-nb.info/1205399720/34 STATUS : 500 → Server error during contacting : https://d-nb.info/1205399720/34

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