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:bsz:21-dt-95003
	http://idb.ub.uni-tuebingen.de/opendigi/kup_13 STATUS : 301 → Redirecting to : https://opendigi.ub.uni-tuebingen.de/opendigi/kup_13
	https://opendigi.ub.uni-tuebingen.de/opendigi/kup_13 STATUS : 500 → Server error during contacting : https://opendigi.ub.uni-tuebingen.de/opendigi/kup_13

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