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:0001-20080307160
	http://juwel.fz-juelich.de:8080/dspace/bitstream/2128/2542/1/Informationstech_12.pdf RESTEASY004655: Unable to invoke request: java.net.UnknownHostException: juwel.fz-juelich.de
	http://d-nb.info/987855883/34 STATUS : 301 → Redirecting to : https://d-nb.info/987855883/34
	https://d-nb.info/987855883/34 STATUS : 404 → Skipping : https://d-nb.info/987855883/34

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