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:101:1-2021121621532631985910
	https://doi.org/10.1186/s13023-021-02024-8 STATUS : 302 → Redirecting to : https://ojrd.biomedcentral.com/articles/10.1186/s13023-021-02024-8
	https://ojrd.biomedcentral.com/articles/10.1186/s13023-021-02024-8 STATUS : 406 → Skipping : https://ojrd.biomedcentral.com/articles/10.1186/s13023-021-02024-8
	http://d-nb.info/1247807703/34 STATUS : 301 → Redirecting to : https://d-nb.info/1247807703/34
	https://d-nb.info/1247807703/34 STATUS : 404 → Skipping : https://d-nb.info/1247807703/34

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