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:101:1-2019031822423140573182
	https://doi.org/10.1038/s41598-019-39178-2 RESTEASY004655: Unable to invoke request: java.net.SocketTimeoutException: Read timed out
	http://d-nb.info/1181081335/34 STATUS : 301 → Redirecting to : https://d-nb.info/1181081335/34
	https://d-nb.info/1181081335/34 STATUS : 404 → Skipping : https://d-nb.info/1181081335/34

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