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:hebis:04-eb2021-01035
	https://archiv.ub.uni-marburg.de/eb/2021/0103 RESTEASY004655: Unable to invoke request: org.apache.http.conn.ConnectTimeoutException: Connect to archiv.ub.uni-marburg.de:443 [archiv.ub.uni-marburg.de/137.248.186.37] failed: Read timed out

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