The proxy server received an invalid
response from an upstream server.
The proxy server could not handle the request GET /dataset/dataset/sverdrup-20180509t1742/resource/3ee84c61-e8c4-4e8d-b46f-b0a5b2e5ed25.
Reason: DNS lookup failure for: os-data-catalog.ngdc.noaa.gov
Additionally, a 502 Bad Gateway error was encountered while trying to use an ErrorDocument to handle the request.