The proxy server received an invalid
response from an upstream server.
The proxy server could not handle the request GET /dataset/dataset/h12851-nos-hydrographic-survey-2016-10-14/resource/1d7949c2-35fb-43b9-a7c0-93bbac2825e2.
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.