The proxy server received an invalid
response from an upstream server.
The proxy server could not handle the request GET /dataset/dataset/h12848-nos-hydrographic-survey-2016-06-29/resource/53768bf7-afb2-4d0d-9bd2-a7a0acb334db.
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.