The proxy server received an invalid
response from an upstream server.
The proxy server could not handle the request GET /dataset/dataset/h12887-nos-hydrographic-survey-2016-09-30/resource/4bbe8a08-345f-4e2b-9eca-1eda7f12060a.
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.