The proxy server received an invalid
response from an upstream server.
The proxy server could not handle the request GET /dataset/dataset/h10188a-nos-hydrographic-survey-togiak-bay-alaska-1985-08-05/resource/ff88d6f3-1dbe-430d-b8ae-ed08f5f3f919.
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.