The proxy server received an invalid
response from an upstream server.
The proxy server could not handle the request GET /dataset/dataset/h11872-nos-hydrographic-survey-mid-atlantic-corridor-maryland-2008-12-19/resource/254ccb3a-a464-4ad5-947b-3550dcd5236e.
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.