The proxy server received an invalid
response from an upstream server.
The proxy server could not handle the request GET /dataset/dataset/activity/h12491-nos-hydrographic-survey-iocn-ny-canyon-2012-06-24.
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.