The proxy server received an invalid
response from an upstream server.
The proxy server could not handle the request GET /dataset/dataset/h12537-nos-hydrographic-survey-chatham-strait-ak-2013-06-19/resource/2edb3710-6990-4bdb-b3b3-cd6234a04001.
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.