The proxy server received an invalid
response from an upstream server.
The proxy server could not handle the request GET /dataset/dataset/h10472-nos-hydrographic-survey-approaches-to-port-isabel-texas-1993-09-02/resource/336afbb3-86ee-446b-8f6c-84977c84f7f2.
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.