The proxy server received an invalid
response from an upstream server.
The proxy server could not handle the request GET /dataset/dataset/sg668-20190819t12172/resource/8906afd2-75cf-4f07-9f16-0ac6ffdb4751.
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.