Proxy Error

The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET /dataset/dataset/h05173-nos-hydrographic-survey-1931-12-31/resource/5317c853-9668-4875-bb7d-7ec9781094b5.

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.