We have an app to generate a google spreadsheet from the app. However, we 
are getting this "No authentication header information" - this is error log 
which means when the the app tries to update/create google sheets this 
error log splits. we use google sheets api v3 and our program code is

SpreadsheetFeed feed = service.getFeed(new URL("
https://spreadsheets.google.com/feeds/spreadsheets/private/full";), 
SpreadsheetFeed.class);SpreadsheetFeed 
feed = service.getFeed(new URL("
https://spreadsheets.google.com/feeds/spreadsheets/private/full";),
 SpreadsheetFeed.class);

we are facing issue here. service is object of SpreadsheetService. and here 
we are getting java.lang.NullPointerException: No authentication header 
informationjava.lang.NullPointerException: No authentication header 
information.

Please review above and advise?

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