delete worksheet not working

[Khan]

so I followed the API for deleting a worksheet
 
To delete a worksheet, perform a DELETE request on the edit URL after 
obtaining it as described above.

DELETE 
https://spreadsheets.google.com/feeds/worksheets/key/private/full/worksheetId/version

 

This is my code below...however, it doesn't remove the worksheet, it just gives 
me back the worksheets feed again...

Am I missing something?...

 

bgPage.oauth.sendSignedRequest(editUrl, successCallback, {
   'parameters' : {
        'method': 'DELETE',
       'headers': {
     'GData-Version': '3.0',
          'If-Match': '*'

         }
   }
});