# File lib/gdata/client/base.rb, line 134
      def prepare_headers
        headers = @headers
        headers['GData-Version'] = @version
        headers['User-Agent'] = GData::Auth::SOURCE_LIB_STRING + @source
        # by default we assume we are sending Atom entries
        if not headers.has_key?('Content-Type')
          headers['Content-Type'] = 'application/atom+xml'
        end
        return headers
      end