def get_report_request_headers(url, cid)
      @header_handler ||= AdwordsApi::ReportHeaderHandler.new(
          @api.credential_handler, @api.get_auth_handler(), @api.config)
      return @header_handler.headers(url, cid)
    end
def get_report_request_headers(url, cid)
      @header_handler ||= AdwordsApi::ReportHeaderHandler.new(
          @api.credential_handler, @api.get_auth_handler(), @api.config)
      return @header_handler.headers(url, cid)
    end
Prepares headers for report request.