download_xls.py

    @http.route('/web/excel.report/xls', type='http', auth="user")
    def download_xls_report(self, model, id):
        """Handle download for XLS reports."""
        # Prepare report wizard
        Model = request.registry[model]
        cr, uid, context = request.cr, request.uid, request.context
        id = int(id)
        wizard = Model.browse(cr, uid, id, context=context)
        # Get filename
        filename = wizard.get_filename()
        # Download
        return request.make_response(
            (wizard.data),
            headers=[('Content-Disposition', content_disposition(filename)),
                     ('Content-Type', 'application/vnd.ms-excel')])