I am trying to return the entire XML chunk to the controller in order to make them downloaded as an XML file.

  from xml.etree import ElementTree as ET  
    @api.model
    
    def _xml_download(self): 
        root 
        root = ET.Element("Test A")
        doc = ET.Element("Test B")
        root.append(doc)
        return ET.ElementTree(root)

And here is my controller:

class TestXMl(http.Controller):
    @http.route('/xml/download/report', type='http', auth="user")
    @serialize_exception
    def sale_xml_download(self, model, id, filename=None, **kw):
        filename = 'Test%s.xml'%('Test')
        records= http.request.env['sale.order'].search([('some_attribute', '=', True)])
        if records:
            xml_record = http.request.env['sale.order']._xml_download()
        else:
            xml_record = 'Test'
        filename = 'Test%s.xml'%('Test')
        headers = [
                ('Content-Type', 'application/xml'),
                ('Content-Disposition', content_disposition(filename)),
                ('charset', 'utf-8'),
            ]
        return request.make_response(
                    xml_record, headers=headers, cookies=None)

But I xml_record is not getting the element tree. It is saying TypeError: 'ElementTree' object is not iterable - - - In this case how we suppose to pass the elementTree. Looking for useful response, thank you in advance