REST API method POST automatic download csv with the data content from curl -X POST

[黄祥]

hello,
test/api.py
def csv():
    import pandas as pd
    from io import StringIO

    import datetime

    today = datetime.date.today()

    req_vars = request.vars

    if len(req_vars) == 1 and '' in req_vars.values():
        vars0 = "%s" % ",".join(["%s:%s" % (k,v) for k,v in req_vars.items() ] )
        vars1 = vars0[:-1]

        import ast
        vars2 = ast.literal_eval(vars1)

        import json
        vars3 = json.loads(vars1)
    else:
        vars3 = req_vars

    stream = StringIO()

    filename = 'Test - %s' % (today)

    df = pd.DataFrame(vars3)

    df.to_csv(stream, index = False, header = True, encoding = 'utf-8', sep = ',')

    response.headers['Content-Type'] = 'text/csv'
    response.headers['Content-Disposition'] = 'attachment; filename="{0}.csv"'.format(filename)

    return stream.getvalue()

terminal
curl -X POST --user admin:password -d '{"Name": ["Alex", "Ronald"], "Age": [10, 18] }' -i http://localhost:8000/test/api/csv

result on terminal
HTTP/1.1 200 OK
X-Powered-By: web2py
Content-Type: text/csv
Content-Disposition: attachment; filename="Test - 2022-02-12.csv"
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Expires: Sat, 12 Feb 2022 07:26:56 GMT
Pragma: no-cache
Date: Sat, 12 Feb 2022 07:26:56 GMT
Server: Rocket 1.2.6 Python/3.8.12
Content-Length: 27
Connection: keep-alive

Name,Age
Alex,10
Ronald,18

result on system path
with no file downloaded on system path
already tried
curl -o output.csv -X POST --user admin:password -d '{"Name": ["Alex", "Ronald"], "Age": [10, 18] }' -i http://localhost:8000/test/api/csv

got the same result

objection
REST API method POST automatic download csv with the data content from curl -X POST

question
how to do it in web2py way ?

thanks and best regards,
stifan