Python Flask: send file from other link

run.py

import requests

 def get(cls, date: str, date_end: str, office_in_charge: str):
        user = get_jwt_identity()
        url = "http://localhost:9090/jasperserver/rest_v2/reports/reports/interactive/DTR.pdf"
        r = requests.get(url,
                         params={
                             'username': 'jasperadmin',
                             'password': 'jasperadmin',
                             'p1': user,
                             'p2': user,
                             'date': date,
                             'date_end': date_end,
                             'office_in_charge': office_in_charge
                         }
                         , allow_redirects=True)

        return send_file(r.content, as_attachment=True, mimetype='application/pdf')