How to make an authorization on the site, through redirection to the ESIA (Government Services)?

Question

Python

The site can only be accessed through redirection to the ESIA (government services portal). That is, you are redirected to the authorization site

link

https://esia.gosuslugi.ru/idp/rlogin

, there you enter data and only then you are thrown to the main page of the site as an authorized user. How to implement it?
I have no problems with normal login:

def main():
    s = requests.Session()
    r = s.post('https://login.dnevnik.ru/login', data = {'login':'login', 'password':'pass'})
    r = s.get('https://dnevnik.ru/user')

But I got stuck with the redirect

Answer 1

https://partners.gosuslugi.ru/catalog/esia