how can i prevent a user from viewin a page without using the django @login decorator

i have a form that redirect a user to another page
when it validates


but again i discover that a user can view the that page by typing it on his or her url
without following the normal process of validation

how can i stop this, how can i force a user to see that redirect page only
when he/she  comes only from the main form page, what i mean a user
can only be redirected to the accept page only when he has the valid credentials
otherwise he/she cannot view the accept page even if he entered the correct url
on his browser.

 i intend doing  that without django @login decorator
 thanks

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