How to retrieve data which is posted to secure page

Hi,
Looking for help on implementing requirement where user will see a
form even without logging in to the website. Once user submit the form
the data is posted to secured page, that' s why user is redirected to
login page.
How do I get the data posted by user because based on that I need to
show him next step once he logged in.

THanks,
Vinay

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