Any reason to have a session ID within a form?

Question

is there any reason for me to place the session ID within a form, as a hidden form field?

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Thank you everyone!! :)

Answer 1

This is a part of one of the possible methods for preventing against cross-site request forgery attacks.

It can be used in the Synchronizer Token Pattern.

It can also be used in the "Double-Submit Cookies" method mentioned at the bottom of the page linked to above.

Answer 2

The only reason would be to maintain session state for all users including the ones that have disabled cookies.