session lost when switching from http to https, vice versa, in cakephp rc3

hi, I am using cakephp rc3

I will lose my cakephp session whenever i swtich http to https: or
https to http

anyone knows how to solve this problem, reason being, the user was
adding to the shopping cart, but when the protocol changes from http
to https for checkout:, the shopping cart session is empty

the same thing happens, when the use switch from https to http in the
checkout to shopping cart, the shopping cart session will be missing
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