Lossing session while going from un secure to secure pages

Hello everyone,
If page1.aspx starts the session and then user redirects from page1.aspx to page2.aspx, but page2.aspx needs to be secure (starts with https).
If we write absolute URL for redirection, session would be lost. Whats the best and efficient way to redirect from unsecure to secure apsx pages without loosing Session?


Thanks in advance.
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