"The problems is, to set the session variables I need to print the HTTP header first."
Why do you need to do that ?
Logically, you are either giving the user output, or redirecting him.
If the user needs to be fed some information in response to the form, you can get the receiving (redirected) page to display that information, by passing that information either as a session variable, or via a querystring.
In the absolutely last resort, you can output a page to the client, then use client-side refresh to redirect the page.
"For every complex problem, there is a simple answer ... and it is wrong." --H.L. Mencken
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