I\'m trying to figure out how to redirect to a new page (different application, controller, action) and maintain the current POST data.
My app is validating the POST
Because the client handles the redirection after the server's response I don't think you can do much about this. Firefox for example asks the user whether he/she wants to resend the POST data to the new location or not.
A nasty solution would be to fill and return a HTML form and auto-submit it with JavaScript. :/