Document has expired I created my own module and it has a form that is created using the Form API.  The problem is that when a user clicks on a link on the form after hitting the submit button, and goes to the link, and then hits the BACK button on their browser, then the user gets a message of "Document expired.  The document is no longer available".  

How can I make it so that the user can hit their BACK button and be taken back to the form?
A better solution might be to add a link on the page that the user sees after the form, that takes them back to the form. You might need to put back in some session values. If the form was already submitted, you'll want to decide whether to load their submission or take them to a blank, new form.