title: Expire the page after submission
body: <p>I'm implementing an iAuth form for a credit application in a J2EE container (JSTL+JSP+Stripes). The vendor states in the implementation guide:</p>
  
  <blockquote>
    <p><strong>Expire the “Questions” page after answers submission</strong></p>
    
    <p>When performing iAuth transactions you will need to “expire” the page on which the consumer's questions will be displayed after they have submitted their answers. This is crucial in order to prevent a consumer from using the "back" button to modify their answers after they have already submitted them once and found that their authentication attempt was unsuccessful. Once the answers to a question set have been transmitted to <em>vendor</em>, that question session is closed. Any additional attempts at modifying the answers to the same question set will result in an "invalid transaction-continue" response.</p>
  </blockquote>
  
  <p>I am unsure what this means.</p>
  
  <p>Are "they" suggesting just setting "Cache-Control" and/or "Pragma" headers on the form page?</p>