title: Prevent access to thank you page?
body: <p>I have a php form and I'm redirecting from:</p>
  
  <pre><code>http://wthdesign.net/contact.php
  </code></pre>
  
  <p>to this url: </p>
  
  <pre><code>http://wthdesign.net/contact.php?status=thanks
  </code></pre>
  
  <p>once my form is send:</p>
  
  <p>but my problem is how do I prevent access to this url if the form was never sent in the first place?</p>