title: Django Redirect to previous view
body: <p>I have a button on page x and page y that redirects to page z. 
  On page z, I have a form that needs filling out. Upon saving, I want to redirect to page x or y (whichever one I was on initially).</p>
  
  <p>Normally, you use "redirect" in the view, and specify the page you want to redirect to. But what would you do in a case like this?</p>
  
  <p>Any ideas? </p>
  
  <p>Thanks!</p>