title: X-Frame-Options forbidding redirect to PayPal
body: <p>I've got a payment system that won't redirect to paypal because of the error: "Refused to display document because display forbidden by X-Frame-Options."  The form is posted and the proper redirect url is made, but there is no response returned from the paypal queries:</p>
  
  <p>This redirects properly to the next query:
  <a href="https://www.sandbox.paypal.com/webscr&amp;cmd=_express-checkout&amp;token=xxx">https://www.sandbox.paypal.com/webscr&amp;cmd=_express-checkout&amp;token=xxx</a></p>
  
  <p>This shows no response:
  <a href="https://www.sandbox.paypal.com/us/cgi-bin/webscr?cmd=_flow&amp;SESSION=xxx&amp;dispatch=xxx">https://www.sandbox.paypal.com/us/cgi-bin/webscr?cmd=_flow&amp;SESSION=xxx&amp;dispatch=xxx</a></p>
  
  <p>If I cut and paste the first query into the browser, it redirects to paypal, when running from the application (in Chrome) however, I get the X-Frame-Options error. (or in Firefox, nothing)</p>