Hello, I am in the "Learn About Open Redirects" section of the  "App Logic Vulnerability Prevention" module in the Developer Advanced trail. I am stuck on the Open Redirects Basics Challenge because the changes I make to the completion URL parameter are not making it to the Save or Cancel methods: The completion value is still showing up as 'a07' no matter what I put at the completion parameter in the header.

Even before the challenge, the Open Redirects  Basics Demo is not working, I assume for the same reason the challenge page is not working. As given in the instructions, I enter '/apex/open_redirect_basics_demo?onSave=https://www.youtube.com/watch?v=dQw4w9WgXcQ', then I edit the Quantity field and click Enter but the page doesn't get redirected to youtube. Is there some kind of a setting I need to set so that upon clicking Save or Cancel, the new value of the onSave URL parameter is sent to the Save and Cancel methods?