"Getting Started with Istio Using Docker Desktop" Web Page Not Loading

I am brand new to Docker Desktop and Istio. I am trying to follow the tutorial at Getting Started with Istio Using Docker Desktop - Docker Blog

I have successfully created Istio components and have them running in Docker containers, as shown in the screenshot here:
image

The next step of the tutorial says: “When all the bits are ready, browse to http://localhost/productpage and you’ll see this very simple demo app:”

But when I try to access the page, the browser window loader just spins and spins, never loading the demo app. (No data at all is loaded, I get an ERR_EMPTY_RESPONSE error from my Brave browser.) I am so new to this that I don’t even know where to troubleshoot this never-loading page. What might be causing this page not to load?