I think it's worth being aware that the more open-ended you make the question, the more you might freeze a less-practiced-at-interviewing candidate on not knowing where to start.

I'm always ready when asking something very open ended to follow up after 15 seconds or so to say "let's talk about [area X] first." For URLs, maybe this is "let's talk about what the actual network request, if you sniffed the traffic, looks like."