How does captive.apple.com force the captive login page when other websites don’t?

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Lots of hotel, coffee shop, etc. networks require accepting a ToS via a captive page. Sometimes when I join these networks I can’t get that captive page to show by just going to regular websites - the requests just time out. But I can always get it to show by going to captive.apple.com. What does this do differently that other websites aren’t doing to force the captive page?

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