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    2c -- most people (especially in the beginning) write sites assuming a user at a browser is using the service. They haven't considered the case that third party malicious site evil.com is probing his API. Returning a * sorta means you've considered this. Although not if you just set your server to respond with a *, and your particular site may not have considered this.. I still think the spec is cumbersome and seems too server centric. Commented Feb 16, 2017 at 23:10
  • This is the correct answer. If I have a native app, I can make whatever cross-site cookie-less requests I want, but in the browser, that is not allowed. :( Commented Aug 14, 2018 at 12:46