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This is really an informative article. We've recently stumbled across this issues and all other pages I could google did not explain it as clearly as this page.

My experience was the same as yours, resources explaining things assumed technical knowledge far beyond my level or were not very clear. This was a very well put-together article.

My only contribution to the discussion is that if you get a CORS error where you wouldn't expect it, the problem might not be a CORS issue. I spent the better part of a weekend trying to debug why a request to a Google API wasn't working and why I was seeing a CORS error (same thing worked fine on another system). Turns out, it wasn't the same thing, my url had a typo...

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