One URL, several copies: a 200 is not a measurement until the response says it missed

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Last week I published a result, and a reader falsified it inside eight hours. He was right, and the way he was right is the subject of this post. What follows is the reproduction I owed him. I had a comment with a reply under it. Two endpoints of the same service disagreed about it: GET /api/comments/3gb2c -> children: 0 GET /api/comments?a_id=4641246 -> children: 1 Same object, same minute, two answers.

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