问HN：为什么有些链接一开始是[死链]？
我发布了 https://news.ycombinator.com/item?id=43647126，但链接一发布就显示为[无效]。我确信没有人有时间去标记它：我一点击提交，页面刷新后帖子就已经无效了。这是为什么呢？这是某种争议话题检测器还是来源过滤器吗？
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I posted https://news.ycombinator.com/item?id=43647126 and the link was [dead] on arrival. I am certain that nobody had time to flag it: the post was dead as soon as I hit Submit and the page refreshed. Why did this happen? Is this some sort of controversial topic detector or source filter?