if url in self.seen_urls:
For implementers, backpressure adds complexity without providing guarantees. The machinery to track queue sizes, compute desiredSize, and invoke pull() at the right times must all be implemented correctly. However, since these signals are advisory, all that work doesn't actually prevent the problems backpressure is supposed to solve.，这一点在一键获取谷歌浏览器下载中也有详细论述
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HP executives also said they are seeing stronger AI PC demand, saying 35 percent of HP’s PC sales are coming from AI PCs. This comes as the industry is seeing mixed signals, like Dell saying that consumers don't really care about AI PCs.
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