问HN：如何保护您的网站/服务免受不必要的流量？
所以……如果像 Anubis 这样的工作量证明（PoW）方案在实际中最终不起作用，因为机器人/爬虫越来越多地使用无头浏览器，能够解决验证码、证明等；<p>我们实际上有哪些选项可以过滤或阻止不必要的流量？<p>我们能想出哪些巧妙的方案，而不依赖于像 Cloudflare 这样的集中式服务？
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So... If PoW (proof-of-work) schemes like Anubis ultimately don't' work in practise, because Bots/Crawlers are increasingly using headless browsers, are able to solve captures, proofs, etc;<p>What options do we have realistically to filter out or block unwanted traffic?<p>What clever schemes can we come up that don't rely on centralised serices like Cloudflare?