Filtering headless bots (like phantomJS) on the fly. How to do?

Question

Bots

When buying traffic, we meet a lot of bots. The task is to redirect bots to one page, and normal ones to another. The question is how to do it on the fly? How to determine who is a bot, who if normal. If there is some part of the normal cut off - this option is also suitable. The main thing is to weed out the bots. Perhaps look towards webkit, storage, browser plugins?
PS The captcha type option is "not on the fly". Those. the method without actions of users is necessary.

Answer 1

That's just bots based on phantomJS to weed out with difficulty. At best, you can track the frequency of requests from one IP, but there is no guarantee that there is no legitimate user there. Well, a bot can quickly bypass such a check simply by sending requests through a bunch of proxies, and the proxy list itself is constantly rotated.