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Re:Only 90s web developers remember this (2014) by fault1 on Sunday November 21, 2021 @10:17AM (#29296729)
Don't forget rabid useragent sniffing to send browsers the "good pages": http://webaim.org/blog/user-agent-string-history/

this probably started in 1997-or 1998 or so, and probably had its apex in the mid 2000s especially with the hegemony of IE5.

Re:Only 90s web developers remember this (2014) by p2p_astroturf on Sunday November 21, 2021 @12:53PM (#29298167)
And now today CloudFlare serves you a captcha if they don't like your user-agent and IP address combo.