Recommended limit_req and limit_conn for location ~ \.php$ {}

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Hello,

Not sure if it can help you, because only some bots respect it and not in
the same way, but you could look at the "crawl-delay" directive in the
robots.txt file:
https://en.wikipedia.org/wiki/Robots_exclusion_standard#Crawl-delay_directive

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,269862,269869#msg-269869