varnish-bad-bot-detection A Varnish 4.0 subroutine for blocking bad bots (from http://omninoggin.com/web-development/block-unwanted-spam-bots-using-varnish-vcl/) Example: include "/etc/varnish/conf.d/bad_bot_detection.vcl"; sub vcl_recv { call bad_bot_detection; }