[squid-users] tarpit, silent-drop vs. DDoS ?

[Jim Freeman]

I've scoured docs and Google for DDoS/security mechanisms, and hope I
have the lay of the land.

But I've not yet seen anything mentioned like HAProxy's
tarpit/silent-drop mechanisms :
https://cbonte.github.io/haproxy-dconv/2.2/configuration.html#4.2-http-request%20tarpit
 ... blocks the request without responding for a delay specified ...
https://cbonte.github.io/haproxy-dconv/2.2/configuration.html#4.2-http-request%20silent-drop
 ... can resist much higher loads than "tarpit", and slow down
stronger attackers. ...

Does anyone have these kinds of countermeasures in play with squid ?
[ I'm using squid 3.5.20 ]

Thanks,
...jfree