how to block https website using squid

Question

I'm wondering if anybody knows how to block https websites using squid. Below is snipped configuration I have in my squid config:

external_acl_type my_client_bl ttl=5 negative_ttl=0 %DST %SRC /var/www/app/ACLBlacklist
acl badsites external my_client_bl
http_access deny badsites
http_access deny CONNECT badsites

Above configuration works with http but with https got a problem. When I block http://twitter.com, this one works but with https://twitter.com not working.

Answer 1

I have carefully research this. I think the issue here when a proxy reply a forbidden 403 response from https request some browsers will allow to render html error page from proxy but unfortunately some browsers will not for some security issues (i don't get their point on this).

As of the moment and tested OPERA support forbidden 403 response from https request. Firefox, chrome, safari and IE refuse to support this.