Multiple SSL certificates with Squid reverse proxy

Squid doesn't support SNI what is written here. So to have in Squid:

https://server1.com (cert for server1.com) => http://mylanip1
https://server2.com (cert for server2.com) => http://mylanip2

you have to:

1. Put the addresses on different IPs, because a certificate is assigned to a uniqe pair [IP, port].
2. Configure Squid like this:

https_port server1.com:443 cert=/etc/ssl/server1.pem vhost
https_port server2.com:443 cert=/etc/ssl/server2.pem vhost

cache_peer mylanip1 parent 80 0 name=lanip1 no-query originserver
cache_peer_domain lanip1 server1.com

cache_peer mylanip2 parent 80 0 name=lanip2 no-query originserver
cache_peer_domain lanip2 server2.com

It would be better if you had servers on subdomains of a domain for which you have a wildcard certificate (e.g. s1.myserver.com, s2.myserver.com, certificate for *.myserver.com). Then you could use only one https_port entry

https_port 443 cert=/etc/ssl/wildcard.myserver.com.pem vhost

So it's possible in squid.

But such simple case is much easier to do with httpd and Name-based Virtual Hosts. You will save one public IP. In Centos 6 openssl and httpd versions support SNI. It's visible from openssl version. (See here and here)