UPDATE (na verdade tentei isso do meu squid ...):
acl is_ssl port 443
https_port 443 cert=<yourcert> key=<yourkey> accel name=site_ssl defaultsite=<y\
our_external_site>
cache_peer <your_internal_ssl> parent 443 0 no-query originserver ssl sslflags=\
DONT_VERIFY_PEER name=site_ssl
cache_peer_access site_ssl allow is_ssl
cache_peer_access site_ssl deny !is_ssl
acl nonssl port 80
http_port 80 accel defaultsite=<your_external_site> name=site_nonssl
cache_peer <your_internal_nonssl> parent 80 0 no-query name=site_nonssl origins\
erver
cache_peer_access site_nonssl allow nonssl
cache_peer_access site_nonssl deny !is_nonssl
RESPOSTA ORIGINAL ABAIXO AQUI:
você quer algo como
cache_peer 10.0.0.11 parent 443 0 no-query originserver ssl sslflags=DONT_VERIFY_PEER name=site_ssl
acl sites_server_3 dstdomain site_ssl
cache_peer_access site_ssl allow ssl_servers
http_access allow ssl_servers