Interesting. Using the originserver tagline to cache_peer seems to
prevent some of the obvious avenues. But you should still at least
prevent CONNECT requests to ports other than 443, and any requests to
ports other than those labeled "Safe" in the default squid.conf.
> acl all src 0.0.0.0/0.0.0.0
> icp_access allow all
Yup. Looks like a forwarding loop. Set up your accelerator properly,
and I imagine this will be resolved.