Use this directive to restrict collapsed forwarding to a subset of
eligible requests. The directive is checked for regular HTTP
requests, internal revalidation requests, and HTCP/ICP requests.
collapsed_forwarding_access allow|deny [!]aclname ...
This directive cannot force collapsing. It has no effect on
collapsing unless collapsed_forwarding is 'on', and all other
collapsing preconditions are satisfied.
* A denied request will not collapse, and future transactions will
not collapse on it (even if they are allowed to collapse).
* An allowed request may collapse, or future transactions may
collapse on it (provided they are allowed to collapse).
This directive is evaluated before receiving HTTP response headers
and without access to Squid-to-peer connection (if any).
Only fast ACLs are supported.
See also: collapsed_forwarding.