How to limit the maximum number of client connections per IP address in SQUID

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Issue

Using client_ip_max_connections in SQUID doesn't limit the number of connections per IP address, connections are still getting accepted, but unusable
Using client_ip_max_connections in SQUID leads to SQUID leaking file descriptor resources

Environment

Red Hat Enterprise Linux (RHEL) 6 and later
squid 3.1.x (RHEL6)
squid 3.5.x (RHEL7)

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