HTTP clients may send a pipeline of 1+N requests to Squid using a
single connection, without waiting for Squid to respond to the first
of those requests. This option limits the number of concurrent
requests Squid will try to handle in parallel. If set to N, Squid
will try to receive and process up to 1+N requests on the same
connection concurrently.
Defaults to 0 (off) for bandwidth management and access logging
reasons.
NOTE: pipelining requires persistent connections to clients.
WARNING: pipelining breaks NTLM and Negotiate/Kerberos authentication.