pconn_lifetime

pconn_lifetime

This patch add a new configuration option the 'pconn_lifetime' to allow users
set the desired maximum lifetime of a persistent connection.

When set, Squid will close a now-idle persistent connection that
exceeded configured lifetime instead of moving the connection into
the idle connection pool (or equivalent). No effect on ongoing/active
transactions. Connection lifetime is the time period from the
connection acceptance or opening time until "now".

This limit is useful in environments with long-lived connections
where Squid configuration or environmental factors change during a
single connection lifetime. If unrestricted, some connections may
last for hours and even days, ignoring those changes that should
have affected their behavior or their existence.

This option has the following behaviour when pipelined requests tunneled
to a connection where its lifetime expired:

 1. finish interpreting the Nth request
    check whether pconn_lifetime has expired
 2. if pconn_lifetime has expired, then stop further reading and
    do not interpret any already read raw bytes of the N+1st request
 3. otherwise, read and interpret read raw bytes of the N+1st request
    and go to #1.

This is a Measurement Factory project