Connection pooling backend servers

[Roy Reznik <roy@xxxxxxxxxxx>]

Is there some way to maintain a connection pool to backend servers?
I tried using this:
http_port 3128 accel vhost protocol=https tcpkeepalive=60

When I try looking at it using tshark, I can see that for every
request an SSL handshake is made between squid and the back-end
server.

Thanks,
Roy.