Reset Age header

varnishtest "Check that Age header can be set to 0s"

server s1 {
        rxreq
        txresp
} -start

varnish v2 -vcl+backend {
        sub vcl_deliver {
                set resp.http.x-tier-mid = "mid";
        }
} -start

varnish v1 -vcl+backend {
        sub vcl_backend_response {
                set beresp.http.Age = 0s;
        }

        sub vcl_deliver {
                set resp.http.x-tier-edge = "edge";
        }
} -start

client c1 -connect ${v1_sock} {
        txreq
        rxresp
        expect resp.http.x-tier-edge == "edge"
        expect resp.http.Age == 0

        delay 1
        txreq
        rxresp
        expect resp.http.x-tier-edge == "edge"
        expect resp.http.Age > 0
} -run