goto and 404 and 503 checks

varnishtest "Goto and fallbacks"

server s1 {
        rxreq
        txresp -hdr "backend:s1"
        expect req.url == "/client"

        rxreq
        txresp -status 404 -hdr "backend:s1"

        rxreq
        txresp -status 503 -hdr "backend:s1"

        rxreq
        txresp -hdr "backend:s1"
        expect req.url == "/client"
} -start

server s2 {
        rxreq
        txresp -hdr "backend:s2"
        expect req.url == "/fallback-404"

        rxreq
        txresp -hdr "backend:s2"
        expect req.url == "/fallback-503"
} -start

varnish v1 -vcl {
        import directors;
        import goto;

        backend default none;

        sub vcl_init {
                new s1 = goto.dns_director("${s1_addr}:${s1_port}");
                new s2 = goto.dns_director("${s2_addr}:${s2_port}");
                        }

        sub vcl_recv {
                set req.backend_hint = s1.backend();
                return (pass);
        }

        sub vcl_backend_response {
                if (beresp.status == 404 || beresp.status >= 500) {
                        set bereq.backend = s2.backend();
                        return(retry);

                }
        }
} -start

delay 1.0

client c1 {
        txreq -url "/client"
        rxresp
        expect resp.status == 200
        expect resp.http.backend == "s1"

        txreq -url "/fallback-404"
        rxresp
        expect resp.status == 200
        expect resp.http.backend == "s2"

        txreq -url "/fallback-503"
        rxresp
        expect resp.status == 200
        expect resp.http.backend == "s2"

        txreq -url "/client"
        rxresp
        expect resp.status == 200
        expect resp.http.backend == "s1"
} -run