Hi,
I don't want cache 302 beckend responses and correct vcl_fetch():
sub vcl_fetch {
    if (!obj.cacheable) {
        pass;
    }
    # don't cache redirects
    if (obj.status == 302) {
        pass;
    }
    if (obj.http.Set-Cookie) {
        pass;
    }
    set obj.prefetch =  -30s;
    deliver;
}
But it does'n work.
-- 
Michael