Varnish as Redirection Server

[Kelvin Loke]

I am using Varnish purely for redirection and cater for below scenario:

1. If http://www.abc.com/url1, redirect to http://www.abc.com/url2
2. If http://www.xyz.com/url1, redirect to http://www.xyz.com/url2

I tried to put the req.http.host variable inside, but Varnish has
error when restarting, I am wondering on how to actually input the
variable into error message?

=========================================
sub vcl_recv {
    if (req.url ~ "/url1") {
        error 750 "http://" req.http.host "/url2";
    }
    error 404 "NOT FOUND";
}

sub vcl_error {
    if (obj.status == 750) {
        set obj.http.Location = obj.response;
        set obj.status = 301;
        return(deliver);
    }
}
=========================================