Complex Backend Selection through VCL?

[T. Pascal]

>Would someone here help me with using VCL for a complex situation with
>Varnish?
>
>sub vcl_fetch {
>    if (beresp.status == 302) {
>        if (beresp.http.location ~ "(.*s01.*)" ) {
>           set req.backend = b1;
>           set req.url = beresp.http.location;
>           set req.http.host = "s01.a.com";
>        }
>        else if (beresp.http.location ~ "(.*s02.*)" ) {
>           set req.backend = b2;
>           set req.url = beresp.http.location;
>           set req.http.host = "s02.com";
>        }
>    }
>
>    restart;
>}
>
I think your "restart" is in too broad a scope (vcl_fetch is
restarting on each request?)

sub vcl_fetch {
    if (beresp.status == 302) {
        if (beresp.http.location ~ "(.*s01.*)" ) {
           set req.backend = b1;
           set req.url = beresp.http.location;
           set req.http.host = "s01.a.com";
        }
        else if (beresp.http.location ~ "(.*s02.*)" ) {
           set req.backend = b2;
           set req.url = beresp.http.location;
           set req.http.host = "s02.com";
        }
        restart;
    }

}

-T.