Redirect 503 errors with req.restarts and vcl_error

[Fredrik Nygren]

Hi,
I have a backend server (with Tomcat). It happens that my backend  
server responds with a 503 message when is not available. In these  
cases, I want to redirect my visitors to another backend server that  
has a static HTML error page. But for some reason, my visitors sees  
Varnish default 503 message (Guru Meditation blabla ...) instead  
geting a redirect to the static backend. Advice please?

I use Varnish varnish-2.0.3-1.

Here is my VCL file:

backend barren {
        .host = "10.0.0.1";
        .port = "8090";
}

sub vcl_recv{
        if(req.http.host ~ "varnish\.domain\.se$"){
                if(req.restarts == 0){
                        set req.http.host = "varnish.domain.se";
                        set req.backend = barren;
                }else{
                        error 750 "domain.se";  
                }
        }
}

sub vcl_error{
        if(obj.status == 750){
                if(obj.response ~ "domain\.se"){
                        set obj.http.Location = 
"http://www2.domain.se/whooops/index.html 
";
                }
                set obj.status = 302;
                deliver;
        }
}

sub vcl_fetch {
        if(obj.status != 200){
                restart;
        }
}

Regards
<fredrik />





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