Making varnish cache only certain requests with multiple backends

[Debraj Manna]

Hi,

We are using varnish for multiple round robin backends. as shown below:-

backend d1 {
    .host = "172.16.84.69";
    .port = "9802";
}
backend d2 {
    .host = "172.16.84.68";
    .port = "9802";
}
backend r1 {
    .host = "172.16.84.69";
    .port = "9802";
}
backend r2 {
    .host = "172.16.84.68";
    .port = "9802";
}

Our requirement is if the urls is of form /d/r we will send the request to
one of the backends given by r.backend() else we will send the request to
d.backend(). If the url is of form /d/r but contains a header of Type = p
then we will bypass varnish and send the request directly to backend. The
vcl looks something like below:-

sub vcl_recv {
 # ...
   # Don't cache r requests with type = p
   if(req.http.Type == "p") {
      req.backend_hint = r.backend();
       return (pipe);
   }

    if(req.url ~ "^/d/r/") {
        set req.backend_hint = r.backend();
    } else  {
        set req.backend_hint = d.backend();
}

Can some one please let me know  if the below code is the best way to
achieve what I am trying to do?
if(req.http.Type == "p") {
      req.backend_hint = r.backend();
       return (pipe);
   }
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