Force traffic to HTTPS in Varnish 3.x

ForceHTTPSVarnish3.vcl

sub vcl_recv {
    if (req.http.X-Forwarded-Proto !~ "https") {
        error 850 "Moved permenantly";
    }
}

sub vcl_error {
    if(obj.status == 850) {
        set obj.http.Location = "https://" + req.http.host + req.url;
        set obj.status = 301;
        return(deliver);
    }
}

sub vcl_hash {
  hash_data(req.http.X-Forwarded-Proto);
}