Varnish VCL code examples for HLS stats

varnish.recv.vcl

sub vcl_recv {
    # Only userid are left in req.http.cookie at this point.
    cookie.parse(req.http.cookie);
    cookie.filter_except("userid");
    if (cookie.isset("userid")) {
        std.log("userid value is: " + cookie.get("userid"));
    } else {
        cookie.set("userid", regsub(std.random(0, 320000000), "\..*", ""));
        std.log("userid value is: " + cookie.get("userid"));
    }
}