A/B Site Testing

Well, without seeing your exact rule, I can't give you a modified version that functions on the "no cookie exists" case, but here's an example of how to check for a cookie, and if it's not present, route to a specific pool.

if(not (exists http_cooke("some_cookie"))) {
  use pool no_cookie
}

So, you could use the same rule structure, but replace the cookie name with the cookie you're looking for.

Hope this helps,

-Colin