If you have the Gravity beacon installed on the site with the same domain as the server you're using to serve the
current request during which you're retrieving recos, then a Gravity cookie will already be in place and
available in the current request's cookies.
See com.gravity.gdk.user.GravityUser.fromRequest and com.gravity.gdk.user.GravityUser.fromCookies.
If you have the Gravity beacon installed on the site with the same domain as the server you're using to serve the current request during which you're retrieving recos, then a Gravity cookie will already be in place and available in the current request's cookies.