Overview

Visit: http://cookietest.leve.co?val=somevaluehere
    
You'll be redirected to http://cookietest-host.wurdig.com ... 
which will load an iframe for cookietest-iframe.jasonleveille.com ... 
which will request the pixel http://cookietest-pixel.leve.co/ ...
which should get the cookie value set during the initial request (which you can see in the request headers to http://cookietest-pixel.leve.co)