Hi,
As of Oct 2015, your ‘Create an Exit’ solution is no longer recognized in DFP or DCS.
When using the following function, we are able to specify and click-through to the target URL during preview, but Google still doesn’t count it as an exit, thus preventing ad upload:
function bgExitHandler(e) {
Enabler.exitOverride('Background Exit', 'http://www.permanent-url.com');
}
document.getElementById('bg-exit').addEventListener('click', bgExitHandler, false);
Please let me know if I can provide further insight.