Referer changes for ad clicks

We are updating the referer of ad clicks to improve security and system reliability for users searching on Google. Starting within October, the referer for many ad clicks will only contain the Google domain from which the click occurred (domains like https://www.google.com or https://www.google.ca). This means that we will no longer be communicating specific paths such as "google.com/aclk" or "googleadservices.com/pagead/aclk....