#GTMTips: Cross-Domain Tracking With Server-Side FPID Cookie
The FPID cookie in server-side tagging for Google Tag Manager is an HttpOnly, server-managed ID cookie that’s designed to replace the JavaScript-managed _ga cookie used by Google Analytics 4 and Universal Analytics. For more details about the cookie itself, check out my previous article on FPID. In that article, I mentioned one caveat for adopting FPID being the fact that cross-domain tracking will not work. I mean, how could it? FPID is an HttpOnly cookie, which means it’s not available to JavaScript in the browser. Read More…