{"id":74,"date":"2026-07-10T13:37:00","date_gmt":"2026-07-10T11:37:00","guid":{"rendered":"https:\/\/www.lukaswojcik.com\/blog\/?p=74"},"modified":"2026-08-20T17:51:42","modified_gmt":"2026-08-20T15:51:42","slug":"how-to-implement-google-tag-gateway","status":"publish","type":"post","link":"https:\/\/www.lukaswojcik.com\/blog\/en\/digital-analytics\/how-to-implement-google-tag-gateway\/","title":{"rendered":"How to Implement Google Tag Gateway"},"content":{"rendered":"\n
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The gateway does not change the script, only where it comes from: the browser fetches it from the site’s own domain, the reverse proxy fetches it from Google and passes the original client on via the forwarded headers.<\/figcaption>\n<\/figure>\n\n\n

In an era of tightening privacy restrictions (such as ITP in Safari) and the growing popularity of ad blockers, maintaining high-quality analytical data is a significant challenge. The solution is the Google Tag Gateway (GTG)<\/strong>. This involves routing analytical traffic through the site’s own domain (a first-party context), which allows for extending cookie lifespans and bypassing basic blockades.<\/p>\n\n\n\n

How is this mechanism implemented? The architecture depends on the current setup.<\/p>\n\n\n\n

Two Implementation Scenarios<\/h2>\n\n\n\n

The approach to Google Tag Gateway differs depending on whether Server-Side GTM is already in use or the implementation relies on the browser alone.<\/p>\n\n\n\n

Scenario<\/strong><\/td>How it works<\/strong><\/td>When to choose?<\/strong><\/td><\/tr><\/thead>
Client-Side GTM Only<\/strong><\/td>Reverse Proxy directly tunnels requests to Google servers (e.g., downloads gtm.js<\/code> and forwards Google Analytics hits).<\/td>To obtain first-party cookies quickly and bypass ad blockers without the costs of GTM server infrastructure.<\/td><\/tr>
Client-Side + Server-Side GTM<\/strong><\/td>Browser traffic reaches the Server-Side GTM container via a Reverse Proxy, which processes the data before sending it to external tools.<\/td>For full control over data, IP masking, and integration with server-side conversion APIs. This is the recommended approach.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Quick Deployment with Cloudflare<\/h2>\n\n\n\n

If the domain uses Cloudflare, creating a tag gateway is extremely simple using Cloudflare Workers<\/strong>.<\/p>\n\n\n\n