Google tag gateway for advertisers: Load Google scripts first-party
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This document is for developers who use server-side tagging and want to serve
Google scripts in a first-party context.
Google tag gateway for advertisers lets you load Google scripts, such as gtm.js,
directly from your first-party infrastructure instead of from Google's servers.
This lets you serve data within a first-party context either through your
tagging server or through a CDN.
Before you begin
This guide assumes that you have done the following:
[null,null,["Last updated 2025-07-28 UTC."],[],["Developers using server-side tagging can load Google scripts (gtm.js, gtag.js) from their own server for a first-party context. This requires setting up a server container, a tagging server, and a custom server domain. Steps involve configuring the client to load scripts through the server and updating the script source URL on the website to point to the custom server. Verification includes checking the browser's developer tools to confirm that `gtm.js` loads from the custom server, not Google's.\n"],null,[]]