FAQ - server-side tagging
Answers on GTM Server-Side, hosting (Stape, GCP, Zaraz), first-party subdomain, CAPI integrations and maintenance.
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Server-side basics
What is server-side tagging (GTM SS)?
A separate Google Tag Manager container running on a server (Stape, GCP, Zaraz, etc.) that receives data from the web container and forwards it to vendors (GA4, Meta CAPI, Google Ads). It limits browser-side data and extends first-party cookie lifetime.
When is server-side worth implementing?
With large ad budgets, ad-blocker issues, Meta CAPI/TikTok Events API needs or requirements to limit PII in the browser. Compare solutions in the SSC catalog.
Does server-side replace Consent Mode?
No. Consent signals must be passed to the server container and honored by server-side tags. CMP + Consent Mode v2 remain required in the EEA for Google advertising.
Hosting and costs
Stape.io or Google Cloud for GTM SS?
Stape - fast start, ready templates, managed hosting from ~$17/mo. GCP Cloud Run - full control, lower TCO at very high volume, higher DevOps overhead. Use the SSC selector to match.
How much does server-side tagging cost?
Managed (Stape, Addingwell): from $0-20/mo (low traffic) to hundreds at millions of requests. GCP: Cloud Run + load balancer cost varies by region and scale. Cloudflare Zaraz uses a different Workers model. Check vendor pricing in the catalog.
What is a first-party subdomain?
E.g. ss.yourdomain.com - the server container runs on your subdomain instead of Google’s domain. First-party cookies are less likely to be blocked and may last longer.
Rollout and maintenance
How do I connect web and server containers?
In the GA4 config tag (or dedicated client) set the transport URL to your SS subdomain. The server container needs a GA4 client receiving incoming requests.
How do I implement Meta Conversions API via GTM SS?
Use a Meta CAPI template in the server container (Stape community templates or native). Required: pixel ID, access token, event_id deduplication between browser and server.
How do I audit a server-side rollout?
Use the server-side checklist (16 items): architecture, DNS/SSL, tags, consent routing, monitoring. Test in GTM Preview for both containers (web + server).