8 Verify wiring in Preview
Before publishing, confirm events flow through both the web and server containers correctly. Open GTM Preview on both, visit your site, and paste the captured result here. Optional but recommended: catches misconfigured tags, wrong measurement IDs, or broken forwarding before they reach production.
Note: This step content was written for the original dual-run architecture and is being updated for the current setup workflow. The guide overview reflects the current approach.
This step is being finalized. Content is accurate but will be updated and expanded before full release.
Deliverable
Cross-container wiring confirmed in GTM Preview mode, or explicitly skipped.
8.1 Check Both Containers in GTM Preview
Open GTM Preview for both the web and server containers, visit your site, and navigate around to trigger an event. A small panel appears and captures your analytics requests. Copy the result and paste it below — we verify that both containers received the same event with matching attribution.
Checks
- Browser Browser /collect request fires in preview mode.
- Browser Server /collect request fires in preview mode.
- Browser Client ID matches across primary GA4 and your tagging endpoint in preview.
Use the app to validate this step automatically.
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