fix(proxy): forward the client IP to GA4 as _uip - #940
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Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>
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Navigate logical layers of code changes, visualize relationships, and explore their blast radius. No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: Organization UI Review profile: CHILL Plan: Advanced Run ID: 📒 Files selected for processing (2)
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Included review availability: This review used your included allowance. Your plan provides up to 4 included reviews per hour; 2 remain after this review. 📝 WalkthroughWalkthroughThe proxy identifies GA4 collection requests by host and path. When Priority: ➖ Normal Estimated code review effort: 2 (Simple) | ~10 minutes Severity of issue fixed: Medium Merge Risk: ⚪ Minimal · up to The proxy now populates GA4 Architecture SummaryArchitecture risk: 🔵 Low · up to The change affects 2 systems. Changed systems: Architecture concerns Review detailsSystems and components
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Review comments at @packages/script/src/runtime/server/proxy-handler.ts:
- Line 511: Update the GA collection `_uip` handling near the isGaCollect guard
so that, when IP privacy is enabled, it discards any client-supplied `_uip` and
uses the anonymized `x-forwarded-for` value instead. Preserve the existing
behavior when IP privacy is disabled, and update the corresponding `_uip` test
to expect the anonymized forwarded IP.
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packages/script/src/runtime/server/proxy-handler.tstest/unit/proxy-handler-ga-uip.test.ts
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Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>
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Fixes #939.
GA4 geolocates collection hits by the connecting IP and ignores
X-Forwarded-For. Behind the first-party proxy, every visitor is therefore placed in the server's region.This change appends
_uipto GA4 collection requests when the hit does not already carry one. The value is the first entry of theX-Forwarded-Forheader the proxy already sends, so it is anonymized exactly like the header whenprivacy.ipis set. Google receives no new data.*.google-analytics.com,analytics.google.comand its subdomains, andwww.google.com, which is where gtag.js sends a copy of the same/g/collectquery./g/collectand/g/s/collect.Ads and doubleclick endpoints are unchanged. The parameter is added after the query fingerprint stripping, so stripping cannot remove it.