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Send the resolved local proxy origin in the proxy-owned request header for local HTTP targets, HTTPS fallback deployments, and WebSocket upgrades. This gives fallback applications a stable origin that is not overwritten with x-forwarded-host at the Vercel edge. Replace any inbound copy of the header before forwarding fallback requests to prevent spoofed values from winning. Document the contract, add release metadata, and cover configured and default origins in tests.
swarnava
requested review from
kitfoster,
mknichel,
tim123abc and
tknickman
as code owners
September 25, 2026 12:27
Contributor
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Send the resolved local proxy origin in the proxy-owned request header for local HTTP targets, HTTPS fallback deployments, and WebSocket upgrades. This gives fallback applications a stable origin that is not overwritten with x-forwarded-host at the Vercel edge.