A Google login started on the Vite dev server (:5173) always came back to the
fixed :8080 callback, because login/link/upgrade passed the static
settings.oauth_redirect_url. Derive the redirect_uri from the request origin
instead, but only in local dev and only for a known dev-host allowlist —
production still uses the fixed configured URL and never trusts the Host header
(host-injection guard). Set the Vite proxy to changeOrigin:false so it forwards
the real Host:localhost:5173 (it was rewriting it to the 127.0.0.1:8080 target).
Both callbacks must be registered in the Google console.
peter
b4d2ad75e0