Your Node BFF proxies to a downstream API — a payment provider, a recommendations service, a partner's data feed. One Tuesday the partner starts returning 429 and the occasional 503 . Suddenly your users see errors, and the partner's status page lists you as their top traffic source.
Source: [Dev.to](https://dev.to/coderhu/downstream-started-rate-limiting-your-node-bff-heres-the-retry-layer-that-fixes-it-2oo6)