---
name: SSR
description: Server-side rendering flow and caching.
applyTo: "api/hooks/ssr/**"
---

# SSR and Caching

- SSR request flow: `api/hooks/ssr/get_read.js` calls `api/hooks/lib/ssr-server.js` and injects `window.__SSR_CACHE__` used by `api/hooks/lib/ssr.js` on the client.
- SSR cache HTML is stored in the `ssr` collection.
- SSR builds output to `api/hooks/lib/app.server.js` via `yarn build:server`.
- SSR route validation is currently disabled and returns -1 in `api/hooks/config.js`; update this when enabling SSR per route.