- `req.fresh`: Returns `true` if client conditional cache headers (`If-None-Match`, `If-Modified-Since`) match current response headers, indicating the client's cache is fresh.
- `req.stale`: Inverse of `req.fresh`. Returns `true` if client cached data is stale, indicating updated data must be transmitted.

Q29: How do `req.fresh` and `req.stale` support HTTP Caching?

Q30: How do you scale an Express application using the Node.js Cluster module?

Q28: How do template engines (EJS, Pug, Handlebars) integrate with Express?

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Q29: How do `req.fresh` and `req.stale` support HTTP Caching?

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