Matan · SEO · Performance

Cache headers

Cache-Control/Expires tell browsers and CDNs whether they may reuse the response.

Pass condition in our engine: Cache-Control or Expires is present.

1. Problem description

Missing cache headers force a full origin hit on every view. For HTML you may want a short max-age plus stale-while-revalidate; for hashed assets you want immutable long cache. Either way, send an explicit policy.

2. Most common causes

  • The framework’s default is cache-control: private, no-store on public pages.
  • A security plugin disables all caching.

3. How to fix it

  1. Set Cache-Control on HTML (e.g. public, max-age=60, s-maxage=300 for marketing pages).
  2. Use long immutable cache on fingerprinted static files.
  3. Do not cache personalised HTML at the CDN without a vary strategy.

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