What are caching headers, and does my page need them?
They are short notes your server sends with a page saying how long it may be kept and how to ask whether it has changed. With them, a returning visitor or crawler can get a quick "nothing new" instead of downloading the whole page again.
What it actually is
Every response can carry instructions about reuse. Some say how long a copy stays fresh. Others are a fingerprint or a last-changed date that lets a client come back later and ask "is this still the same?" The HTTP caching standard defines both, and the polite answer to that question, when nothing has changed, is a tiny reply with no page attached.
Why it matters
Pages are fetched far more often than they change, by people returning, by content delivery networks in front of your site, and by crawlers checking whether anything is new. Without any of these notes, every one of those visits is a full download and a full rebuild on your server. With them, the unchanged visits become cheap, the site feels quicker on a return visit, and a crawler that revisits often spends its time on what actually changed.
What good looks like
The page states a deliberate position on reuse. That might be "keep this for an hour", or "check with me first using this fingerprint", or even "never store this", which is a perfectly valid answer for a page that is personal to each visitor. What good rules out is silence, where the server leaves every cache and crawler to guess.
Being honest about it
This is a modest efficiency signal, not a visibility one, and we score it that way. A site with no caching notes still works and still gets read. We include it because it costs almost nothing, because nearly every hosting platform already does it, and because its absence usually means a custom server nobody has looked at in a while.
Where most sites go wrong
The common failure is a hand-built server or an application framework that answers with the page and nothing else, because nobody told it to say more. The opposite failure is worse but rarer: a page that is personal to each visitor marked as safe to keep for days, so a shared cache serves one person's page to the next. Both come from the same place — reuse was never decided, it was inherited.
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