Cache-Control: no-cache

Allows storage but requires revalidation before reuse.

no-cache does not prevent storage. It forces a conditional request (ETag or Last-Modified) so the cache never serves out-of-date content without checking.

httpcacheheaderdirective

Reference (http)

Cache-Control: no-cache

no-cache does not prevent storage. It forces a conditional request (ETag or Last-Modified) so the cache never serves out-of-date content without checking.

Common mistakes

Using no-cache to prevent storage entirely; that is no-store.

Sources

MDN HTTP Reference
IANA HTTP Field Name Registry