AppCache is now removed from insecure contexts. AppCache is a powerful feature that allows offline and persistent access to an origin, which is a powerful privilege escalation for an XSS. This will remove that attack vector by only allowing it over HTTPS. This feature was deprecated in Chrome 67.


Status in Chromium


Removed (tracking bug)

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.

  • Positive
  • No signal
  • Mixed signals



Part of the larger effort to remove powerful features on insecure origins: blink-dev discussion and API owner approval:!topic/blink-dev/UKF8cK0EwMI

Search tags

Security, OWP, AppCache,

Last updated on 2021-12-21