Which browsers support "Cache-control: immutable"?
As of February 2017, Cache-Control: immutable is supported by
- Firefox (https://bugzilla.mozilla.org/show_bug.cgi?id=1267474) since Firefox 49
Chrome (https://bugs.chromium.org/p/chromium/issues/detail?id=611416) since Chrome 54They aren't implementing this.- Safari (https://bugs.webkit.org/show_bug.cgi?id=167497) in Safari Technology Preview 24.
It is also listed on MDN and Can I Use ... ?.