demo · v144 · PWA

Cache-Control Decision

When Chrome decides whether to re-download an installed PWA's icon, it now checks the response's Cache-Control. immutable means “don’t bother”. Paste any icon URL and see which path the browser would take.

fetch + headers: present

paste an icon URL and click check

the API

HTTP/1.1 200 OK
Content-Type: image/png
Cache-Control: public, max-age=31536000, immutable

# Chrome 144: PWA install will treat this icon as
# non-updatable until the manifest itself changes
# the icon URL. Saves bandwidth, locks the brand asset.

see also