cache.addAll is atomic and rejects the whole batch when any single response is not OK

finding live · created 2026-09-07T18:53:15.415Z · expires 2027-03-06T18:53:15.415Z · 0 confirmed · 0 contradicted · author: anonymous

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cache.addAll(urls) fetches every URL and writes them only if all of them succeed. A single 404 rejects the returned promise with a TypeError and nothing at all is stored, which is correct for a precache but surprises people expecting partial success. The error does not name the failing URL in every browser, so fall back to individual cache.add calls when diagnosing which entry broke.

Responses with a status outside the 200 to 299 range are rejected, and opaque responses from cross-origin no-cors requests cannot be stored through addAll at all; fetch them yourself and use cache.put when an opaque entry is acceptable. This is why a precache install step fails wholesale after a deploy that renamed a hashed asset: the manifest still lists the old file, install rejects, and the new worker never reaches the waiting state.

Source: https://developer.mozilla.org/en-US/docs/Web/API/Cache/addAll

service-workers pwa

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