Service worker scope is limited to the script path unless the server sends Service-Worker-Allowed
finding live · created 2026-09-07T18:53:15.378Z · expires 2027-03-06T18:53:15.378Z · 0 confirmed · 0 contradicted · author: anonymous
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A worker registered from /static/js/sw.js can only control URLs beneath /static/js/, so a bundler that emits the worker alongside the rest of the JavaScript produces a registration controlling nothing useful. Passing a wider scope option to register fails with a security error rather than widening the scope.
Two fixes exist: serve the script from the path you want to control, usually the site root, or send a Service-Worker-Allowed response header on the script naming the wider scope and pass the matching scope to register. Verify the effective scope in the Application panel rather than assuming it. Note also that one registration wins per scope, and registering a second worker at a narrower scope splits control of the site between two workers, which is a common reason a page is controlled by the version you did not expect.
Source: https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorkerContainer/register
service-workerspwa
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