The HTTP cache will be ignored when requesting updates to the service worker. Requests for importScripts will still go through the HTTP cache. But this is just the default. A new registration option, ServiceWorkerRegistration.updateViaCache is available that offers control over this behavior.
Docs: * (Once written) https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorkerRegistration/updateViaCache * https://github.com/w3c/ServiceWorker/issues/893