Likely the service worker is caching the assets onto your machine. So if it comes from the service worker, you've visited the site (or the asset) before: https:

Likely the service worker is caching the assets onto your machine. So if it comes from the service worker, you've visited the site (or the asset) before: https://developers.google.com/web/fundamentals/codelabs/debugging-service-workers/#add_caching_to_your_service_worker https://developers.google.com/web/fundamentals/codelabs/debu...