demo · v140

Blob Controller

A SharedWorker booted from a blob URL now inherits the parent page's service worker. Fetches the worker makes go through the SW just like the page's. The probe below boots a blob worker and round-trips a fetch through it.

SW unknown controller unknown

// Pre-140: a SharedWorker from a blob URL ran in an
//          uncontrolled context. Network fetches inside
//          the worker never hit the SW.
//
// 140+: blob workers inherit the controller of the
//       starter (the page), so /api/* etc. get
//       intercepted as expected.

const w = new SharedWorker(blobUrl);
// w now sees navigator.serviceWorker.controller

see also