'use strict'; self.addEventListener('fetch', event => { if (!event.request.url.match(/body-stream-with-invalid-chunk$/)) return; const stream = new ReadableStream({start: controller => { // The argument is intentionally a string, not a Uint8Array. controller.enqueue('hello'); }}); const headers = { 'x-content-type-options': 'nosniff' }; event.respondWith(new Response(stream, { headers })); });