third_party/blink/web_tests/external/wpt/signed-exchange/resources/service-worker.js - chromium/src - Git at Google

 self.addEventListener('fetch', function(event) {
   event.respondWith(new Response(
     '<body>Generated by service worker</body>',
     {headers:[['content-type', 'text/html']]}));
 });
	self.addEventListener('fetch', function(event) {
	event.respondWith(new Response(
	'<body>Generated by service worker</body>',
	{headers:[['content-type', 'text/html']]}));
	});