importScripts('/common/get-host-info.sub.js'); const response_text = 'This load was successfully intercepted.'; const response_script = `const message = 'This load was successfully intercepted.';`; self.onfetch = event => { const url = event.request.url; if (url.indexOf('synthesized-response.txt') != -1) { event.respondWith(new Response(response_text)); } else if (url.indexOf('synthesized-response.js') != -1) { event.respondWith(new Response( response_script, {headers: {'Content-Type': 'application/javascript'}})); } };