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self.addEventListener('fetch', function(event) {
var testcase = new URL(event.request.url).search;
switch (testcase) {
case '?response-object':
event.respondWith(new Response('body'));
break;
case '?response-promise-object':
event.respondWith(Promise.resolve(new Response('body')));
break;
case '?other-value':
event.respondWith(new Object());
break;
}
});