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self.addEventListener('fetch', function(event) {
var url = event.request.url;
if (url.indexOf('sample?test') == -1) {
return;
}
event.respondWith(new Promise(function(resolve) {
var headers = new Headers;
headers.append('foo', 'foo');
headers.append('foo', 'b\0r'); // header value with a null byte
resolve(new Response('hello world', {'headers': headers}));
}));
});