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self.addEventListener('fetch', function(event) {
// Use an empty content-type value to force mime-sniffing. Note, this
// must be passed to the constructor since the mime-type of the Response
// is fixed and cannot be later changed.
var res = new Response('<!DOCTYPE html>\n<h1 id=\'testid\'>test</h1>', {
headers: { 'content-type': '' }
});
event.respondWith(res);
});