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self.addEventListener('activate', event => {
event.waitUntil(
self.registration.navigationPreload.enable());
});
self.addEventListener('fetch', event => {
event.respondWith(
event.preloadResponse
.then(res => res.text())
.then(text => {
return new Response(
'<body>[' + text + ']</body>',
{headers: [['content-type', 'text/html']]});
}));
});