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function urlExists(url) {
var http = new XMLHttpRequest();
http.open('HEAD', url, false);
if (http.status != 200)
console.log(`${http.status} ${url} `)
http.send();
return http.status != 404;
}
if ("serviceWorker" in navigator) {
window.addEventListener("load", function () {
for (var i = 0; i < assets.length; i++) {
urlExists(assets[i]);
}
navigator.serviceWorker
.register("scripts/service-worker.js")
.then(res => console.log("service worker registered"))
.catch(err => console.log("service worker not registered", err))
})
}
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