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self.addEventListener("fetch", function (event) {
let sep = "synth.html?";
let idx = event.request.url.indexOf(sep);
if (idx > 0) {
let url = event.request.url.substring(idx + sep.length);
event.respondWith(fetch(url, { credentials: "include" }));
} else {
event.respondWith(fetch(event.request));
}
});