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addEventListener("activate", event => {
event.waitUntil(self.registration.navigationPreload.enable());
});
async function post_to_page(data) {
let cs = await self.clients.matchAll();
for (const client of cs) {
client.postMessage(data);
}
}
addEventListener("fetch", event => {
if (event.request.url.includes("navigationPreload_page.html")) {
event.respondWith(
new Response("<!DOCTYPE html>", {
headers: { "Content-Type": "text/html; charset=utf-8" },
})
);
event.waitUntil(
(async function () {
let preloadResponse = await event.preloadResponse;
let text = await preloadResponse.text();
await post_to_page(text);
})()
);
}
});