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async function get_prefetch_info(href) {
const response = await fetch(`${href}&mode=info`, {mode: "cors"});
return await response.json();
}
async function prefetch(p = {}, t) {
const link = document.createElement("link");
link.rel = "prefetch";
link.as = p.as;
if (p.crossOrigin)
link.setAttribute("crossorigin", p.crossOrigin);
const uid = token();
const params = new URLSearchParams();
params.set("key", uid);
for (const key in p)
params.set(key, p[key]);
const origin = p.origin || '';
link.href = `${origin}/preload/resources/prefetch-info.py?${params.toString()}`;
document.head.appendChild(link);
while (!(await get_prefetch_info(link.href)).length) { }
return {href: link.href, uid};
}
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