demo · v133

Prefetch 5-min rule removal

Fire a real <link rel="prefetch">, then re-fetch the same URL and inspect Resource Timing. Pre-133, Chrome forced a 5-minute survival window for prefetches regardless of Cache-Control. Post-133 the standard HTTP cache rules apply.

re-fetch duration (ms)
-
transferSize (0 = cache hit)
-

checking support...

the code

// Server may send: Cache-Control: max-age=30
// Pre-Chrome 133: prefetch entry stayed 5 minutes regardless.
// Post-133: prefetch obeys Cache-Control like any resource.

const l = document.createElement("link");
l.rel = "prefetch";
l.href = url;
document.head.appendChild(l);

see also