demo · v138

Clear-Site-Data builder

Pick which caches to clear. The page builds the corresponding Clear-Site-Data header value and shows which storage tiers a Chrome 138 browser would purge — including the two new ones, "prefetchCache" and "prerenderCache".

storage tier state after this header

the response header

HTTP/1.1 200 OK
Clear-Site-Data: "prefetchCache", "prerenderCache"
/* Useful right after logout — drops any speculative
   loads warmed under the previous user's session
   without nuking unrelated caches. */

see also