Cloudflare APO : stale-while-revalidate and small cache age

Started with Cloudflare APO after reading some good Reviews about it, but there are some questions which I want to ask about it…

  1. Does APO changes anything in caching of css and js , or affects only caching for html?
  2. Why I get small age of 3-4 but a cache hit , whenever I fetch a page after a few hours and In pagespeed insight shows Reduce server reponse time? Why it doesn’t stay in the cache ?
  3. Why does APO don’t serve stale content to first request when I update a page. Doesn’t it follow stale-while-revalidate ?
  4. Do we need to explicitly use stale-while-revalidate headers even after using APO ?
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