[SEO] Cache mechanism notes

SEO、Web / 2023 年 4 月 6 日
  • Check if the cache is fresh and do NOT send request

Expires

Cache-Control: max-age=...

  • Send request and check if 304 or a fresh payload should be returned:

Last-Modified <===> If-Modified-Since

Etag <===> If-None-Match

  • Do not cache anything

Cache-Control: no-store

  • Stale-while-revalidate

Cache-Control: no-cache