Cache Control Immutable - A Year Later

Analysis
2

Nice! Makes me wonder about some other areas to explore:

  • % of sites with immutable resources that are first party as opposed to external FB/Google resources
  • file size and its relationship with immutability - eg are small files less likely to be cached this way because of their inexpensiveness?
  • opportunity for long-lived resources (maxage > 1 year) to be converted to immutable - eg if they’re intended to be cached “forever” then why not make them immutable
  • opportunity for “cache-busted” resources (?version=1.2.3) to be immutable, which are assumed to never change without also changing URL
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