While most websites could switch most of their resources to longcaching, typically sites still use simple urls and short cache lifetimes because longcaching (a) would require explicit effort on the part of someone who has lots of other things to worry about and (b) isn't 100% safe for web servers to apply automatically.
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Preemptive Cache Validation: Pushing 304s
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While most websites could switch most of their resources to longcaching, typically sites still use simple urls and short cache lifetimes because longcaching (a) would require explicit effort on the part of someone who has lots of other things to worry about and (b) isn't 100% safe for web servers to apply automatically.