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Caching | 
 
- Caching helps latency, and the planet is big
   
 - Flash-crowd problem (Larry Niven) - "Slashdot effect"
   
 - Hypothesis often held as theory or taken as fact: "The fraction of dynamically generated content is increasing with time"
 - What is cachable?
- Why bother to cache, if nothing is cachable?
 - Can you trust the caching? (no, in HTTP/1.0, more so in HTTP/1.1)