Caching Issues
Potential difficulties:
- difficult (impossible?) to cache dynamically created documents
- HTTP 1.0 does not provide a reliable means for determining cachability
- problems with cache consistency
- copyright issues
Performance Criteria
- number of requests to servers
- volume of network traffic (bandwidth)
- latency experienced by end users
Note that optimizing all three can be difficult and perhaps
contradictory. Consider a size-based policy.
They use hit ratio and weighted hit ratio (by bytes) as indirect
measures of the first two criteria.