Contents

• Contents
• Introduction
  • Replication
  • Caching
• Overview of Web Caching
  • Caching Levels
  • Caching Architectures
    • Proxy Caching
    • Adaptive Web Caching
    • Push Caching
    • Active Caching
  • Robustness and scalability at the network level
    • Distributed proxying
    • Hierarchical cache
• Maintaining the cache
  • Cacheability
  • Replacement policies
  • Cache coherence
• Cache Replacement Policies
  • Factors to be Considered
    • Live documents
    • Interaccess time
    • Number of Previous Accesses
    • Document size
    • Cost for acquiring document
    • Type of document
  • Types of Policies
  • Greedy Dual-Size Algorithm
  • Performance Comparison
    • Performance Metrics
    • Hit Rate and Byte Hit Rate
    • Reduced Latency
    • Network Costs
    • Summary
• Cache Coherency Checks
  • HTTP headers used for coherence checks
  • Time to Live (TTL)
  • Client polling
  • Invalidation callbacks
  • If-modified-since
• Summary and Conclusions
• Bibliography