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ICAP at Network Edge Caches

Gary Tomlinson. Novell, Inc. USENIX Special Workshop on Intelligence at the Network Edge. ICAP at Network Edge Caches. March 20, 2000. ICAP Server. Origin. ICAP Client (Proxy Cache). User. ICAP Server. ICAP Backgrounder. Hooks external application servers into the proxy flow

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ICAP at Network Edge Caches

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  1. Gary Tomlinson Novell, Inc. USENIX Special Workshop on Intelligence at the Network Edge ICAP at Network Edge Caches March 20, 2000

  2. ICAP Server Origin ICAP Client (Proxy Cache) User ICAP Server ICAP Backgrounder • Hooks external application servers into the proxy flow • ICAP specification • http://www.i-cap.org/specification.txt • ICAP introduction • http://www.i-cap.org/icap5.ppt

  3. Edge Applications Device translation (distillation) Context mixing Content injection/substitution …….. Content filtering Identity anonymity Content redirecting ……..

  4. Engineering caches for ICAP • Buffering • Content serialization, idempotency, flow pipeline stalls • QoS • QoS propagation • ICAP server introduced flow latency • Triggers • Patterns for headers, content • Time for streaming media • Variations • Adaptations with new HTTP Varies or HTTP ETags

  5. Operational Considerations • Co-location • Bandwidth • Latency • Security • Remote callout programming • ICAP Client configuration out of ICAP scope • Call outs are URL web server applications • Potential Improvements • Secure ICAP channel, possibly SSL • Signaling channel with standard trigger grammar

  6. Ethical & Social Issues • Privacy • Access controls • Security breaches • End to end semantic correctness • Intermediary compliance with party interests • User • Provider • Conflict • Does transparent adaptations make sense? • User Opt-in • Provider Opt-in

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