Goal: Satisfy client request without involving origin server
-
User sets browser: Web accesses via cache
- todo what does that mean?
-
Browser sends all HTTP requests to cache
- If object is in cache, proxy server returns object
- Otherwise, cache requests object from origin server, then forwards to client
-
Cache acts as both client and server
- Server for original requesting client
- Client to origin server
-
Cache is typically installed by ISP (university, company, residential ISP)
Motivation:
- Reduce response time for client requests
- Reduce traffic on an institution’s access link
- Internet dense with caches
- Enables “poor” content providers to effectively deliver content
