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Client-Side Includes: Fast Access to Dynamic Content

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  1. Fragment 1 Fragment 2 Client-Side Includes: Fast Access to Dynamic Content • Uses open ESI language to fragment pages • Exception handling • Conditional inclusion • Variable substitution • Downloads changed fragments only • Reassembles the page at the browser

  2. Improved Performance Browser Edge server Origin server GET /index.html GET /index.html No ESI: full page full page Page reassembly GET /index.html GET /frag2.html ESI: frag2 full page (Boilerplate, frag1 cached) Page reassembly GET /frag2.html GET /frag2.html CSI: frag2 frag2 (Boilerplate, frag1 cached)

  3. GET CSI Javascript (cacheable, same for all pages) Obtain fragments using ActiveX Obtain fragments Using HTTP Implementation Browser Edge server Origin server GET /home.html wrapper (cacheable, immutable for given page) Typically satisfied from client’s cache

  4. Benefits • Improves user experiences. • Reduces amount of content transferred over the last mile • No browser modifications or reconfiguration • Reduces total cost for content providers by: • Reducing bandwidth consumption of origin server • reducing amount of content served by CDN’s edge servers

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