Moving edge-side includes to the real edge: the clients
Michael Rabinovich, Zhen Xiao, Fred Douglis, Chuck Kalmanek · 2003
Edge-Side Includes (ESI) is an open mark-up language that allows content providers to break their pages into fragments with individual caching characteristics. A page is reassembled from ESI fragments by a content delivery network (CDN) at an edge server, which selectively downloads from the origin content server only those fragments that are necessary (as opposed to the entire page). This is expected to reduce the load and bandwidth requirements of the content server.