IDENTIFICATION, CACHING, AND DISTRIBUTION OF REVISED FILES IN A CONTENT DELIVERY NETWORK

摘要

A client computer sends a request for a web page to a web site host computer. The host returns an initial web page document that contains a listing of files needed to generate the web page and a revision identifier (RevID) for certain files. The RevID may be a checksum. The client then requests files that do not have a RevID from the host and requests files which do have a RevID from a content delivery network (CDN) server. The host sends the requested files to the client. If the CDN server has the files having the specified RevID it sends those files to the client. If the CDN server does not have a file having the specified RevID it requests that file from another CDN server or the host, which sends that file to the requesting server. The CDN server then sends that file to the client.