Under the present invention, when a request for a web page is received from a client on a server, the web page is built and analyzed for cacheablity. If the web page is cacheable, an entity tag is generated. The entity tag generally identifies the various sources of dynamic content in the web page, and...http://www.google.com.hk/patents/US20050033926?utm_source=gb-gplus-share專利 US20050033926 - Method, system and program product for validating remotely cached dynamic content web pages
