US Patent 7096418 Dynamic web page cache

A Web page cache that stores Web pages such that servers will be able to retrieve valid dynamic pages without going to a dynamic content server or origin Web server for the page every time a user requests that dynamic page. The dynamic content cache receives information that defines data upon which each dynamic page is dependent, such that when the value of any dependency data item changes, the associated dynamic page is marked as invalid or deleted. The dynamic page cache stores dependency data, receives change event information, and indicates when pages in the cache are invalidated or need to be refreshed.