1. A method for wireless traffic reduction by web content cache optimization, the method, comprising: storing web content from a web server as cached elements in a local cache on a mobile device; retrieving the cached elements from the local cache to respond to a request made at the mobile device regardless of expiration indicated in headers of the web content that is cached, wherein the request is at least partially responded to using some of the cached elements retrieved from the local cache; and generating a validator from a tag in the headers of the web content; wherein the validator indicates which of the cached elements have changed.