Methods and systems of client-side caching of pages with changing content

The present invention relates to Internet based and web applications and the need to reduce page latency and bandwidth usage. The invention can achieve these goals by making use of the cache built in to standard web browsers. In one embodiment, the invention provides that a web application user will use their browser to request a page from the application web server, which responds with a small page that includes a script. The script appends a previously established cookie value to the URL originally requested and the browser then re-requests the URL with the appended cookie value. (The server computes the cookie value based on the last modified time of the data used to generate the page.) If the most recent version of the page is in the browser cache, the browser gets a cache hit, which means the page is retrieved from browser cache rather than from the server, rapidly displaying the page to the user. If, on the other hand, there is only an older version of the page in the browser cache, there is a cache miss (because the rewritten URL will not match any URL in the cache) and the browser will send the request to the server to retrieve the most recent version of the page.