Cacheing won't help, and in fact, http caching is one of the #1 obstacles in AJAX programming. People who write AJAX APIs are always using cache-busting methods

Cacheing won't help, and in fact, http caching is one of the #1 obstacles in AJAX programming. People who write AJAX APIs are always using cache-busting methods to make sure that browser caches don't screw up their apps with stale data. Ah, I was referring to caching requests from the webapp producing the web page to the remote services it's consuming, assuming this was the setup - not browser caching.