My point is- that there may be a proxy server outside your control which is caching the content (e.g. inside a corporate network). Unless you can invalidate th

My point is- that there may be a proxy server outside your control which is caching the content (e.g. inside a corporate network). Unless you can invalidate the cache here as well, then clearing it in the browser is no good (I suppose you could set your cache headers to disable caching on intermediate proxy servers)