: If your server is sitting behind a reverse-proxy, application firewall, or other type of network device, it may provide it's own caching mechanism and rewrite some of the HTTP headers being
If your server is sitting behind a reverse-proxy, application firewall, or other type of network device, it may provide it's own caching mechanism and rewrite some of the HTTP headers being sent from your server.
You can use the Live HTTP Headers Firefox plugin from a remote connection to judge exactly what's being received by an outside visitor.
You can also try overriding the HTTP headers sent by including the cache control value in a meta tag inside the <head> of the document:
<meta http-equiv="Cache-Control" content="no-cache">
You could list other headers in this fashion as well, with one tag per header value.
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