This document has the following HTTP headers using RFC1123 date syntax (Date is always in RFC1123):
If you Reload the document, you will notice that the Date (generated date) field updates. If you use the Back and Forward buttons (or click on the URL window and press Return) to navigate to the document, the Date field will be unchanged, unless your local cache size (in Netscape) is set to zero, or the Expires date has passed or is invalid (0). This is an indication that Netscape is getting the document from local cache.
A Reload causes Netscape to send a GET IF-Modified-Since with Pragma: no-cache to the server. This requests any proxy servers you are using to get a new copy of the document from this server, but only if it was modified since the copy in local cache was made. If you use Shift-Reload, the request is sent as an unconditional GET and the entire document is reloaded from this server.
More on Proxy Cacheing Servers
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