Hello, Thanks for you valuable comments... On Fri, Oct 3, 2008 at 4:24 AM, André Warnier <aw@xxxxxxxxxx> wrote: > I have not verified, but maybe you are interpreting the rules of caching > a bit more extensively than what the HTTP RFCs really say. > It may be that, by using your various HTTP headers, your server is doing > what it can to "suggest" to the browser that it should cache this object and > not ask again for 10 years. But maybe also, the RFC says that the client is > not "forced" to respect this, and "can" ask again if the content has been > replaced in the meantime or not. > After all, you are seeing 304 responses from the server. This means that > the browser has requested an object, but told the server "only if not > modified since..", and the 304 of the server is "No, it has not been > modified since then, you do not need to reload it". And consequently the > browser uses its cached version, and it does not insist. (I suppose, because > otherwise you would see another request from the browser, and another 200 OK > response from the server). [snipped] I have done an experinment with both IE6 & IE7, using MS default image: http://www.microsoft.com/downloads/details.aspx?FamilyId=21EABB90-958F-4B64-B5F1-73D0A413C8EF&displaylang=en In my experinment, I have set the files to expire in 10 years later, so, on the first request, the file would be downloaded and cached for 10 years. (I confirm this as I can see the expire date being set correctly in ~\Local Settings\Temporary Internet Files\...) Then, in the repeated request, IE6/IE7 would not contact the web server for any kind of validation , e.g. If-modified-since, it will use the cache directly, so there should not be any 304 in my server log. Since I have check with both IE6 and IE7 and can confirm this, unless user press F5 for reload, 304 will be sent out. However, I still don't belive 50% of my users will press F5 for normal usage and end up with 50% of 304, as compare to 200. Howard --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
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