Cache Control Headers with IIS 7.5

Posted by Brad on Server Fault See other posts from Server Fault or by Brad
Published on 2012-12-07T22:28:22Z Indexed on 2012/12/07 23:09 UTC
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iis7.5

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cache

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http-headers

I'm trying to wrap my head around client side (web browser) caching and how it works in relation to IIS 7.5 cache control headers.

In particular:

If we want to force clients to reload cached resources, how must IIS be configured?
Do we need to set expire web content immediately if the resources on the server have a more recent Modified Date (or ETag value)?
Right now we're not setting any cache headers. So if I set a cache header of no-cache (which I think is the equivalent of expire web content immediately) will that force the web browser to obtain a new version of a particular file. Or will the browser only request a new version after it deems its current copy to be stale and then from that point forward not cache it?

Would a best practice be to set a cache control flag of 1 week, then 8 days before I know I am going to make a change set the cache control down to for instance 30 minutes?

But if I do that and then need to immediately expire an item from users caches because there was an issue with it how do I do that?

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