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I'm working on an asp.net website. I need to make sure my javascript and css updates will be immediately available for returning visitors, without them having to clear their cache to get the latest code. How can I force this when needed, and leave it alone on other occasions?

Thanks in advance.

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Stackoverflow does this very elegantly IMO. You can see in there source there is a query-string variable passed.

<script type="text/javascript" src="http://sstatic.net/js/stub.js?v=778aaf5a38e2"></script>

This will force new load if that changes.

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Using the old "version number in query string" trick really is the way to fly.
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In order to reliably force a refresh of cached content on the browser you need to change the name / requested URL of the file somehow.

Often this is done by appending a query string to the URL (which is often ignored)

See When Does Browser Automatically Clear JavaScript Cache? for a more complete discussion.

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You'll need to apply no-cache header to those resources, alternatively make the url dynamic somehow.

see - http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html

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