Some browsers will not correctly cache URLs with a query, it's better to have the version be part of the URL. Here's what I did to one site:

I have the javascript in a folder called /js/ and I have a symbolic link to that folder with the version number, so the application spits out:

<script src="/js4/foo.js"></script>

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In reply to Re^2: cache js code, but detect when it's changed? by Chady
in thread cache js code, but detect when it's changed? by bcrowell2

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