I think the traditional way is to encode the version in the URL:

<script type="text/javascript" src="/js/foo/2.37/foo.js"></script>

[download]

That way, when you need a new version, you automatically get it. You should make all older version URLs redirect to the newest version.

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

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