caching - When does browser automatically clear cache of external JavaScript file? -

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i have javascript resource has possibility of being edited @ time. once edited want propagated user's browser relatively (like maybe 15 minutes or so), however, frequency of resource being editing few , far between (maybe 2 month).

i'd rather resource cached in browser, since retrieved frequently, i'd cache reset on browser @ semi-regular interval.

i know can pass no-cache header when request resource, wondering when cache automatically reset on browser if did not pass no-cache.

i imagine independent each browser, i'm not sure.

i tried google this, of hits found clearing browser's cache... isn't i'm looking for.

you may pass version string parameter url of script tag. parameter won't evaluated static javascript file force browser new version.

if not want assign version string every time edited source may compute based on file system time stamp or subversion commit number:

<script src="/script.js?time_stamp=1224147832156" type="text/javascript"></script> <script src="/script.js?svn_version=678" type="text/javascript"></script>

   


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