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I notice that the Craft admin pages append random query parameters to their static files, i.e. jquery-2.2.1.min.js?x=AKVKl03So:

example network data from admin, showing query parameters

This prevents those static files being cached in browsers, which can make the admin views unreliable in less-than-optimal network conditions.

I see the logic to make this happen is in Craft's app/helpers/UrlHelper.php

Is there a sane way to deactivate that behavior, and allow browsers to cache Craft's static files?

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I don't think it's a great idea to disable this cache busting; they put it in there for a reason. However, if you really need/want to do it, instead of modifying Craft, I'd just configure Apache/Nginx to discard the query string for paths that match /admin/resources/

https://wiki.apache.org/httpd/RewriteQueryString

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  • Thanks! That would do the job, but I agree that it's probably not a great idea - future changes to static files won't appear in users' browsers because of the caching. What I'd really love is a way to trigger that $dateParam logic for all the static files, so that they deterministic ?d= query parameters instead of random ?x= query parameters, thus getting both browser-side caching and also graceful cache invalidation when updates happen. – Chris MacDonald Aug 22 '16 at 17:54
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    If you're going through the trouble of dropping the query string, theoretically you could setup how far out the cache should be on the admin side as well, say an hour or 2 depending on how long your authors are in the site for. – RitterKnight Aug 23 '16 at 5:11

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