Is it possible to set the cache for JS and CSS files only based on some logic?

When the url of the assets always changes (e.g SignUp.[versiontoken].css when the content is modified) then the cache settings can be (1 year) Cache-Control: max-age=31536000

When the url is static (e.g /ui/some.css) then the cache should be short (<1day).

For the first scenario, I think is enough to add Cache-control in the web.config, but for the second one, what should I do?

        <remove name="Cache-Control" />
        <add name="Cache-Control" value="public, max-age=31536000" />

Project: Sitecore 9.3 based on Helix architecture, no SXA

  • Can you give us more information? Like what Sitecore version are you using? How have you setup your JS/CSS? Is this SXA/JSS/Classic MVC? Based on your tags, if this is just static files on your server, then this is not the right place, you'd be better asking on Stack Overflow.
    – Richard Seal
    Commented Feb 23, 2022 at 13:58

1 Answer 1


Based on your question it seems like these are static assets on your server which are perhaps generated by a frontend build process. I'm having a similar requirement and use an outbound rewrite rule to accomplish this, see sample below. Another approach would be to set this in Application_BeginRequest.

    <rule name="Set long cache time" preCondition="SetLongCache">
        <match serverVariable="RESPONSE_cache-control" pattern="(.*)" />
        <action type="Rewrite" value="max-age=31536000" />
        <!-- Change condition to meet your requirement -->
        <preCondition name="SetLongCache" >
            <add input="{HTTP_URL}" pattern="SignUp\.(.*)\.css" />
  • This is actually good. Is not quite what I need, but it helped a lot. Thanks
    – iusmar
    Commented Feb 25, 2022 at 16:35

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