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Editorial Team
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Asked: 2026-06-16T03:17:48+00:00

In order to refresh a CSS file in cache, I often use the file.css?version=DDMMYYYY

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In order to refresh a CSS file in cache, I often use the file.css?version=DDMMYYYY trick.
However, I have a question about this method.

I’m working on an old extranet.
All pages are using the same CSS file.
The extranet doesn’t have any template file and this css is included in every page of the extranet.
I need to refresh this css file for all the extranet pages.

My question is :
I want to use the file.css?version=DDMMYYYY trick on the login page.
The other pages will still include file.css (without the ?version part)

If the user come on the login page, he will receive the new version of the css file.
But which version will be used on the other pages? The old version (file.css) or the new version (file.css?version=DDMMYYYY) ?

In other words, when the user come on the login page, which files will be in his cache :

  • file.css and file.css?version=DDMMYYYY
  • only file.css, updated to the new version

I’m sorry for this beginner question but I have some difficulties to test it myself.

Thanks for your help!

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1 Answer

  1. Editorial Team

    When the file gets cached, it will be with the full url including the ? and stuff after it. The caching headers are supplied by the server and obeyed by the browser.

    Essentially

    file.css?version=DDMMYYYY
    and
    file.css

    Are 2 separate files for the browser, with no connection what so ever.

    My suggestion to you would be to use the new url consistently on all pages.

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