What is the best way to trigger a refresh of a cached CSS file on a JSP website, without using PHP?

I am currently making significant changes to my site by modifying a CSS file. Is there a way to compel clients to refresh the CSS in order to see the new updates? Unfortunately, it is not feasible to ask thousands of people to manually reload the page using CTRL + F5 or clear their cache. I have come across some information on blogs suggesting that adding today's date to the CSS filename as a parameter could potentially solve this issue.

Answer №1

If you want to ensure your CSS file is always up-to-date, consider adding a unique query string parameter to the end of the URL.

<link rel="stylesheet" type="text/css" href="/my/css/file.css?456" />

Simply increment the number each time you make changes to the file.

UPDATE:

To dynamically load the CSS file from the web.xml, include the following code:

<link rel="stylesheet" type="text/css" href="/my/css/file.css?<%=application.getInitParamer("cssBuildNumber")%>" />

Make sure to define the parameter in the web.xml like this:

<context-param>
   <param-name>cssBuildNumber</param-name>
   <param-value>456</param-value>
</context-param>

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