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Let’s say I cache my CSS file and set their expiry date to a month from now. Suppose I have some updates and so modify the CSS file. How can I ensure that visitors to my website will be using the updated CSS instead of the old one?
Thanks.
You could change the name which would ensure that regardless of users browsers, they would get the new file. In all places you reference the CSS file, reference a variable containing the file name instead. When you release a new version, update the variable so all pages look at the new stylesheet.