Why do use like this filename.css?2 or filename.js?4 What are those numbers after question mark?
I did research online but I didn't find any answer.
Thanks!
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It is revision numbers or cache busters as listed below. When people release a new version of their javascript, they increment this by one to force people to grab the latest version of their JS.Kyle Muir– Kyle Muir2014-09-08 22:58:28 +00:00Commented Sep 8, 2014 at 22:58
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You say you did research online, yet when I copy/paste the first line of your question into Google, we get the answer: stackoverflow.com/questions/4044085/… Odd.cookie monster– cookie monster2014-09-08 23:08:48 +00:00Commented Sep 8, 2014 at 23:08
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2 Answers
These are called cache busters.
Usually, when a browser downloads a file (CSS, JS, etc.) it caches it so that it doesn't have to download it later.
However, this is a problem when you decide to update your file, because the browser thinks it already has the latest version. To work around it, we use the cache busters. When you make a change to the file, you also change the number after the question marks, which tricks the browser into thinking this is a different file for which it doesn't have a cache it, and forces a re-download.
14 Comments
rmobis
@C-link Nepal, mind telling what is wrong?
rmobis
They say pretty much what I said. So, again, do you mind pointing exactly what is wrong?
rmobis
If you read carefully, that's exactly what I said.
rmobis
But that's what it does. I'm not saying it is because of the cache buster, I'm simply saying the browser does it. I'd recommend you read it more carefully.
rmobis
OK, you clearly can't interpret what I'm saying. Never mind then.
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Sometimes JS scripts are created on the fly using server side technologies other times it is simply a version number to help with browser caching issues
