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Why pass a query parameter to an image file (/img/button.png?123456789) from inside a HTML page?

Answer 1

+2 A:

It forces the browser to skip its cache, and retrieve a fresh copy from the server.

Lekensteyn 2010-08-27 16:49:38

It forces the browser not to use its own cache?

LowFatTwinkie 2010-08-27 16:58:03

Yes. That's useful when a website gets a new design for example.

Lekensteyn 2010-08-27 17:00:27

But if they change the number at each session, for example, the browser has to load new images every time, which seems like a loss of efficiency for the user and puts more bandwidth strain on the servers.

LowFatTwinkie 2010-08-27 17:04:33

That's true. If an image has to be regenerated every time, it should be done in this way. But if it doesn't have to be regenerated every time, then it's an error from the web developer.

Lekensteyn 2010-08-27 17:14:18

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Why pass a query parameter to an image file (/img/button.png?123456789) from inside a HTML page?

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