What do the parameters/query string on an image mean?

Question

I saw a few images on a certain site that linked images with a parameter.

Ex: Image was linked as //s.cdn.foobar.com/images/foobar.png?3. What does the ?3 signify on an image? I thought usually only normal HTML pages contain query strings. What is the point of having this query string on the image?

score 1 · Accepted Answer · edited May 23 '17 at 12:27

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The only use I know of for putting query strings on images is to prevent caching. Some sites put a random value in a query string for this.

Here's an older question that discusses this Disable cache for some images

edited May 23 '17 at 12:27

Community

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answered Jun 18 '14 at 22:19

Peter Wooster

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What do the parameters/query string on an image mean?

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