Its a well known feature, but I always manage to get a aha! everytime I talk about it.
Simply specifying a bogus query string at the end of a image url will force the browser to retrieve the file from the server, instead of the cache. Very useful when testing/developing graphics.
E.g.
Let’s say we have a NFS graph at this URL: http://yourname.blogsome.com/images/nfswrites.gif in your browser’s cache. In order to get the most recent version of the image from the server, simply specify a random query string at the end of the url
for e.g, all these URLS will load the image from the server on all occasions.. not from the cache.
http://yourname.blogsome.com/images/nfswrites.gif?A
http://yourname.blogsome.com/images/nfswrites.gif?b
http://yourname.blogsome.com/images/nfswrites.gif?c
http://yourname.blogsome.com/images/nfswrites.gif?d
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