Caching images with asp/http

[bledar88]

I want to cache all the images on my site, so I used this code:\[code\]<%Response.AddHeader "Expires","Tue, 2 October 2013 00:00:00 GMT"%>\[/code\]The problem is that google says the images are not cached, whenever I go to this site:\[code\]https://developers.google.com/speed/pagespeed\[/code\]Also in chrome, I can see that it gives a Get response for all the images.Why is that and how can I cache the images for the next year.