Asking browsers to cache as aggressively as possible

Question

This is about a web app that serves images. Since the same request will always return the same image, I want the accessing browsers to cache the images as aggressively as po

Answer 1

There is a very important value on cache header that you have not mentioned here:

"post-check=900, pre-check=3600"

Read this article about this topic (and search for more):

http://www.rdlt.com/cache-control-post-check-pre-check.html