ASPX That Returns An Image - Output Cache-able?

Question

Greetings!

I\'ve created an APSX web form that returns a remote image based on some supplied parameters. It can be used like this:

Answer 1

Your problem could be a bug in IE - it can't cache if the Vary:* HTTP response header is used, but IIS returns it by default because it's in the HTTP 1.1 spec.

Try adding the following to your web.config: