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:

<system.web> 
    <caching>
        <outputCache omitVaryStar="true" />
    </caching>
</system.web> 

Answer 2

Use an ASHX generic handler and use the HttpRuntimeCache (Cache object) to do the job as Codebrain said. It will be faster and WAY more flexible.

Answer 3

Try dropping the Response.End() as this will terminate the thread prematurely and prevent output caching from taking place.

See: http://bytes.com/groups/net-asp/323363-cache-varybyparam-doesnt-work

You may wish to consider using an ASHX handler and using your own caching method.