How to specify HTTP expiration header? (ASP.NET MVC+IIS)

Question

I am already using output caching in my ASP.NET MVC application.

Page speed tells me to specify HTTP cache expiration for css and images in the response header.

Answer 1

Found it:

I need to specify client cache for static content (in web.config).

<configuration>
  <system.webServer>
    <staticContent>
      <clientCache cacheControlCustom="public" 
      cacheControlMaxAge="12:00:00" cacheControlMode="UseMaxAge" />
    </staticContent>
   </system.webServer>
</configuration>

from http://www.iis.net/ConfigReference/system.webServer/staticContent/clientCache

Answer 2

Look at mini static content delivery project. :)

Answer 3

If you want to do it from code for a resource that you're returning (ie. not a static file being served from IIS), you're better off using Response.Cache:

Response.Cache.SetExpires(DateTime.Now.AddYears(1));
Response.Cache.SetCacheability(HttpCacheability.Public);

I know that's not exactly what you're asking for, but I found this question via Google and figure others might like this answer as it's related to the APIs you show in the original question text.