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

Question

I already use output caching in my ASP.NET MVC application.

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

I know that the Response object contains some properties that control the expiration of the cache. I know that these properties can be used to control HTTP caching for the response that I serve from my code:

Response.Expires Response.ExpiresAbsolute Response.CacheControl 

or alternatively

 Response.AddHeader("Expires", "Thu, 01 Dec 1994 16:00:00 GMT"); 

Question: how to set the Expires header for resources that are serviced automatically, for example. images, css, etc.

Answer 1

Found:

I need to specify a 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

If you want to do this from the code for the returned resource (i.e. not a static file served from IIS), you'd better use Response.Cache :

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

I know that it’s not quite what you are asking for, but I found this question through Google and thought that others might like this answer because it is related to the APIs that you show in the source text of the question.

Answer 3

Check out the mini static content project . :)