Cache.SetMaxAge not working under IIS, works fine under VS Dev Srv

UPDATE: 2011-03-14 The fix is ensure you call SetSlidingExpiration(true)

context.Response.Cache.SetCacheability(HttpCacheability.Public);context.Response.Cache.SetMaxAge(TimeSpan.FromMinutes(5));context.Response.ContentType = "image/jpeg";context.Response.Cache.SetSlidingExpiration(true);

If you remove the OutputCache module you will get the desired result. I see this as a bug.

So, in your web.config you would do the following:

  <system.webServer>      <modules runAllManagedModulesForAllRequests="true">          <remove name="OutputCache"/>      </modules>  </system.webServer>

ADDED: So, there's additional information.

1. Using MVC's OutputCacheAttribute apparently doesn't have this issue
2. Under the same MVC application, without removing "OutputCache" from the modules, a direct implementation if IHttpHandler or an ActionResult results in the s-maxage being stripped

The following strips the s-maxage

         public void ProcessRequest(HttpContext context)    {        using (var image = ImageUtil.RenderImage("called from IHttpHandler direct", 5, DateTime.Now))        {            context.Response.Cache.SetCacheability(HttpCacheability.Public);            context.Response.Cache.SetMaxAge(TimeSpan.FromMinutes(5));            context.Response.ContentType = "image/jpeg";            image.Save(context.Response.OutputStream, ImageFormat.Jpeg);        }                }

The following strips the s-maxage

          public ActionResult Image2()    {        MemoryStream oStream = new MemoryStream();        using (Bitmap obmp = ImageUtil.RenderImage("Respone.Cache.Setxx calls", 5, DateTime.Now))        {            obmp.Save(oStream, ImageFormat.Jpeg);            oStream.Position = 0;            Response.Cache.SetCacheability(HttpCacheability.Public);            Response.Cache.SetMaxAge(TimeSpan.FromMinutes(5));            return new FileStreamResult(oStream, "image/jpeg");        }    }

This does NOT - go figure...

    [OutputCache(Location = OutputCacheLocation.Any, Duration = 300)]    public ActionResult Image1()    {        MemoryStream oStream = new MemoryStream();        using (Bitmap obmp = ImageUtil.RenderImage("called with OutputCacheAttribute", 5, DateTime.Now))        {            obmp.Save(oStream, ImageFormat.Jpeg);            oStream.Position = 0;            return new FileStreamResult(oStream, "image/jpeg");        }    }

Solution:

in web.config:

    <staticContent>      <clientCache cacheControlCustom="public" cacheControlMode="UseMaxAge" cacheControlMaxAge="1.00:00:00"/>    </staticContent>

and en IIS PC:

With cmd go to c:\windows\system32\inetsrv.

Then execute:

appcmd unlock config /section:staticContent

Belated answered but this could help someone :-

Response.Cache.SetProxyMaxAge(TimeSpan.Zero);