Prevent Client Side Caching with HttpModules
I am attempting to build a totally anonymous feedback system here at work and so I needed to find a way to prevent clients from caching any data coming off the server. I started out by just putting in the standard cache killing code in the actual pages I was using but then I realized that this didn’t prevent the image, css, and javascript files from being cached off the server. So to solve this issue I just made a little HttpModule to prevent caching of any content coming off the server. Here is the code:
using System;
using System.Web;
namespace TT.Web.HttpModules
{
///
/// HttpModule to prevent caching
///
public class NoCacheModule : IHttpModule
{
public NoCacheModule()
{
}
#region IHttpModule Members
public void Init(HttpApplication context)
{
context.EndRequest += (new EventHandler(this.Application_EndRequest));
}
public void Dispose()
{
}
private void Application_EndRequest(Object source, EventArgs e)
{
HttpApplication application = (HttpApplication)source;
HttpContext context = application.Context;
context.Response.ExpiresAbsolute = DateTime.Now.AddDays( -100 );
context.Response.AddHeader( “pragma”, “no-cache” );
context.Response.AddHeader( “cache-control”, “private” );
context.Response.CacheControl = “no-cache”;
}
#endregion
}
}
The last thing to try and tackle would be preventing the pages from showing up in history as well… but I doubt there is anything I can do about that.
Have you tried SmartNavigation?
(This might provide what you’re looking for (although it’s IE 5.5+)
Thanks for that, just what I was looking for.
this is useful too
http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.9.1