XmlHttpHandler.cs

XMLHttpHandler.cs

public class MySuperDuperHandler : IHttpHandler
{
    public void ProcessRequest(HttpContext context)
    {
        var configService = new ConfigService();
        var page = new OutputCachedPage(new OutputCacheParameters
        {
            Duration = 300, // in seconds
            Location = OutputCacheLocation.Server,
            VaryByParam = "None"
        });
        page.ProcessRequest(HttpContext.Current);
            
        XDocument doc = GetXmlData();
            
        context.Response.ContentType = "text/xml";
        context.Response.ContentEncoding = System.Text.Encoding.UTF8;
        context.Response.Expires = -1;
        context.Response.Cache.SetAllowResponseInBrowserHistory(true);

        doc.Save(context.Response.Output); 
    }

    public bool IsReusable
    {
        get { return false; }
    }

   /// <summary>
   /// Code required for server-side caching
   /// </summary>
   private sealed class OutputCachedPage : Page
   {
        private readonly OutputCacheParameters cacheSettings;

        public OutputCachedPage(OutputCacheParameters cacheSettings)
        {
            // Tracing requires Page IDs to be unique.
            ID = Guid.NewGuid().ToString();
            this.cacheSettings = cacheSettings;
        }

        protected override void FrameworkInitialize()
        {
            base.FrameworkInitialize();
            InitOutputCache(cacheSettings);
        }
    }
}