iOS 6 Ajax bug

As you may have read, there are some bugs in iOS 6 related to Ajax. This post explains it well. I had problems getting the " $.ajaxSetup " option to work, even though I didn't spend much time diagnosing it. Same with " $.ajaxPrefilter " ( see this post )
  While it appears that in Apache you can set the "Pragma: no-cache" just for posts on the server side, in IIS the http headers apply to all methods.
  I opted for creating a specific HTTP module that sets headers to disable client caching for certain specific requests. Here is the C# code:


    using System;
    using System.Web;
    using System.Text.RegularExpressions;

    ///

    /// HttpModule responsible for setting headers to disable cache in case of posts from iPad+iOS6+Safari. This environment may cache Ajax posts. 
    ///
    public class HttpNoCacheModule : IHttpModule
    {
        // user agent regular expression to capture Safari on iPad iOS 6
        private Regex ios6Regex = new Regex(@"iPad.+OS 6.+Safari", RegexOptions.IgnoreCase);

        public void Dispose()
        {            
        }

        public void Init(HttpApplication app)
        {            
            app.EndRequest += new EventHandler(this.OnEndRequest);            
        }

        private void OnEndRequest(Object source, EventArgs e)
        {
            HttpApplication application = (HttpApplication)source;
            HttpContext context = application.Context;
            if (ios6Regex.IsMatch(context.Request.UserAgent))
            {
                if ("POST".Equals(context.Request.HttpMethod))
                {
                    context.Response.Cache.SetCacheability(HttpCacheability.NoCache);
                    context.Response.AddHeader("pragma", "no-cache");
                    context.Response.CacheControl = "no-cache";
                }
            }
        }
        
    }