AZBlocker

Class1.cs

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

namespace AZBlocker
{
    /// <summary>
    /// *.azurewebsites.net access blocker
    /// </summary>
    public class Class1 : IHttpModule
    {
        private HttpApplication App;
        private bool isMatched = false;

        public void Init(HttpApplication context)
        {
            App = context;
            context.PreRequestHandlerExecute += new EventHandler(OnPreRequestHandlerExecute);
            context.PreSendRequestHeaders += new EventHandler(OnPreSendRequestHeaders);
            context.PreSendRequestContent += new EventHandler(OnPreSendRequestContent);
        }

        private void OnPreRequestHandlerExecute(object sender, EventArgs e)
        {
            string hostName = HttpContext.Current.Request.Url.Host;
            // HttpContext.Current.Response.Headers.Add("Name", hostName);
            if (!String.IsNullOrEmpty(hostName))
            {
                try
                {
                    Regex regx = new Regex(@"^(.*).azurewebsites.net$");
                    // Regex regx = new Regex(@"^localhost$");
                    if (regx.IsMatch(hostName))
                    {
                        // App.Response.Redirect("/"); // ERR_TOO_MANY_REDIRECTS: 
                        // App.Response.Redirect("javascript:"); // Running javascript scheme at Top-level is prohibited.
                        // App.Response.Redirect("script:"); // Firefox say: http Unknown protocol
                        // App.Response.Close(); // ERR_CONNECTION_RESET: Connection reset
                        // App.Response.End(); // throw ThreadAbortException
                        // App.Context.Session.Timeout = 0; // Exception
                        // App.CompleteRequest(); // Safety?

                        // For Azure Web Service
                        App.Response.StatusCode = 302;
                        HttpContext.Current.Response.Headers.Add("Location", "script:");
                        isMatched = true;
                    }
                } catch (Exception)
                {
                    throw;
                }
            }
        }

        private void OnPreSendRequestHeaders(object sender, EventArgs e)
        {
            if (isMatched)
            {
                HttpContext.Current.Response.Headers.Remove("Server");
                HttpContext.Current.Response.Headers.Remove("Content-Type");
                HttpContext.Current.Response.Headers.Remove("Last-Modified");
                HttpContext.Current.Response.Headers.Remove("Etag");
                HttpContext.Current.Response.Headers.Remove("Accept-Ranges");
                HttpContext.Current.Response.Headers.Remove("X-AspNet-Version");
                HttpContext.Current.Response.Headers.Remove("X-AspNetMvc-Version");
            }
        }

        private void OnPreSendRequestContent(object sender, EventArgs e)
        {
            if (isMatched)
            {
                App.Context.Response.ClearContent();
            }
        }

        public void Dispose()
        {
        }
    }
}