FIX: When You Call the Response.ClearHeaders Method in a Custom HTTPmodule, Extra Characters Are Appended to the Output

How to Obtain the Hotfix

	           Date         Time   Version       Size       File name
		   -----------------------------------------------------------------------
		   07-Jun-2003  00:44  1.1.4322.910    253,952  Aspnet_isapi.dll
		   07-Jun-2003  00:44  1.1.4322.910     20,480  Aspnet_regiis.exe
		   07-Jun-2003  00:44  1.1.4322.910     32,768  Aspnet_wp.exe
		   15-May-2003  23:49                   33,522  Installpersistsqlstate.sql
		   15-May-2003  23:49                   34,150  Installsqlstate.sql
		   07-Jun-2003  12:52  1.1.4322.910  1,216,512  System.dll
		   07-Jun-2003  00:39                   14,472  Webuivalidation.js
		   07-Jun-2003  12:52  1.1.4322.910  1,249,280  System.Web.dll

Steps to Reproduce the Behavior

1. Save the following code as Stripheader.cs, and then compile this application to Test.dll:

   using System.Web ;
   using System;
   using System.IO;
   
   namespace failed
   {
   	/// <summary>
   	/// Summary description for the stripheader.
   	/// </summary>
   	public class stripheader: IHttpModule 
   	{
   		private MyEventHandler _eventHandler = null;
   
   		public stripheader()
   		{
   			//
   			// TODO: Add constructor logic here.
   			//
   		}
   		public void Init (HttpApplication app)
   		{
   			app.PreSendRequestHeaders  += new EventHandler (onPreSend);
   		}
   
   		public void Dispose(){}
   		public delegate void MyEventHandler(Object s, EventArgs e);
   		public event MyEventHandler MyEvent
   		{
   			add { _eventHandler += value; }
   			remove { _eventHandler -= value; }
   		}
   
   		public void onPreSend(Object s, EventArgs e)
   		{
   			HttpApplication app = s as HttpApplication;
   			app.Context.Response.ClearHeaders();
   
   			if(_eventHandler!=null)
   				_eventHandler(this, null);
   		}
   	}
   	
   }

2. Use the following code to create a Test.aspx page:

   <%@ Page %>
   <%
   Response.Write ("Hello World");
   %>

3. Add a default Web.config file, and then add the following section just before the end </system.web> tag:

     <httpModules>
            <add name="failed" type="failed.stripheader, test" />
     </httpModules>

4. Copy the files that you created in steps 1, 2, and 3 to a virtual directory (vdir). Create a bin folder in this virtual directory, and then copy the Test.dll file to the bin folder.
5. View the Test.aspx page in your browser.
   
   The expected text output is "Hello World". However, the result is "b Hello World 0 ".