Okay, I wrote it... but I'm guessing that I'm only seeing the headers being sent from the client to the server. I guess first I should ask if there are other headers to be seen? What about the headers that are being sent from the server to the client- like a response.redirect/302? I'm interested in seeing those, too. Here's the code for the ShowHTTPHandlers.cs ...

using System;
using System.Web;
using System.Collections.Specialized;


namespace mypractice01
{
	/// 
	/// Displays HTTP method, and count of Headers collection
	/// 
	public class ShowHTTPHeaders : IHttpModule
	{
		public void Init (HttpApplication Application)
		{
			Application.EndRequest += new EventHandler(Application_EndRequest);
		}
		private void Application_EndRequest(object sender, EventArgs e)
		{
			HttpApplication Application = (HttpApplication) sender;
			Application.Context.Response.Write("HTTP Method is: " + Application.Context.Request.HttpMethod + "
");
			Application.Context.Response.Write("Header count is: " + Application.Context.Request.Headers.Count + "
");


			Application.Context.Response.Write("
");
		

			

			/* Begin quick & dirty paste from MSDN */
			int loop1, loop2;
			NameValueCollection coll;
			// Load Header collection into NameValueCollection object.
			coll=Application.Context.Request.Headers;
			// Put the names of all keys into a string array.
			String[] arr1 = coll.AllKeys;
			for (loop1 = 0; loop1<arr1.Length; loop1++)
			{
				Application.Context.Response.Write("Key: " + arr1[loop1] + "
");
				// Get all values under this key.
				String[] arr2=coll.GetValues(arr1[loop1]);
				for (loop2 = 0; loop2<arr2.Length; loop2++)
				{
					Application.Context.Response.Write("Value " + loop2 + ": " + arr2[loop2] + "
");
				}
			}
			/* End of quick & dirty paste from MSDN */
		

	

		}


		public void Dispose()
		{}


	}
}

And here's the section I added to my app's config.web file:

And here's how I built the DLL, which I copied into the webapp's bin directory:

C:\WINNT\Microsoft.NET\Framework\v1.1.4322>csc /t:library /r:System.dll,System.Web.dll \\testserver1\wwwroot$\mypractice01\ShowHTTPHeaders.cs

Finally, here's a sample of what I'm seeing at the end of each page:

HTTP Method is: GET
Header count is: 9

Key: Cache-Control
Value 0: no-cache
Key: Connection
Value 0: Keep-Alive
Key: Accept
Value 0: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-powerpoint, application/vnd.ms-excel, application/msword, */*
Key: Accept-Encoding
Value 0: gzip, deflate
Key: Accept-Language
Value 0: en-us
Key: Cookie
Value 0: ASP.NET_SessionId=prc32w5ahtnjxsg5rkaas213
Key: Host
Value 0: testserver1
Key: Referer
Value 0: http://testserver1/mypractice01/WebForm3.aspx
Key: User-Agent
Value 0: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; .NET CLR 1.1.4322)

Now if I could see what the server sends to the browser, I think I'll be happy. Is streaming to a text file a good solution? (This is just for practice/learning, none of this will be used in the final version.) Or should I maybe store the header info in the Session state, and retrieve it with a separate aspx page? Is it even possible to see what the server sends to the browser? Like I said, I want to see the 302/Redirect command appear in my output.