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Compressing HTTP output with an HttpModule (C#)

using System; using System.Collections.Generic; using System.Text; using System.Web; using System.IO; using System.IO.Compression; namespace ClassLibrary1 {     public class Class1 : IHttpModule     {         void IHttpModule.Dispose()         {             throw new Exception("The method or operation is not implemented.");         }         void IHttpModule.Init(HttpApplication context)         {             context.BeginRequest += new EventHandler(context_BeginRequest);         }         void context_BeginRequest(object sender, EventArgs e)         {             HttpApplication app = (HttpApplication)sender;             string encodings = app.Request.Headers.Get("Accept-Encoding");             if (encodings == null)                 return;             Stream s = app.Response.Filter;             encodings = encodings.ToLower();             if (encodings.Contains("gzip"))             {                 app.Response.Filter = new GZipStream(s, CompressionMode.Compress);                 app.Response.AppendHeader("Content-Encoding", "gzip");                 app.Context.Trace.Warn("GZIP Compression on");             }             else             {                 app.Response.Filter =                               new DeflateStream(s, CompressionMode.Compress);                 app.Response.AppendHeader("Content-Encoding", "deflate");                 app.Context.Trace.Warn("Deflate Compression on");             }         }     } }