WhitespaceModule.cs

public class WhitespaceModule : IHttpModule
{
    public void Dispose() { }

    public void Init(HttpApplication context)
    {
        context.BeginRequest += Context_BeginRequest;
    }

    private void Context_BeginRequest(object sender, EventArgs e)
    {
        HttpApplication app = sender as HttpApplication;
        app.Response.Filter = new WhitespaceFilter(app.Response.Filter);            
    }
}