private static Func<IHttpContext, object> GetBinder(Type type)
{
if (type == typeof(IHttpResponse)) return c => c.Response;
else if (type == typeof(Stream)) return c => c.Response.OutputStream;
else if (type == typeof(TextWriter)) return c => c.Response.Output;
else if (type == typeof(BinaryWriter)) return c => new BinaryWriter(c.Response.OutputStream, c.Response.ContentEncoding);
else if (type == typeof(TextWriter)) return c => c.Response.Output;
else if (type == typeof(XmlWriter)) return c => System.Xml.XmlWriter.Create(c.Response.Output);
else return null;
}