C# HttpListenerRequest HttpRequestWrapper

using System;using System.Collections.Generic;using System.Collections.Specialized;using System.Diagnostics.Contracts;using System.IO;using System.Linq;using System.Net;using System.Text;namespace Rocky.Net{    public sealed class HttpRequestWrapper : System.Web.HttpRequestBase    {        internal static readonly string[] SystemHeaders = new string[]         {             "Accept", "Connection", "Content-Length", "Content-Type",             "Date", "Host", "Expect", "If-Modified-Since", "Range", "Transfer-Encoding","Referer", "User-Agent",             "Proxy-Connection"         };        private HttpListenerRequest _request;        public override string[] AcceptTypes        {            get { return _request.AcceptTypes; }        }        public override Encoding ContentEncoding        {            get { return _request.ContentEncoding; }            set            {                throw new NotSupportedException();            }        }        public override int ContentLength        {            get { return (int)_request.ContentLength64; }        }        public override string ContentType        {            get { return _request.ContentType; }            set            {                throw new NotSupportedException();            }        }        public override NameValueCollection Headers        {            get { return _request.Headers; }        }        public override string HttpMethod        {            get { return _request.HttpMethod; }        }        public override Stream InputStream        {            get { return _request.InputStream; }        }        public override bool IsAuthenticated        {            get { return _request.IsAuthenticated; }        }        public override bool IsLocal        {            get { return _request.IsLocal; }        }        public override bool IsSecureConnection        {            get { return _request.IsSecureConnection; }        }        public override NameValueCollection QueryString        {            get { return _request.QueryString; }        }        public override string RawUrl        {            get { return _request.RawUrl; }        }        public override Uri Url        {            get { return _request.Url; }        }        public override Uri UrlReferrer        {            get { return _request.UrlReferrer; }        }        public override string UserAgent        {            get { return _request.UserAgent; }        }        public override string UserHostAddress        {            get { return _request.UserHostAddress; }        }        public override string UserHostName        {            get { return _request.UserHostName; }        }        public override string[] UserLanguages        {            get { return _request.UserLanguages; }        }        public HttpRequestWrapper(HttpListenerRequest request)        {            Contract.Requires(request != null);            _request = request;        }    }}