C# 幕後處理http POST請求類

using System;using System.IO;using System.Net;using System.Text;namespace com.hooyes.lms{    public class http    {        private const string sContentType = "application/x-www-form-urlencoded";        private const string sUserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";        private static NLog.Logger log = NLog.LogManager.GetCurrentClassLogger();        public static string Send(string data, string url)        {            return Send(Encoding.GetEncoding("UTF-8").GetBytes(data), url);        }        public static string Send(byte[] data, string url)        {            Stream responseStream;            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;            if (request == null)            {                log.Fatal(string.Format("Invalid url string: {0}", url));                throw new ApplicationException(string.Format("Invalid url string: {0}", url));            }            // request.UserAgent = sUserAgent;            request.ContentType = sContentType;            request.Method = "POST";            request.ContentLength = data.Length;            Stream requestStream = request.GetRequestStream();            requestStream.Write(data, 0, data.Length);            requestStream.Close();            try            {                responseStream = request.GetResponse().GetResponseStream();            }            catch (Exception exception)            {                log.Fatal("{0},{1}",exception.Message,exception.StackTrace);                throw exception;            }            string str = string.Empty;            using (StreamReader reader = new StreamReader(responseStream, Encoding.GetEncoding("UTF-8")))            {                str = reader.ReadToEnd();            }            responseStream.Close();            return str;        }    }}