使用TcpClient可避免HttpWebRequest的常见错误

有时使用HttpWebRequest对象会出现错误，总结有三种：

 

1、System.Net.WebException: 服务器提交了协议冲突. Section=ResponseStatusLine

 

2、System.Net.WebException: 基础连接已经关闭: 连接被意外关闭。

3、System.Net.ProtocolViolationException: 无法发送具有此谓词类型的内容正文。

使用TcpClient对象搞定：

 

private string GetHTMLTCP(string URL)
        {
            string strHTML = "";//用来保存获得的HTML代码

            TcpClient clientSocket = new TcpClient();

            Uri URI = new Uri(URL);

            clientSocket.Connect(URI.Host, URI.Port);

            StringBuilder RequestHeaders = new StringBuilder();//用来保存HTML协议头部信息

            RequestHeaders.AppendFormat("{0} {1} HTTP/1.1\r\n", "GET", URI.PathAndQuery);

            RequestHeaders.AppendFormat("Connection:close\r\n");

            RequestHeaders.AppendFormat("Host:{0}\r\n", URI.Host);

            RequestHeaders.AppendFormat("Accept:*/*\r\n");

            RequestHeaders.AppendFormat("Accept-Language:zh-cn\r\n");

            RequestHeaders.AppendFormat("User-Agent:Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)\r\n\r\n");

            Encoding encoding = Encoding.Default;

            byte[] request = encoding.GetBytes(RequestHeaders.ToString());

            clientSocket.Client.Send(request);

            //获取要保存的网络流
            Stream readStream = clientSocket.GetStream();

            StreamReader sr = new StreamReader(readStream, Encoding.Default);

            strHTML = sr.ReadToEnd();

            readStream.Close();

            clientSocket.Close();

            return strHTML;
        }