使用TcpClient可避免HttpWebRequest的常見錯誤

有時使用HttpWebRequest對象會出現錯誤，總結有三種：

 

1、System.Net.WebException: 服務器提交了協議衝突. Section=ResponseStatusLine

 

2、System.Net.WebException: 基礎連接已經關閉: 連接被意外關閉。

3、System.Net.ProtocolViolationException: 無法發送具有此謂詞類型的內容正文。

使用TcpClient對象搞定：

 

private string GetHTMLTCP(string URL)
        {
            string strHTML = "";//用來保存獲得的HTML代碼

            TcpClient clientSocket = new TcpClient();

            Uri URI = new Uri(URL);

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

            StringBuilder RequestHeaders = new StringBuilder();//用來保存HTML協議頭部信息

            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);

            //獲取要保存的網絡流
            Stream readStream = clientSocket.GetStream();

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

            strHTML = sr.ReadToEnd();

            readStream.Close();

            clientSocket.Close();

            return strHTML;
        }