C# 关于代理检测的问题(难,真的难)?
现在一个程序
通过我自已写的方法来判断是代理是否正常工作,核心代码如下:
public void Connect(string server, int port, Proxy proxy, ConnectCallBack callback){ this._client = new TcpClient(); try { this._server = server; this._port = port; this._callback = callback; this._proxy = proxy; this._client.BeginConnect(proxy.Server, proxy.Port, new AsyncCallback(this.Connected), null); } catch { }}private void Connected(IAsyncResult ar){ try { this._client.EndConnect(ar); NetworkStream stream = this._client.GetStream(); StreamWriter writer = new StreamWriter(stream); writer.WriteLine(string.Format("CONNECT {0}:{1} HTTP/1.1", this._proxy.Server, this._proxy.Port)); writer.WriteLine("Accept: */*"); writer.WriteLine("Content-Type: text/html"); writer.WriteLine("Proxy-Connection: Keep-Alive"); if (!string.IsNullOrEmpty(this._proxy.User)) { string s = this._proxy.User + ":" + this._proxy.Password; writer.WriteLine("Proxy-Authorization: Basic " + Convert.ToBase64String(Encoding.ASCII.GetBytes(s))); } writer.WriteLine("Content-length: 0"); writer.WriteLine(); writer.Flush(); bool isSuccess = false; string msg = "代理服务器错误"; StreamReader reader = new StreamReader(stream); for (string str4 = reader.ReadLine(); (str4 != null) && (str4.Length > 0); str4 = reader.ReadLine()) { if (str4.ToUpper().IndexOf("HTTP/1.0") > -1) { string[] strArray = str4.Split(new char[] { ' ' }); if (strArray.Length > 1) { if (strArray[1] == "200") { isSuccess = true; msg = "代理服务器工作正常"; } else { msg = "代理服务器错误 错误码" + strArray[1]; } } } } this._callback(isSuccess, msg); } catch (Exception) { this._callback(false, "连接代理服务器失败"); }}