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我已經使用System.Net和System.Net.Sockets的同步方法和類在C＃中編寫了一個簡單的代理服務器。大部分的事情都完成了，除了一個小故障。簡單代理服務器故障排除
當我從代理客戶端（比如說www.google.com）瀏覽一個url時，它會打開。當我做一個關鍵字搜索，太好了。但是，當我點擊搜索結果時，客戶再次在屏幕上看到google.com主頁！但是，客戶端瀏覽器url欄仍然顯示單擊的搜索結果url。 也許這是發生，因爲谷歌結果頁面不提供直接鏈接到結果url，而是一個鏈接到谷歌本身，我認爲我的代碼中的繼電器邏輯無法處理。你能幫我解決這個問題嗎？我的代碼如下： （該ThreadHandleClient（）方法是最重要的一個是處理所有的客戶端請求和繼電器請求和響應）
public void Start(IPAddress ip, int port)
{
try
{
TcpListener listener = new TcpListener(ip, port);
listener.Start(100);
while (!stopFlag)
{
Socket client = listener.AcceptSocket();
IPEndPoint rep = (IPEndPoint)client.RemoteEndPoint;
Thread th = new Thread(ThreadHandleClient);
th.Start(client);
}
listener.Stop();
}
catch (Exception ex)
{
Debug.Print("START: " + ex.Message);
}
}
public void Stop()
{
stopFlag = true;
}
public void ThreadHandleClient(object o)
{
try
{
Socket client = (Socket)o;
Debug.Print("lingerstate=" + client.LingerState.Enabled.ToString() + " timeout=" + client.LingerState.LingerTime.ToString());
NetworkStream ns = new NetworkStream(client);
//RECEIVE CLIENT DATA
byte[] buffer = new byte[2048];
int rec = 0, sent = 0, transferred = 0, rport = 0;
string data = "";
do
{
rec = ns.Read(buffer, 0, buffer.Length);
data += Encoding.ASCII.GetString(buffer, 0, rec);
} while (rec == buffer.Length);
//PARSE DESTINATION AND SEND REQUEST
string line = data.Replace("\r\n", "\n").Split(new string[] { "\n" }, StringSplitOptions.None)[0];
Uri uri = new Uri(line.Split(new string[] { " " }, StringSplitOptions.None)[1]);
Debug.Print("CLIENT REQUEST RECEIVED: " + uri.OriginalString);
if (uri.Scheme == "https")
{
rport = 443;
Debug.Print("HTTPS - 443");
//rq = HttpVersion + " 200 Connection established\r\nProxy-Agent: Prahlad`s Proxy Server\r\n\r\n";
//ClientSocket.BeginSend(Encoding.ASCII.GetBytes(rq), 0, rq.Length, SocketFlags.None, new AsyncCallback(this.OnOkSent), ClientSocket);
}
else
{
rport = 80;
Debug.Print("HTTP - 443");
}
IPHostEntry rh = Dns.GetHostEntry(uri.Host);
Socket webserver = new Socket(rh.AddressList[0].AddressFamily, SocketType.Stream, ProtocolType.IP);
webserver.Connect(new IPEndPoint(rh.AddressList[0], rport));
byte[] databytes = Encoding.ASCII.GetBytes(data);
webserver.Send(databytes, databytes.Length, SocketFlags.None);
Debug.Print("SENT TO SERVER. WILL NOW RELAY: " + data);
//START RELAY
buffer = new byte[2048];
bool firstTime = true;
rec = 0;
data = "";
do
{
transferred = 0;
do
{
if (webserver.Poll((firstTime ? 9000 : 2000) * 1000, SelectMode.SelectRead))
{
rec = webserver.Receive(buffer, buffer.Length, SocketFlags.None);
Debug.Print("RECEIVED FROM WEBSERVER[" + rec.ToString() + "]: " + Encoding.ASCII.GetString(buffer, 0, rec));
firstTime = false;
sent = client.Send(buffer, rec, SocketFlags.None);
Debug.Print("SENT TO CLIENT[" + sent.ToString() + "]: " + Encoding.ASCII.GetString(buffer, 0, rec));
transferred += rec;
}
else
{
Debug.Print("No data polled from webserver");
}
} while (rec == buffer.Length);
Debug.Print("loop-1 finished");
//if (transferred == 0)
// break;
//transferred = 0;
rec = 0;
do
{
if (client.Poll(1000 * 1000, SelectMode.SelectRead))
{
rec = client.Receive(buffer, buffer.Length, SocketFlags.None);
Debug.Print("RECEIVED FROM CLIENT: " + Encoding.ASCII.GetString(buffer, 0, rec));
sent = webserver.Send(buffer, rec, SocketFlags.None);
Debug.Print("SENT TO WEBSERVER[" + sent.ToString() + "]: " + Encoding.ASCII.GetString(buffer, 0, rec));
transferred += rec;
}
else
{
Debug.Print("No data polled from client");
}
} while (rec == buffer.Length);
Debug.Print("loop-2 finished");
} while (transferred > 0);
Debug.Print("LOOP ENDS. EXITING THREAD");
client.Close();
webserver.Close();
}
catch (Exception ex)
{
Debug.Print("Error occured: " + ex.Message);
}
finally {
Debug.Print("Client thread closed");
}
}