Problem connecting to YahooStock Quote server using TCPClient

Question

Hi,

I believe this could simply be a syntax error and I would appreciate any help with this. I am able to, using the HTTPWebRequest object to connect to the YahooStock Quote server and retrieve the data I need. However, when I try doing the same using TCPClient and the GET string below

string request = @"GET /q?s=" + Symbol+ "&d=v1 HTTP/1.0" + "\r\n" + "\r\n";

I am unable to return the same response which I expect.  I suspect that the string above may be the problem since I am able to connect but just keep getting a Http 404 response. Any idea how I can do this better please?

Thanks in advance!

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Answer 1

Get a tracelog (see instructions in my signature) and compare the request sent between the HttpWebRequest and TcpClient scenarios.

But I suspect it is because you are not adding the host header.

I would send the request as

GET /q?s=<symbol>&d=v1 HTTP/1.0\r\n

Host: finance.yahoo.com\r\n

\r\n

good luck

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feroze
--
My blog
Instruction on how to create a tracelog with your System.Net application

Answer 2

The host was the problem. I guess I needed to set the server as download.finance.yahoo.com

     public YahooStockQuoteClient()
        {
            client = null;
            networkstream = null;
           // ServerAddress = "finance.yahoo.com";
            <strong>ServerAddress = "download.finance.yahoo.com";</strong>
            portnum = 80;
        }

        public void ConnectToServer(String quotecode)
        {
            try
            {
                string request = <strong>"GET /d/quotes.csv?f=sd1t1l1c1&e=.cvs&s=" + quotecode +  "\r\n";</strong>
                //convert input to bytes
                inputstream = Encoding.UTF8.GetBytes(request);
                client = new TcpClient(ServerAddress, portnum);
                networkstream = client.GetStream();
                
                //send request to server via the networkstream object connection 
                networkstream.BeginWrite(inputstream, 0, inputstream.Length, new AsyncCallback(this.SendCompletedCallback), networkstream);
                processReturnMessage();
            }
            catch (ArgumentNullException e)
            {
                Console.WriteLine("ArgumentNullException: {0}", e);
            }
            catch (SocketException e)
            {
                Console.WriteLine("SocketException: {0}", e);
            }

        }

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