Question

Hi I am trying to send a simple HTTP message from Flex to C# server, but it seems that I am getting tow calls, first is the real one and the second is an empty one.

Why is that and how can I handle it?

This is my C# code:

TcpListener listener = new TcpListener(IPAddress.Any, 9400);
listener.Start();
Console.WriteLine("Server started");
Socket client;
while (true)
{
    client = listener.AcceptSocket();
    // client.Available is an expensive call so it's just for testing
    Console.WriteLine("Client accepted " + client.Connected + " " + client.Available);
    SocketHandler handler = new SocketHandler();
    ThreadPool.QueueUserWorkItem(handler.handleSocket, client);
} 

this is the SocketHandler:

public void handleSocket(object socketObjeck)
{
    try
    {
        socket = (Socket)socketObjeck;
        byte[] buffer = new byte[1024];
        SocketSettings.setSocket(socket);
        //blocker...
        try
        {
            socket.Receive(buffer);
        }
        catch (Exception e)
        {
            Console.WriteLine("Error\nFaild reading from socket\n" + e.Message);
            socket.Close();
            return;
        }
        parseData(buffer);

        socket.Close(3);
    }
    catch (Exception e)
    {
        Console.WriteLine("Error\nError \n" + e.Message + "\n" + e.StackTrace);
    }
}

And this is my flex code:

var request:URLRequest = new URLRequest();
request.data = "Hello from flex";
request.url = URL;
request.method = URLRequestMethod.POST;
loader.load(request);

I am always getting 2 calls.
The line:

Console.WriteLine("Client accepted " + client.Connected + " " + client.Available);

called twice.
What am I missing?

Edit 1:
I can tell you for sure that the second call is empty, it’s not even seen in chrome JavaScript console, it’s like flex opening a connection, and waiting for some response or I don’t know what… but it sending no data.

Edit 2:

I been trying to send a true HTTP response a notice another thing, the second call is coming without waiting for the first call, if I am putting the response thread to short sleep(100 milliseconds in my test) then I am getting the second call before I been able to response for the first one.

P.S
Using Flex 4.6, Visual Studio 2010

Answer 1

After all it turn around that it were the crossdomain request. If you do not adding a crossdomain file in you www folder, flex will send you an empty message(if you will try to response this message with crossdomain, it want work).