.NET socket webserver HTTP POST request body

Question

I am doing an embedded project in C# and I have written a socket based web server. Everything works well, except I can't for the life of me get the request body. Content-Length says that there is 12 characters, but the socket.Recieve method only gets the headers.

while (true)
{

    using (Socket clientSocket = listeningSocket.Accept())
    {
        IPEndPoint clientIP = clientSocket.RemoteEndPoint as IPEndPoint;
        Debug.Print("Received request from " + clientIP.ToString());
        var x = clientSocket.RemoteEndPoint;

        int availableBytes = clientSocket.Available;

        Debug.Print(DateTime.Now.ToString() + " " + availableBytes.ToString() + " request bytes available");

        int bytesReceived = (availableBytes > maxRequestSize ? maxRequestSize : availableBytes);
        if (bytesReceived > 0)
        {
            byte[] buffer = new byte[bytesReceived]; // Buffer probably should be larger than this.
            int readByteCount = clientSocket.Receive(buffer, bytesReceived, SocketFlags.None);

            using (Request r = new Request(clientSocket, Encoding.UTF8.GetChars(buffer)))
            {
                Debug.Print(DateTime.Now.ToString() + " " + r.URL);
                if (requestReceived != null) requestReceived(r);

            }


        }
    }
    Thread.Sleep(10);
}

availableBytes = 499

bytesReceived = 499

readByteCount = 487 (12 characters short)

What am I missing here? The body is multipart form data if that makes any difference.

Just in terms of investigation, do you get a different readByteCount if you use SocketFlags.Peek ? — Russ Clarke, Aug 10 '11 at 13:35
You might want to use my embeddable web server: http://webserver.codeplex.com. It's free and is coded in C# — jgauffin, Aug 10 '11 at 14:25

score 1 · Accepted Answer · edited May 23 '17 at 12:11

1

int bytesReceived = (availableBytes > maxRequestSize ? maxRequestSize : availableBytes);

If maxRequestSize is 487, then you will get the results you describe.

Also remember Content-Length is not bytes - it's octets: What's the "Content-Length" field in HTTP header? (OK I'm being pedantic - and octet is 8 bits ;))

edited May 23 '17 at 12:11

Community

1
1

answered Aug 10 '11 at 13:40

Kieren Johnstone

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MaxRequestSize is 1000, I know what you are saying about the length...but the bytes aren't coming in... – Chris Kooken Aug 10 '11 at 13:45
Why are you using the OutOfBand flag, by the way? – Kieren Johnstone Aug 10 '11 at 13:59

score 0 · Answer 2 · answered Aug 10 '11 at 14:23

0

I wonder how reliable that Available property is. It looks like it's only useful for non-blocking sockets, and then only as a boolean flag saying that something is available.

Why not just read the stream in a loop parsing messages as you go?

answered Aug 10 '11 at 14:23

Nikolai Fetissov

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Can you give me an example doing it this way? – Chris Kooken Aug 10 '11 at 14:58
Start here http://download.oracle.com/javase/tutorial/networking/sockets/clientServer.html. HTTP is sort of involved protocol. You probably don't want doing it by hand the first time around. – Nikolai Fetissov Aug 10 '11 at 15:06

.NET socket webserver HTTP POST request body

2 Answers2