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    <p>A few things to be aware of using your suggested architecture:</p> <p><a href="https://stackoverflow.com/questions/285290/trying-to-send-an-http-request-over-sockets">Trying to send an HTTP request over sockets</a></p> <p>Principally, you need to be aware that even though you can chat http at a lower level using sockets, there are a large number of cases where communication in this fashion will fail. Mainly these failures will occur if the user has a proxy server enabled in their browser, as there is no effective means of discovering and subsequently using the proxy when connecting via a socket.</p> <p>In order to make a policy server, you can use the <a href="http://msdn.microsoft.com/en-us/library/system.net.sockets.tcplistener.aspx" rel="nofollow noreferrer">TcpListener</a> class. You would start listening as follows:</p> <pre><code>var tcpListener = new TcpListener(IPAddress.Any, 843 ); tcpListener.start(); tcpListener.BeginAcceptTcpClient(new AsyncCallback(NewClientHandler), null); </code></pre> <p>The method NewClientHandler would have the form:</p> <pre><code> private void NewClientHandler(IAsyncResult ar) { TcpClient tcpClient = tcpListener.EndAcceptTcpClient(ar); ... </code></pre> <p>At which point you might want to supply the tcpClient object to a class of your own creation to handle the validation of the data coming from the socket. I'm going to call it RemoteClient.</p> <p>In RemoteClient, you'd have something like this:</p> <pre><code> var buffer=new byte[BUFFER_SIZE]; tcpClient.GetStream().BeginRead(buffer, 0, buffer.Length, Receive, null); </code></pre> <p>and a Receive method:</p> <pre><code> private void Receive(IAsyncResult ar) { int bytesRead; try { bytesRead = tcpClient.GetStream().EndRead(ar); } catch (Exception e) { //something bad happened. Cleanup required return; } if (bytesRead != 0) { char[] charBuffer = utf8Encoding.GetChars(buffer, 0, bytesRead); try { tcpClient.GetStream().BeginRead(buffer, 0, buffer.Length, Receive, null); } catch (Exception e) { //something bad happened. Cleanup required } } else { //socket closed, I think? return; } } </code></pre> <p>and some send methods:</p> <pre><code> public void Send(XmlDocument doc) { Send(doc.OuterXml); } private void Send(String str) { Byte[] sendBuf = utf8Encoding.GetBytes(str); Send(sendBuf); } private void Send(Byte[] sendBuf) { try { tcpClient.GetStream().Write(sendBuf, 0, sendBuf.Length); tcpClient.GetStream().WriteByte(0); tcpClient.GetStream().WriteByte(13); //very important to terminate XmlSocket data in this way, otherwise Flash can't read it. } catch (Exception e) { //something bad happened. cleanup? return; } } </code></pre> <p>That's all the important details I think. I wrote this some time ago... the Receive method looks like it could do with a rework, but it should be enough to get you started.</p>
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    1. POC# Socket Policy File Server for low-level AS3.0 socket connections?
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    1. COGreat - thanks for the headsup on the proxy problem as well.
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    2. COJust to be clear - the link to the SO question is about appending an extra /r/n. That hasn't got anything to do with the proxy problem you mention in the next paragraph does it ? It's two different issues to be aware of?
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    3. COCorrect. Proxy issue is different.
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