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POPOCO 1.5.1 Websocket client unable to connect to c# websocket server
 

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  1. POPOCO 1.5.1 Websocket client unable to connect to c# websocket server
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    <p>Problem:</p> <p>A websocket client(POCO 1.5.1, c++) will not connect to a websocket c# server (command line app with Fleck Library). A <strong>timeout</strong> is reached with an exception thrown:</p> <pre><code>Cannot upgrade to WebSocket connection: OK Exception Code: 1 Poco WebException Documentation WS_ERR_NO_HANDSHAKE = 1 : No Connection: Upgrade or Upgrade: websocket header in handshake request. </code></pre> <p><em>Fact 1</em>: This <strong>websocket client</strong> will connect to a <strong>Ruby Event Machine</strong> websocket server.</p> <p><em>Fact 2</em>: A <strong>javascript client</strong> will connect to the <strong>websocket c# server</strong>.</p> <p><em>Fact 3</em>: The same <strong>javascript client</strong> will also connect to the <strong>websocket ruby server</strong>.</p> <p><em>Fact 4</em>: The <strong>websocket client</strong> will not connect to an <strong>Alchemy Websocket server</strong> neigther. <a href="https://github.com/Olivine-Labs/Alchemy-Websockets" rel="nofollow">https://github.com/Olivine-Labs/Alchemy-Websockets</a></p> <p>Update with Wireshark POCO is using <strong>GET / HTTP/1.0\r\n</strong></p> <p>Javascript version: <strong>GET / HTTP/1.1\r\n</strong></p> <hr> <h1>All Source Code</h1> <h2>Client code in c++</h2> <pre><code>#include "Game.h" #include &lt;irrlicht.h&gt; #include "driverChoice.h" #include &lt;iostream&gt; #include &lt;assert.h&gt; #include "Poco/Net/WebSocket.h" #include "Poco/Net/HTTPClientSession.h" #include "Poco/Net/HTTPRequest.h" #include "Poco/Net/HTTPResponse.h" #include "Poco/Net/ServerSocket.h" #include "Poco/Net/NetException.h" #include "Poco/Exception.h" using Poco::Net::HTTPClientSession; using Poco::Net::HTTPRequest; using Poco::Net::HTTPResponse; using Poco::Net::HTTPServerRequest; using Poco::Net::HTTPServerResponse; using Poco::Net::WebSocket; using Poco::Net::WebSocketException; using Poco::Exception; // VS2010 // POCO 1.5.1 // Irrlicht 3D engine // Windows 7 Enterprise edition Game::Game(void) { } Game::~Game(void) { } //... void Game::TestWebSocketClient() { char buffer[1024]; int flags; int n; std::string payload; try { HTTPClientSession cs("localhost", 8080); HTTPRequest request(HTTPRequest::HTTP_GET, "/ws"); HTTPResponse response; std::string cmd; WebSocket * ws = new WebSocket(cs, request, response); // Causes the timeout payload = "SGClient: Hello World!"; ws-&gt;sendFrame(payload.data(), payload.size(), WebSocket::FRAME_TEXT); n = ws-&gt;receiveFrame(buffer, sizeof(buffer), flags); while( cmd != "exit") { cmd = ""; std::cin &gt;&gt; cmd; ws-&gt;sendFrame(cmd.data(), cmd.size(), WebSocket::FRAME_TEXT); n = ws-&gt;receiveFrame(buffer, sizeof(buffer), flags); if( n &gt; 0 ) { std::cout &lt;&lt; buffer &lt;&lt; std::endl; } } ws-&gt;shutdown(); } catch (Exception ex) { return; } </code></pre> <h2>Server code in c#</h2> <pre><code>// vs2010 // fleck library // Windows 7 enterprise edition using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Collections; using Fleck; using System.Timers; namespace TestWebsocket { class Program { static void Main() { FleckLog.Level = LogLevel.Debug; var allSockets = new List&lt;IWebSocketConnection&gt;(); var server = new WebSocketServer("ws://localhost:8080"); server.Start(socket =&gt; { socket.OnOpen = () =&gt; { Console.WriteLine("Open!"); allSockets.Add(socket); }; socket.OnClose = () =&gt; { Console.WriteLine("Close!"); allSockets.Remove(socket); }; socket.OnMessage = message =&gt; { Console.WriteLine(message); allSockets.ToList().ForEach(s =&gt; s.Send("Echo: " + message)); }; }); var input = Console.ReadLine(); while (input != "exit") { foreach (var socket in allSockets.ToList()) { socket.Send(input); } input = Console.ReadLine(); } } } } </code></pre> <h2>Alternate HTML/Javascript client code, running in Chrome Version 31.0.1650.57 m</h2> <pre><code>&lt;!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"&gt; &lt;html&gt; &lt;head&gt; &lt;title&gt;websocket client&lt;/title&gt; &lt;script type="text/javascript"&gt; var start = function () { var inc = document.getElementById('incomming'); var wsImpl = window.WebSocket || window.MozWebSocket; var form = document.getElementById('sendForm'); var input = document.getElementById('sendText'); inc.innerHTML += "connecting to server ..&lt;br/&gt;"; // create a new websocket and connect window.ws = new wsImpl('ws://localhost:8080/'); // when data is comming from the server, this metod is called ws.onmessage = function (evt) { inc.innerHTML += evt.data + '&lt;br/&gt;'; }; // when the connection is established, this method is called ws.onopen = function () { inc.innerHTML += '.. connection open&lt;br/&gt;'; }; // when the connection is closed, this method is called ws.onclose = function () { inc.innerHTML += '.. connection closed&lt;br/&gt;'; } form.addEventListener('submit', function(e){ e.preventDefault(); var val = input.value; ws.send(val); input.value = ""; }); } window.onload = start; &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;form id="sendForm"&gt; &lt;input id="sendText" placeholder="Text to send" /&gt; &lt;/form&gt; &lt;pre id="incomming"&gt;&lt;/pre&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <h2>Alternate ruby server code using eventmachine running on command line interface</h2> <pre><code>// Ruby 1.9 // gem install em-websocket required. require 'em-websocket' EventMachine::WebSocket.start(:host =&gt; "localhost", :port =&gt; 8080) do |ws| ws.onopen { ws.send "RS: Hello Client!"} ws.onmessage { |msg| ws.send "RS: Pong: #{msg}" puts msg } ws.onclose { puts "WebSocket closed" } end </code></pre>
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    1. USRichard Lalancette
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      1. POPOCO 1.5.1 Websocket client unable to connect to c# websocket server
      1. USRichard Lalancette
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    1. COWhat is the exact error code you get and where are you getting it from?
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      1. USPhillip Kinkade
    2. COInterestingly, the server detects the client connecting before the client timesout. >>> 24/11/2013 4:30:01 PM [Debug] Client connected from 127.0.0.1:64699 24/11/2013 4:30:01 PM [Debug] 155 bytes read
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      1. POPOCO 1.5.1 Websocket client unable to connect to c# websocket server
      1. USRichard Lalancette
    3. COCross-referencing with POCO Exception documentation: WS_ERR_NO_HANDSHAKE = 1 No Connection: Upgrade or Upgrade: websocket header in handshake request.
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      1. POPOCO 1.5.1 Websocket client unable to connect to c# websocket server
      1. USRichard Lalancette
 

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