所有源代码

Question

问题：

websocket客户端（POCO 1.5.1，c ++）不会连接到websocket c＃服务器（带有Fleck库的命令行应用程序）。抛出异常时达到超时：

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.

事实1 ：此 websocket客户端将连接到 Ruby Event Machine websocket服务器。

事实2 ： javascript客户端将连接到 websocket c＃server 。

事实3 ：同样的 javascript客户端也将连接到 websocket ruby服务器。

事实4 ： websocket客户端不会连接到 Alchemy Websocket服务器 neigther。 https://github.com/Olivine-Labs/Alchemy-Websockets

使用Wireshark进行更新 POCO正在使用 GET / HTTP / 1.0 \ r \ n

Javascript版本： GET / HTTP / 1.1 \ r \ n

所有源代码

c ++中的客户端代码

#include "Game.h"

#include <irrlicht.h>
#include "driverChoice.h"
#include <iostream>
#include <assert.h>

#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->sendFrame(payload.data(), payload.size(), WebSocket::FRAME_TEXT);
      n = ws->receiveFrame(buffer, sizeof(buffer), flags);

      while( cmd != "exit")
      {
        cmd = "";
        std::cin >> cmd;
        ws->sendFrame(cmd.data(), cmd.size(), WebSocket::FRAME_TEXT);
        n = ws->receiveFrame(buffer, sizeof(buffer), flags);
        if( n > 0 )
        {
            std::cout << buffer << std::endl;
        }
      }

      ws->shutdown();
  }
  catch (Exception ex)
  {
      return;
  }

c＃

中的服务器代码

// 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<IWebSocketConnection>();
            var server = new WebSocketServer("ws://localhost:8080");
            server.Start(socket =>
            {
                socket.OnOpen = () =>
                {
                    Console.WriteLine("Open!");
                    allSockets.Add(socket);
                };
                socket.OnClose = () =>
                {
                    Console.WriteLine("Close!");
                    allSockets.Remove(socket);
                };
                socket.OnMessage = message =>
                {
                    Console.WriteLine(message);
                    allSockets.ToList().ForEach(s => s.Send("Echo: " + message));
                };
            });

            var input = Console.ReadLine();
            while (input != "exit")
            {
                foreach (var socket in allSockets.ToList())
                {
                    socket.Send(input);
                }
                input = Console.ReadLine();
            }

        }
    }
}

备用HTML / Javascript客户端代码，在Chrome版本31.0.1650.57 m

中运行

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
    <title>websocket client</title>
    <script type="text/javascript">
        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 ..<br/>";

            // 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 + '<br/>';
            };

            // when the connection is established, this method is called
            ws.onopen = function () {
                inc.innerHTML += '.. connection open<br/>';
            };

            // when the connection is closed, this method is called
            ws.onclose = function () {
                inc.innerHTML += '.. connection closed<br/>';
            }

            form.addEventListener('submit', function(e){
                e.preventDefault();
                var val = input.value;
                ws.send(val);
                input.value = "";
            });

        }
        window.onload = start;
    </script>
</head>
<body>
    <form id="sendForm">
        <input id="sendText" placeholder="Text to send" />
    </form>
    <pre id="incomming"></pre>
</body>
</html>

使用在命令行界面

上运行的eventmachine的备用ruby服务器代码

// Ruby 1.9
// gem install em-websocket required.
require 'em-websocket'

EventMachine::WebSocket.start(:host => "localhost", :port => 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

Answer 1

问题是POCO默认的HTTP请求版本是1.0。

RFC规范的4.1节指出最小值为1.1：

http://tools.ietf.org/html/rfc6455#section-4.1

请求的方法必须是GET，HTTP版本必须       至少1.1。       例如，如果WebSocket URI是“ws：//example.com/chat”，       发送的第一行应为“GET / chat HTTP / 1.1”。

通过以下方式替换HTTPRequest构造解决了问题：

HTTPRequest request(HTTPRequest::HTTP_GET, "/ws", "HTTP/1.1" );

干杯！

POCO 1.5.1 Websocket客户端无法连接到c＃websocket服务器

所有源代码

c ++中的客户端代码

c＃

备用HTML / Javascript客户端代码，在Chrome版本31.0.1650.57 m

使用在命令行界面

1 个答案: