Simple handshake demo for [RFC 6455]

client.js

(function() {
   // 注:Firefox 11.0已经去掉了WebSocket对象特有前缀
   var ws = new WebSocket('ws://localhost:8888');
   ws.onopen = function(e){
     // ws.send('Client message!!');
   }
   ws.onmessage = function(e) {
     // TODO
   };

   ws.onclose = function() {
     // TODO
   }; 
})();

ws_server.js

/**
 * WebSocket服务器测试程序
 * Surpport [RFC 6455] only
 * I just want a pure WebSocket Server which could run in Nodejs.
 * No client code jam, no Hixie or IETF, no flash etc, just for fun! 
 */
var util = require("util")
    ,net = require("net")
    ,http = require("http")
    ,crypto = require('crypto')
    ,buffer = require('buffer')
    ,PORT = 8888
    ,CRLF = '\r\n'
    ,MAGIC = '258EAFA5-E914-47DA-95CA-C5AB0DC85B11'
    ;

function createServer(){
    return new WebSocketServer();
};

function WebSocketServer(){
    var server = this;
    http.Server.call(server);

    server.addListener("connection", function(socket){
	// TODO requests_recv++;
    });

    server.addListener("request", function(req, res){
	res.writeHead(200, {"Content-Type": "text/plain"});
	res.write("okay");
	res.end();
    });
  
    /**
     * Client handshake listener 
     */
    server.addListener("upgrade", function(req, socket, upgradeHead){
	var key = req.headers['sec-websocket-key'];
	var shasum = crypto.createHash('sha1');
	key = shasum.update(key + MAGIC);
	key = shasum.digest('base64');


	var respHeaders = [
	      'HTTP/1.1 101 Switching Protocols'
	    , 'Upgrade: websocket'
	    , 'Connection: Upgrade'
	    , 'Sec-WebSocket-Accept: ' + key
	];
	
	// 响应头最后要以2个CRLF结尾[RFC6455]
	socket.write(respHeaders.concat('','').join(CRLF));
    });
};

/**
 * 继承http.Server
 * 监听 request|connection|upgrade 事件
 */
util.inherits(WebSocketServer, http.Server);

var server = createServer();
server.listen(PORT, function(){
    console.log('server started at port 8888...');
});