[refactor minor] Update vendor/websocket.js to be compatible with node@0.6.x

vendor/websocket.js

@@ -496,7 +496,7 @@ var WebSocket = function(url, proto, opts) {
         if (u.protocol === 'ws:' || u.protocol === 'wss:') {
             protocol = u.protocol === 'ws:' ? http : https;
             port = u.protocol === 'ws:' ? 80 : 443;
-            agent = u.protocol === 'ws:' ? protocol.getAgent(u.hostname, u.port || port) : protocol.getAgent({
+            agent = u.protocol === new protocol.Agent({
               host: u.hostname,
               port: u.port || port
             });
@@ -514,8 +514,20 @@ var WebSocket = function(url, proto, opts) {
             throw new Error('Invalid URL scheme \'' + urlScheme + '\' specified.');
         }
         
-        if (!agent._events || agent._events['upgrade'].length === 0) {
-            agent.on('upgrade', (function() {
+        var httpReq = protocol.request({
+          host: u.hostname,
+          method: 'GET',
+          agent: agent,
+          port: u.port,
+          path: httpPath, 
+          headers: httpHeaders
+        });
+        
+        httpReq.on('error', function (e) {
+            errorListener(e);
+        });
+        
+        httpReq.on('upgrade', (function() {
             var data = undefined;
 
             return function(res, s, head) {
@@ -607,20 +619,6 @@ var WebSocket = function(url, proto, opts) {
                 stream.emit('data', head);
             };
         })());
-        }
-        
-        agent.on('error', function (e) {
-            errorListener(e);
-        });
-
-        var httpReq = protocol.request({
-          host: u.hostname,
-          method: 'GET',
-          agent: agent,
-          port: u.port,
-          path: httpPath, 
-          headers: httpHeaders
-        });
         
         httpReq.write(challenge, 'binary');
         httpReq.end();