use socket.io default and ["polling", "websocket"]

src/controllers/api.js

@@ -13,7 +13,7 @@ var apiController = {};
 apiController.getConfig = function(req, res, next) {
 	var config = {};
 	config.relative_path = nconf.get('relative_path');
-	config.socketioTransports = nconf.get('socket.io:transports') || ['websocket', 'polling'];
+	config.socketioTransports = nconf.get('socket.io:transports') || ['polling', 'websocket'];
 	config.websocketAddress = nconf.get('socket.io:address') || '';
 	config.version = pkg.version;
 	config.siteTitle = meta.config.title || meta.config.browserTitle || 'NodeBB';

src/socket.io/index.js

@@ -33,7 +33,7 @@ Sockets.init = function(server) {
 	io.on('connection', onConnection);
 
 	io.listen(server, {
-		transports: nconf.get('socket.io:transports') || ['websocket', 'polling']
+		transports: nconf.get('socket.io:transports')
 	});
 
 	Sockets.server = io;