client now ignores unsupported upgrades

lib/socket.js

@@ -364,7 +364,7 @@ Socket.prototype.onHandshake = function (data) {
   this.emit('handshake', data);
   this.id = data.sid;
   this.transport.query.sid = data.sid;
-  this.upgrades = data.upgrades;
+  this.upgrades = this.filterUpgrades(data.upgrades);
   this.pingInterval = data.pingInterval;
   this.pingTimeout = data.pingTimeout;
   this.onOpen();
@@ -498,6 +498,22 @@ Socket.prototype.onClose = function (reason, desc) {
   }
 };
 
+/**
+ * Filters upgrades, returning only those matching client transports.
+ * 
+ * @param {Array} server upgrades
+ * @api private
+ *
+ */
+
+Socket.prototype.filterUpgrades = function (upgrades) {
+  var filteredUpgrades = [];
+  for (var i = 0, j = upgrades.length; i<j; i++) {
+    if (~this.transports.indexOf(upgrades[i])) filteredUpgrades.push(upgrades[i]);
+  }
+  return filteredUpgrades;
+};
+
 /**
  * Generates a random uid.
  *

test/socket.js

@@ -0,0 +1,11 @@
+
+describe('Socket', function () {
+
+  describe('filterUpgrades', function () {
+    it('should return only available transports', function () {
+      var socket = new eio.Socket({'transports': ['polling']});
+      expect(socket.filterUpgrades(['polling','websocket'])).to.eql(['polling']);
+    });
+  });
+
+});