Revert "Fixed "Invalid argument to getAgent" when proxying HTTP"

This reverts commit 642e158.

lib/node-http-proxy.js

@@ -45,9 +45,11 @@ exports.version = [0, 5, 0];
 // and sets the `maxSockets` property appropriately.
 //
 function _getAgent (host, port, secure) {
-  var options = { host: host, port: port };
-  var agent = !secure ? http.getAgent(options) : https.getAgent(options);
-
+  var agent = !secure ? http.getAgent(host, port) : https.getAgent({ 
+    host: host, 
+    port: port 
+  });
+
   agent.maxSockets = maxSockets;
   return agent;
 }
@@ -666,4 +668,4 @@ HttpProxy.prototype.proxyWebSocketRequest = function (req, socket, head, options
   if (options.buffer && !errState) {
     options.buffer.resume();
   }
-};
+};