Fixes connection optimization for IE.

connection_optimization/external_connect.js

         }
     };
 
+    xhttp.open("GET", webserviceUrl, true);
+
+    // Fixes external connect for IE
+    // The timeout property may be set only after calling the open() method
+    // and before calling the send() method.
     xhttp.timeout = 3000;
 
-    xhttp.open("GET", webserviceUrl, true);
     window.connectionTimes = {};
     var now = window.connectionTimes["external_connect.sending"] =
         window.performance.now();