Fixes for IE 6 and Android 2.3.

 - Exclude iframe transports which require SockJS-client
    to be served by Yeti.
 - Exclude xhr-streaming transport on Android UAs for
    faster connection startup.
 - Increase RTT for IE 6.
 - Cool down for 1 second after every test page for IE 6.

lib/hub/view/public/inject.js

@@ -117,8 +117,8 @@
     window.$yetify = function $yetify(firstRunConfiguration) {
 
         var win = window,
+            ie6 = navigator.userAgent.indexOf("IE 6.") !== -1,
             resultAttempts = 0,
-            tower = $yetify.tower,
             Runner = null;
 
         function sendResults() {
@@ -127,7 +127,7 @@
             }
             resultAttempts += 1;
             status("Sending results, attempt " + resultAttempts + "...");
-            tower.emit("results", $yetify.results);
+            $yetify.tower.emit("results", $yetify.results);
             $yetify.sendResultTimeout = win.setTimeout(sendResults, 5000);
         }
 
@@ -139,6 +139,8 @@
             var io = win.io,
                 resource = config.mountpoint,
                 sock,
+                protocols,
+                rtt,
                 tower;
 
             if (resource === "/") {
@@ -147,7 +149,41 @@
 
             status("Connecting...");
 
-            sock = new SockJS(getSockURL(resource, "tower"));
+            // iframe protocols are not used here, because
+            // the SockJS server needs to serve iframes
+            // using the same SockJS client JS as the parent.
+            //
+            // Currently, it's being served from the internet
+            // instead of by Yeti, so Yeti needs to serve
+            // the sock.js by itself before these can be
+            // enabled.
+            protocols = [
+                "websocket",
+                "xdr-streaming",
+                // "iframe-eventsource",
+                // "iframe-htmlfile",
+                "xdr-polling",
+                "xhr-polling",
+                // "iframe-xhr-polling",
+                "jsonp-polling"
+            ];
+
+            if (navigator.userAgent.indexOf("Android") === -1) {
+                // Android 2.x timeouts for xhr-streaming,
+                // use it on other platforms.
+                protocols.push("xhr-streaming");
+            }
+
+            if (ie6) {
+                // IE 6 needs a longer RTT.
+                rtt = 2000;
+                // Leave it undefined for other browsers.
+            }
+
+            console.log("protos: " + protocols.join(","));
+            sock = new SockJS(getSockURL(resource, "tower"), null, {
+                protocols_whitelist: protocols
+            });
             tower = $yetify.tower = new SimpleEvents(sock);
 
             tower.queueUntil("listening");
@@ -167,9 +203,19 @@
             };
 
             tower.on("navigate", function (test) {
+                var navigateTimeout = 10;
+
                 $yetify.complete = true;
                 clearTimeout($yetify.sendResultTimeout);
-                document.location.href = test;
+
+                if (ie6) {
+                    status("Cooling down for 1 second.");
+                    navigateTimeout = 1000;
+                }
+
+                win.setTimeout(function () {
+                    document.location.href = test;
+                }, navigateTimeout);
             });
 
             tower.on("listening", function () {
@@ -208,7 +254,9 @@
         function beat() {
             var element = document.getElementById("yeti-beat");
             reportCarelessErrors();
-            tower.emit("beat");
+            // Sending heartbeats is noisy and we don't yet use them.
+            // Let SockJS keep the connection alive.
+            // $yetify.tower.emit("beat");
             heartbeats += 1;
             if (element) {
                 element.innerHTML = heartbeats;