1 files changed, 6 insertions, 1 deletions
diff --git a/src/Browser.js b/src/Browser.js
index d2e8608d..2a90b63f 100644
--- a/src/Browser.js
+++ b/src/Browser.js
@@ -8,6 +8,7 @@ function Browser(location, document) {
   this.expectedUrl = location.href;
   this.urlListeners = [];
   this.hoverListener = noop;
+  this.isMock = false;
 
   this.XHR = window.XMLHttpRequest || function () {
     try { return new ActiveXObject("Msxml2.XMLHTTP.6.0"); } catch (e1) {}
@@ -53,6 +54,10 @@ Browser.prototype = {
   },
 
   xhr: function(method, url, post, callback){
+    if (isFunction(post)) {
+      callback = post;
+      post = null;
+    }
     var xhr = new this.XHR();
     xhr.open(method, url, true);
     xhr.onreadystatechange = function() {
@@ -60,7 +65,7 @@ Browser.prototype = {
         callback(xhr.status || 200, xhr.responseText);
       }
     };
-    xhr.send('');
+    xhr.send(post || '');
   },
 
   watchUrl: function(fn){