proposal to set no cache in headers

assets/js/router.js

@@ -3,10 +3,14 @@ function UrlExists(url, cb) {
         url:      url,
         dataType: 'text',
         type:     'GET',
-        cache:    false,
         complete:  function(xhr){
             if(typeof cb === 'function')
             cb.apply(this, [xhr.status]);
+        },
+        headers: {
+            'Cache-Control': 'no-cache, no-store, must-revalidate',
+            'Pragma': 'no-cache',
+            'Expires': '0'
         }
     });
 }