Small note.

lib/core/resolvers/UrlResolver.js

@@ -83,6 +83,8 @@ UrlResolver.prototype._hasNew = function (canonicalDir, pkgMeta) {
         return !mout.object.equals(oldCacheHeaders, cacheHeaders);
     }.bind(this), function () {
         // Assume new contents if the request failed
+        // Note that we do not retry the request using the "request-replay" module
+        // because it would take too long
         return true;
     });
 };