Change Interest.interestLifetime to be milliseconds (not seconds).
diff --git a/js/ndnProtocol/components/ndnProtocolService.js b/js/ndnProtocol/components/ndnProtocolService.js
index 8641755..3f630e8 100644
--- a/js/ndnProtocol/components/ndnProtocolService.js
+++ b/js/ndnProtocol/components/ndnProtocolService.js
@@ -57,7 +57,7 @@
     

             var template = new Interest(new Name([]));

             // Use the same default as NDN.expressInterest.

-            template.interestLifetime = 4.0;

+            template.interestLifetime = 4000; // milliseconds

             var searchWithoutNdn = extractNdnSearch(search, template);

     

             var requestContent = function(contentListener) {