anchor.diff:          app.get("/queries-mongo").listen((request) {
             
             var queries = _parseQueriesParam(request.param("queries"));
  +
  +          _setJsonHeaders(request.response);
             
             Future.wait(
                 new List.generate(
  
positive.code:         
          // Mongo query test
          app.get("/db-mongo").listen((request) {
            _mongoQuery().then((data) {
              request.response.json({
                "id": data["id"],
  
negative.code:         // Mongo updates test
          app.get("/updates-mongo").listen((request) {
            var queries = _parseQueriesParam(request.param("queries"));
  
            _setJsonHeaders(request.response);
  
            Future.wait(new List.generate(queries, (index) {
              return _mongoQuery()
                  .then((world) {
  