javascript - NodeJS + AngularJS - after some time, I get net::ERR_CONNECTION_RESET -


i'm using express nodejs , angularjs in front-end. after click here, add data there, update record here, show list there, net::err_connection_reset. it's strange, after 8 or 9 navigations through application, got error. before this, ajax calls doing fine.

an example of angularjs controller:

app.controller('grupocontroller', ['$scope', '$location', '$routeparams', 'gruposervice',      function ($scope, $location, $routeparams, gruposervice) {      $scope.carregardependenciasmeusgrupos = function () {         gruposervice.carregardependenciasmeusgrupos().then(function (result) {             $scope.data = {                 grupos: result.data             };         });     };      $scope.editargrupo = function(grupo) {         $location.path('/editar-grupo/' + grupo.id);     }; }]);

and example of http call:

function ajax(url, async, method, params, isjson, showloading) {     var deferred = $q.defer();     $http.post('http://localhost:3000' + url, params).success(function(result) {          if (result.statuscode === 403) {             $location.path('/login');         } else {             if (result.success) {                 deferred.resolve(result);             } else {                 deferred.reject();                 if (result.errormessage) {                     alert(result.errormessage);                 }                  if (result.redirectto) {                     window.location.href = result.redirectto;                 }             }         }     }).error(function(err) {         deferred.reject();     });      return deferred.promise; }

this approach i'm using express , nodejs create action called through ajax method above:

app.post('/grupos/get-dependencies-to-grupos', app.ensureauthentication, function(request, response, next) {     query.openconnection().then(function(connection) {          var gruposrepository = new repositories.grupos(connection);         gruposrepository.getdependenciastogrupos(             request.headers["authorization"], request.body.grupoid)             .then(function(result) {                 response.json({ statuscode: 200, data: result });         }, function(getdependencieserror) {                 response.json({ statuscode: 500, errormessage: getdependencieserror });         });    }); });

after 8 or 9 navigations, app stopped work suddenly. can guys me? thank you!

what happens if "getdependenciastogrupos" promise result error, don't have "catch".

so if in error, there no http response server (nodejs), , browser, after waiting responses few requests, shuts down connexion.

try add catch handler promise : 

gruposrepository.getdependenciastogrupos(             request.headers["authorization"], request.body.grupoid)             .then(function(result) {                 response.json({ statuscode: 200, data: result })              .catch(function(error){response.json({ statuscode: 503, data: error})});

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