$http({
      method: 'POST',
      url: 'http://localhost:8000/api/v1/user/user_signin',
      headers: {
           'Content-Type': application/json
         },
      data: { username: $scope.user.username, password: $scope.user.password }
    }).then(function(returnData) {

         console.log('success');
         $scope.result = returnData.data.salt;
         console.log($scope.result);

      }, function errorCallback(returnData) {

         console.log('error');
         console.log(returnData);

      });