user-controller.js

freezeApp.controller('UserController', function UserController($scope, userService) {
  
  $scope.update = function() {
    userService.update($scope.user).success(function() {
      // it worked!!
    });
  };

});

user-service.js

freezeApp.service('userService', function userService($http) {
 
  findAll = function() {
    return $http.get('/api/users');
  };
 
  findById = function(id) {
    return $http.get('/api/users/' + id);
  };
 
  create = function(user) {
    return $http.post('/api/users', user);
  };
 
  update = function(user) {
    return $http.put('/api/users', user);
  };
 
  delete = function(id) {
    return $http.delete('/api/users/' + id);
  };
 
});

I'm not sure this works, I'm just trying to show an example.