Joining promises

app.js

app.controller('SomeController', ['$http', function($http) {

        var requestA = function () {
            $http.post('http://incoming.example.com:9000/v1.0/oauth1/request-token', {})
                    .success(function(data) {
                        ...
                    })
                    .error(function(data, status) {
                        ...
                    });
        };
      
        var requestB = function() {
             $http.get('http://incoming.example.com:9000/v1.0/authentication/access-token')
             .success(function(data) {
                 ...
             })
             .error(function(data, status) {
                 ...
             });
        };

        requestA();
        requestB();
    } ]);