AngularJs $http post service

angularjs-http-post-service.js

$http({
            method              :   'POST',
            url                 :   'http://localhost:3000/auth',
            headers             :   {'Content-Type': 'application/x-www-form-urlencoded'}, //THIS IS VERY IMPORTANT. By default, AngularJs uses 'Content-Type' as 'application/json'. So we have modified it here.
            transformRequest    : function(obj){                                          //This IS IMPORTANT AS WELL. when we send the data with header 'Content-Type': 'application/x-www-form-urlencoded', then we have to make sure that we send the data in serialized format (var1=val1&var2=val2). So this function transforms our data in serialized format. 

                var str = [];

                for(var p in obj)
                    str.push(encodeURIComponent(p) + "=" + encodeURIComponent(obj[p]));

                return str.join("&");
            },
            data                : {username: $scope.username, password: $scope.password}

        });