AngularJS: Preserve Content-Type header with Restangular

better.js

(function () {
    'use strict';
    
    angular.module('myApp', ['restangular'])
        .config(httpConfig)
    ;
    
    function httpConfig($httpProvider) {
        $httpProvider.interceptors.unshift(interceptor); // use unshift to run before Restangular's interceptor

        function interceptor() {
            return {
                request : requestInterceptor
            };

            function requestInterceptor(config) {
                if (angular.isDefined(config.headers['Content-Type']) && !angular.isDefined(config.data))
                    config.data = '';

                return config;
            }
        }
    }
    
});

good.js

(function () {
    'use strict';
    
    angular.module('myApp', ['restangular'])
        .config(restangularConfig)
    ;
    
    function restangularConfig(RestangularProvider) {
        RestangularProvider
            .addFullRequestInterceptor(preserveContentTypeHeader)
        ;
        
        function preserveContentTypeHeader(element, operation, route, url, headers, params, httpConfig) {
            if (angular.isDefined(headers['Content-Type']) && !angular.isDefined(httpConfig.data))
                    httpConfig.data = '';
        }
    }
    
})();

Do you really need Restangular over $http? It would seem like such a common task for Angular to have to send Content-Type headers. What does Restangular have that $http doesnt?