difference between RestangularProvider and RestangularConfigurer - angularjs

Question

I wanted to add an interceptor to my module.
Here is the intial state:
app.config(function ($stateProvider, $urlRouterProvider,RestangularProvider) {
RestangularProvider.setBaseUrl('/app/services');
});
I modified with this:
app.config(function ($stateProvider, $urlRouterProvider, RestangularProvider, RestangularConfigurer) {
RestangularProvider.setBaseUrl('/app/services');
RestangularConfigurer.addFullRequestInterceptor(function (element, operation, route, url, headers, params, httpConfig) {
if (operation === 'get'){
console.log("RestangularProvider: call to get");
params.ts= new Date();
}
return {
element: element,
headers: headers,
params: params,
httpConfig: httpConfig
};
});
});
However, I add an error:
Error: [$injector:unpr] Unknown provider: RestangularConfigurer
So I replaced RestangularConfigurer by RestangularProvider.
But I do not clearly understand how that works, and what's happening behind the scenes.
Could you explain me that ?

Answer 1

First of all there is no RestangularConfigurer module. You have only Restangular and its provider RestangularProvider.
Let's start with angularjs documentation for providers.
Please esspecially read Provider Recipe as I do not duplicate it again here.
As a summary RestangularProvider is just a recipe how Restangular api should be build as you decide it in config module there is no Restangular api yet, but you have your recipe.
On the other hand Restangular will be bootstraped after your main module bootstraped, so in config there is actually no Restangular module yet.
If you still insist using Restangular instead its provider you can use it in module#run instead of module#config.