I need to read - in an Angular Service Class(TypeScript) - a configuration file with a base URL of a web service I consume data from. 

It is just an Ajax call with a HttpClient, but I am new to angular.

I serve my app from a **Node.js** server.

This baseUrl changes and that's why it needs to be configured. In fact, I also wanted to check if it is possible to define the base Url as a start up parameter.