One of the major new features in Angular 4.3 is the HttpClient module

A complete rewrite of the old Http module bringing three significant improvements:

Progress events to track both request upload and response download.
Responses provide access to a .json attribute that makes away with the requirement of explicit parsing the textual response.
A new generic mechanism to handle requests and responses using interceptors. To build an interceptor, you declare a class that implements the HttpInterceptor interface, then you chain it to the other interceptors responsible to handle the request or response.
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