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Interceptors in Angular

Crate a class that implements 'HttpInterceptor' and add @Injectable decorator to it.

The 'HttpInterceptor' interface allows you to modify all the incoming or outgoing HTTP Requests in your Angular App.

HTTP Interceptors turn out to be useful while -- caching various responses from servers, modifying HTTP headres, logging information, etc.

HTTP Interceptor interface came in the Angualr version 4.3.

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