► Interceptors are a unique type of Angular Service that we can implement. Interceptors allow us to intercept incoming or outgoing HTTP requests using the HttpClient. By intercepting the HTTP request, we can modify or change the value of the request.

We can perform various operation using interceptors like:
•
► Modifying HTTP Headers
► Modifying request body
► Interceptors can be used to set authentication and authorization token.
► If you want to mock the backend API, there also interceptors are life saver.
►
If you want to modify thee response, like you got the response in XML and want to convert it to JSON, Interceptors are helpful.
►We can leverage Interceptors to also handle HTTP errors

So Useful things we can do with Http Interceptors are endless
Please check the complete tutorial on :
►HTTP Service:    • HTTP Service - Angular (Tutorial #18)  
► Immutable/Mutable:    • ES6 Tutorial #5: Mutable and Immutabl...  

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