Web Reference: TL;DR: Interceptors are middleware that allows common patterns around retrying, caching, logging, and authentication to be abstracted away from individual requests. HttpClient supports two kinds of interceptors: functional and DI-based. Http interceptor is already implemented in Angular 4.3.4 and is described in the documentation. You need to implement the intercept method of HttpInterceptor interface, do something with the request, and call the next.handle(req) method. To implement an interceptor, declare a class that implements the intercept() method of the HttpInterceptorinterface. Here is a do-nothing noopinterceptor that passes the request through without touching it: The intercept method transforms a request into an Observablethat eventually returns the HTTP response.In this sense, each interceptor is fully ...
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