What are Http Interceptors?

Http Interceptors are part of @angular/common/http, which inspect and transform HTTP requests from your application to the server and vice-versa on HTTP responses. These interceptors can perform a variety of implicit tasks, from authentication to logging.

The syntax of HttpInterceptor interface looks like as below,

interface HttpInterceptor {
intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>>;
}

You can use interceptors by declaring a service class that implements the intercept() method of the HttpInterceptor interface.

@Injectable()
export class MyInterceptor implements HttpInterceptor {
constructor() {}
intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
...
}
}

After that you can use it in your module,

@NgModule({
...
providers: [
{
provide: HTTP_INTERCEPTORS,
useClass: MyInterceptor,
multi: true
}
]
...
})
export class AppModule {}

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Made by Michael Sakhniuk

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