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The Http Interceptor is an interface and used to implement the intercept method. ü   Stayed Informed - How To Set Authorization Headers in GET/POST Requests? Example - //Register an Interceptor (HTTP_INTERCEPTORS) in the app Module. import { NgModule } from '@angular/core' ; import { HTTP_INTERCEPTORS } from '@angular/common/http' ; @ NgModule ({   providers: [{     provide: HTTP_INTERCEPTORS ,     useClass: MyInterceptor ,     multi: true ,   }], }) export class AppModule {} And //The HttpInterceptor is an interface and used to implement the intercept method. import { Injectable } from '@angular/core' ; import { HttpEvent , HttpInterceptor , HttpHandler , HttpRequest } from '@angular/common/http' ; @ Injectable () export class MyInterceptor implements HttpInterceptor {   intercept ( req : HttpRequest < any >, next : HttpHandler ): Observable ...