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HttpInterceptor -  HttpInterceptors is an interface which uses to implement the intercept method. Intercepts HttpRequest and handles them. Intercepts is an advanced feature that allows us to intercept each request/response and modify it before sending/receiving. Interceptors capture every request and manipulate it before sending and also catch every response and process it before completing the call. Firstly, we can implement own interceptor service and this service will “catch” each request and append an Authorization header. You can see in the following example, import { Injectable } from '@angular/core' ; import { HttpEvent , HttpInterceptor , HttpHandler , HttpRequest } from '@angular/common/http' ; @ Injectable () export class MyInterceptor implements HttpInterceptor {   //Intercepts HttpRequest and handles them.   intercept ( req : HttpRequest < any >, next : HttpHandler ): Observable < HttpEvent < any >>...

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 ...