In Angular 4.3, you can use multiple instances of the HttpClient with different interceptors by creating separate Angular modules and providing the instances at the module level. Here's an example of how you can achieve this:

  1. Create two interceptor classes that implement the HttpInterceptor interface. Let's call them InterceptorOne and InterceptorTwo.

    typescript
    import { Injectable } from '@angular/core'; import { HttpInterceptor, HttpRequest, HttpHandler, HttpEvent } from '@angular/common/http'; import { Observable } from 'rxjs'; @Injectable() export class InterceptorOne implements HttpInterceptor { intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> { // Intercept and modify the request as needed console.log('InterceptorOne'); return next.handle(request); } } @Injectable() export class InterceptorTwo implements HttpInterceptor { intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> { // Intercept and modify the request as needed console.log('InterceptorTwo'); return next.handle(request); } }
  2. Create two separate Angular modules, let's call them HttpClientModuleOne and HttpClientModuleTwo. In each module, provide a separate instance of HttpClient along with the corresponding interceptors.

    typescript
    import { NgModule } from '@angular/core'; import { HttpClientModule, HTTP_INTERCEPTORS } from '@angular/common/http'; import { InterceptorOne } from './interceptor-one'; @NgModule({ imports: [HttpClientModule], providers: [ { provide: HTTP_INTERCEPTORS, useClass: InterceptorOne, multi: true, }, ], }) export class HttpClientModuleOne {} import { NgModule } from '@angular/core'; import { HttpClientModule, HTTP_INTERCEPTORS } from '@angular/common/http'; import { InterceptorTwo } from './interceptor-two'; @NgModule({ imports: [HttpClientModule], providers: [ { provide: HTTP_INTERCEPTORS, useClass: InterceptorTwo, multi: true, }, ], }) export class HttpClientModuleTwo {}
  3. In your main AppModule, import both HttpClientModuleOne and HttpClientModuleTwo.

    typescript
    import { NgModule } from '@angular/core'; import { BrowserModule } from '@angular/platform-browser'; import { HttpClientModuleOne } from './http-client-module-one'; import { HttpClientModuleTwo } from './http-client-module-two'; @NgModule({ imports: [ BrowserModule, HttpClientModuleOne, HttpClientModuleTwo, ], }) export class AppModule {}
  4. Now, you can inject the HttpClient instances from the two different modules into your services or components as needed.

    typescript
    import { Injectable } from '@angular/core'; import { HttpClient } from '@angular/common/http'; @Injectable() export class MyService { constructor(private httpOne: HttpClient, private httpTwo: HttpClient) {} // Use the first HttpClient instance with two interceptors makeRequestWithHttpClientOne() { this.httpOne.get('https://example.com/api').subscribe((response) => { // Handle the response }); } // Use the second HttpClient instance with one interceptor makeRequestWithHttpClientTwo() { this.httpTwo.get('https://example.com/api').subscribe((response) => { // Handle the response }); } }

With this approach, you can have two separate instances of HttpClient with different interceptors in Angular 4.3. Each instance can be injected into different services or components based on your requirements.

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