Interceptor not intercepting http requests (Angular 6)

Question

I\'m in the proces of adding an interceptor to my angular 6 project. To make calls to my API, I need to add a bearer token to all calls. Unfortunately the interceptor does n

Answer 1

You use the right way to intercept.

For people who use interceptor, you need to do 2 modifications :

Interceptor in service

import { Injectable } from '@angular/core';
import { HttpInterceptor, HttpHandler, HttpRequest, HttpEvent, HttpResponse }
  from '@angular/common/http';

import { Observable } from 'rxjs/Observable';
import 'rxjs/add/operator/do';

@Injectable()
export class MyInterceptor implements HttpInterceptor {
  intercept(
    req: HttpRequest,
    next: HttpHandler
  ): Observable> {

    return next.handle(req).do(evt => {
      if (evt instanceof HttpResponse) {
        console.log('---> status:', evt.status);
        console.log('---> filter:', req.params.get('filter'));
      }
    });

  }
}

Provide HTTP_INTERCEPTOR

import { HttpClientModule, HTTP_INTERCEPTORS } from '@angular/common/http';
(...)
  providers: [
    { provide: HTTP_INTERCEPTORS, useClass: MyInterceptor, multi: true }
  ],

Read this article for more details. It's pretty good