Adds http interceptros to a module

app.module.ts

import {NgModule} from '@angular/core';
import {BrowserModule} from '@angular/platform-browser';
import {HTTP_INTERCEPTORS, HttpClientModule} from '@angular/common/http';

import {AppComponent} from './app.component';
import {BaseURLInterceptor} from './services/base-url.interceptor';
import {HttpErrorInterceptor} from './services/http-error.interceptor';

@NgModule({
  declarations: [ AppComponent ],
  imports: [
    BrowserModule,
    HttpClientModule
  ],
  providers: [
    { provide: HTTP_INTERCEPTORS, useClass: BaseURLInterceptor, multi: true },
    { provide: HTTP_INTERCEPTORS, useClass: HttpErrorInterceptor, multi: true }
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }