Angular HttpClient (5)

http-client-feature.service.ts

import { Injectable } from '@angular/core';
import { HttpClient, HttpHeaders, HttpParams, HttpResponse } from '@angular/common/http';
import { Observable } from 'rxjs/Observable';

/** This class implements some features that should be tested. */
@Injectable()
export class HttpClientFeatureService {

  constructor(
    private http: HttpClient
  ) {}

  login(user: string, password: string): Observable<boolean> {
    const body = new HttpParams()
      .set(`user`, user)
      .set(`password`, password);
    const headers = new HttpHeaders({ 'Content-Type': 'application/x-www-form-urlencoded' });

    return this.http.post(`auth/login`, body.toString(), { headers, observe: 'response' })
      .map((res: HttpResponse<Object>) => res.ok)
      .catch((err: any) => Observable.of(false));
  }

}

There is an easier way though!

let body = new URLSearchParams();
body.set('username', this.username);
body.set('password', this.password);
body.set('grant_type', gtype);
body.set('client_id', clid);
body.set('client_secret', secid);
URLSearchParams() will automatically encode all of the body content in application/x-www-form-urlencoded

then:
return this.http.post(this.apiRoot, body).subscribe(result =>