app.service.ts

import {Injectable} from '@angular/core';
import {Router} from '@angular/router';
import {HttpClient} from '@angular/common/http';

@Injectable()
export class AppService {

  constructor(private router: Router,
              private http: HttpClient) {
  }

  getOrganizationUnits() {
    this.http.post('/access/oai-sets/organizational-units', ['707c7bc3-bfa1-4846-a62f-5ce95ecf1444'])
      .subscribe((data) => {
        console.log('test : ', data);
      });
  }
}