D-Net

import { Injectable } from '@angular/core';

import {HttpClient, HttpHeaders} from "@angular/common/http";

import {map} from "rxjs/operators";

@Injectable()

export class SubjectsService {

  constructor(private http: HttpClient) {

  }

  addSubjects(url: string, subjects: any) {

    let headers = new HttpHeaders({'Content-Type': 'application/json'});

    const body = JSON.stringify(subjects);

      return this.http.post(url, body, {headers: headers})

                        // .do(request => console.log("Insert Response:"+request.status))

                        //.map(res => res.json())

                        .pipe(map(res => {

                          res['method'] = 'post';

                          return res;

                        }));

  }

  removeSubjects(url: string, subjects: any) {

      //const headers = new Headers({'Content-Type': 'application/json'});

      let headers = new HttpHeaders({'Content-Type': 'application/json'});

      const body = JSON.stringify(subjects);

      //const options = new RequestOptions({headers: headers, body: body});

      //return this.http.delete(url, options)

      return this.http.request('delete', url, { body: body, headers: headers})

                        // .do(request => console.log("Delete Response:"+request.status))

                        //.map(res => res.json())

                        .pipe(map(res => {

                          res['method'] = 'delete';

                          return res;

                        }));

  }

}