const headers: Headers = new Headers();
headers.append('Content-Type', 'application/json');
headers.append('Authorization', 'Bearer: 123213');
this.http.post('https://127.0.0.1:502', JSON.stringify(token), {headers: headers}).subscribe();

import {Http, Headers, RequestOptions} from '@angular/http';

export class AppComponent {
    constructor(private http: Http) {
        let headers = new Headers();
        headers.append('Content-Type', 'application/json');
        headers.append('authentication', `hello`);

       let options = new RequestOptions({headers: headers});
       this.http.post(
           "http://localhost:3000/contacts",
           JSON.stringify({id: 4, name: 'some'}),
           options
       ).subscribe();

import {Http, Headers, RequestOptions} from '@angular/http';

constructor(private http: Http) {
            this.headers = new Headers();
            this.headers.append('content-type', 'application/json');
    }

return this.http.post(url, jsonData, this.headers).map((resp: Response) => resp.json());

login(credintials: Authenticate): Observable<any> {

    const body = {
        username: credintials.username,
        password: credintials.password,
        grant_type: 'password',
        client_id: credintials.client_id
    };
    const headers = new HttpHeaders()
        .set('Content-Type', 'application/x-www-form-urlencoded')
        .set('Authorization', 'Basic loremlorem');

    return this.http.post(`${baseUrl}/uaa/oauth/token`,
        body,
        {
            headers: headers
        }
    );
}