How to read Http response header in angular

This is my angular service class code.I have called restful web service in this class ,response is coming . Response header has JWT web token I want to read response header and take JWT web token in this authUser service function. how to do it?

import { Injectable } from '@angular/core';
import {ResponseBeanModule} from '../../module/responsebean/responsebean.module';
import { Http, Headers, Response } from '@angular/http';


@Injectable({
providedIn: 'root'
})
export class AuthenticationService {
constructor(private http: Http) { this._prepare()}
private userUrl = 'http://192.168.1.152:8080/api/user/';

endpointUrl: String;
responseBeanModule: ResponseBeanModule = new ResponseBeanModule();
options: any;
headers: any;

_prepare () {
this.endpointUrl = this.userUrl;
this.headers = new Headers();
this.headers.set('Content-Type', 'application/json');
this.options = {
headers: this.headers,
observe: 'body'
};
}



public authUser(loginBean): Promise<ResponseBeanModule> {
return new Promise((resolve, reject) => {
this.http.post(this.userUrl, loginBean, this.options).subscribe(
(data) => {
alert(JSON.stringify(data));
this.responseBeanModule = JSON.parse(data['_body'])
return resolve( this.responseBeanModule );
},
(err) => {
return reject(err);
}
);
});

}

}

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