updatePassenger(passenger: Passenger): Observable<Passenger> { let headers = new Headers({ 'Content-Type': 'application/json' }); let options = new RequestOptions({ headers: headers }); return this.http .put(`${PASSENGER_API}/${passenger.id}`, passenger, options) .map((response: Response) => response.json()); }
From Angular V4, there is new HttpClient module, in which HttpHeaders is an immutable api.
const headers = new HttpHeaders() .set("X-CustomHeader", "custom header value"); this.courses$ = this.http .get( "/courses.json", {headers}) .do(console.log) .map(data => _.values(data));