angular2 basic authorization on get request - 405 - drupal

Question

I'm trying to get basic authorization to work for a Get request, but I'm getting 2 exceptions:
OPTIONS http://localhost/drupal/user/1?_format=json
XMLHttpRequest cannot load http://localhost/drupal/user/1?_format=json. Response for preflight has invalid HTTP status code 405
I'm using angular2 with drupal 8 backend
here is my service
var _baseUrl = "http://localhost/drupal";
#Injectable()
export class DrupalService {
private actionUrl: string;
constructor(private _http: Http, private _apiUrl: DrupalApi) {
this.actionUrl = _baseUrl + _apiUrl;
}
authHeaders() {
let username = 'username';
let password = 'password';
let token = btoa(username + ':' + password);
var headers = new Headers();
headers.append('Authorization', 'Basic ' + token);
headers.append('Content-Type', 'application/json');
headers.append('Accept', 'application/json');
return headers;
}
public GetSingle = (id: number): Observable<Response> => {
return this._http.get(this.actionUrl + id + '?_format=json'
, {headers: this.authHeaders()}).map(res => res.json());
}
}
but it works when I try the same request from postman app
how can I fix it?

Answer 1

In Postman, you are sending a header:
Authorization: Basic bXVyaGFmOmhleGFkZWNpbWFsMDU
But in angular you are passing:
headers.append('Authorization', 'Basic ' + btoa('bXVyaGFmOmhleGFkZWNpbWFsMDU'));
which will end up being:
Authorization: Basic YlhWeWFHRm1PbWhsZUdGa1pXTnBiV0ZzTURV
So, just don't convert the string to base64
headers.append('Authorization', 'Basic bXVyaGFmOmhleGFkZWNpbWFsMDU');
Update
Error code 405 means : Method Not Allowed, Which means, drupal does not allow OPTIONS requests. I've not worked with Drupal before. But, there should be a way to allow OPTIONS requests.