@Injectable()
export class HeaderInterceptor implements HttpInterceptor {
intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
// Clone the request to add the new header
// HttpHeader object immutable - copy values
@Injectable()
export class HeaderInterceptor implements HttpInterceptor {
intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
// Clone the request to add the new header
// HttpHeader object immutable - copy values