intercept(req, next) {
    let token = this.authService.getAccessToken();
      if(req.url=='http://localhost:3000/api/v1/auth/refresh-token'){
        console.log('Url Refresh-token');
        return next.handle(req); //tutaj error
      } else if(this.authService.isAccessActive() && this.authService.isRefreshActive()){
        req = req.clone({
          setHeaders: {
            'access-token': token
          }
        });
        return next.handle(req);
      } else if(this.authService.isRefreshActive()) {
        console.log('Uruchamiam genAccesToken');
        //get new access token
        this.authService.genNewAccessToken().subscribe((res: ServerResponse) => {
          console.log('new token generated' + res.message);
          if(res.success){
            console.log(res.content['access_token']);
            localStorage.setItem('access_token', res.content['access_token']);
            req = req.clone({
              setHeaders: {
                'access-token': res.content['access_token']
              }
            });
            return next.handle(req);
          } else {
            console.log('Jakis blad z genAccessToken');
            return next.handle(req);
          }
        });
      } else {
        localStorage.removeItem('access_token');
        localStorage.removeItem('refresh_token');
        return next.handle(req);
      }
  }