Exception Handling about spring-petclinic-angular HOT 1 CLOSED

          <input type="text" class="form-control" id="firstName" [(ngModel)]="owner.firstName" minlength="2" required name="firstName" #firstName="ngModel"/>
          <span class="glyphicon form-control-feedback" [class.glyphicon-ok]="firstName.valid" [class.glyphicon-remove]="!firstName.valid" aria-hidden="true"></span>
          <span class="help-block" *ngIf="firstName.dirty && firstName.hasError('required')">First name is required</span>
          <span class="help-block" *ngIf="firstName.dirty && firstName.hasError('minlength')">First name must be at least 2 characters long</span>

  private handleError(error: Response | any) {
    console.log('handleError log: ');
    let errMsg: string;
    if (error instanceof Response) {
      if (!(error.text() === '' )) {  // if response body not empty
        const body = error.json() || '';
        const err = body.error || JSON.stringify(body);
        errMsg = `${error.status} - ${error.statusText || ''} ${err}`;
      } else {
        console.log('binding errors header not empty');
        errMsg = error.headers.get('errors').toString();
      }
    } else {
      errMsg = error.message ? error.message : error.toString();
    }
    console.error(errMsg);
    return Observable.throw(errMsg);
  }