Angular Catch HTTP状态代码

Question

我有一个服务类，它对REST服务器进行HTTP POST调用。服务器使用HTTP状态代码响应错误，如果资源不存在则为404，如果用户无权访问此资源，则为401，依此类推。

@Injectable()
export class BacklogService extends RestService {

    constructor(
        private http: Http,
        private authenticationService: AuthenticationService) {
        super();
    }

    public create(
        projectId: number,
        type: string,
        description: string,
        isReady: boolean,
        estimation: string | null) {

        const headers = new Headers();
        headers.append('Accept', 'application/json');
        headers.append('Authorization', 'Bearer ' + this.authenticationService.getToken());
        const options = new RequestOptions({headers: headers});

        return this.http.post(this.getRequestUrl('Project/' + projectId + '/Backlog'), {type: type, description:description, isReady: isReady, estimation: estimation}, options).subscribe(
            (response: Response) => {
                return response.json();
            },
            (error: Error) => {
                // error.status doesn't work
                console.log("error=", error);
            }
        );
    }

}

我试图在错误情况下捕获这些HTTP状态代码。如果我输出错误变量，它包含我期望的正确数据，但我无权访问此对象及其键。访问error.status不起作用。

如何解决我的问题？