在我的Angular 2项目中，我从返回Observable的服务中进行API调用。调用代码然后订阅这个可观察的。例如：
getCampaigns(): Observable<Campaign[]> {
return this.http.get('/campaigns').map(res => res.json());
}
假设服务器返回401.如何在全局范围内捕获此错误并重定向到登录页面/组件？
谢谢。
这里是我到目前为止：
// boot.ts
import {Http,XHRBackend,RequestOptions} from 'angular2/http';
import {CustomHttp} from './customhttp';
bootstrap(AppComponent,[HTTP_PROVIDERS,ROUTER_PROVIDERS,new Provider(Http,{
useFactory: (backend: XHRBackend,defaultOptions: RequestOptions) => new CustomHttp(backend,defaultOptions),deps: [XHRBackend,RequestOptions]
})
]);
// customhttp.ts
import {Http,ConnectionBackend,Request,RequestOptions,RequestOptionsArgs,Response} from 'angular2/http';
import {Observable} from 'rxjs/Observable';
@Injectable()
export class CustomHttp extends Http {
constructor(backend: ConnectionBackend,defaultOptions: RequestOptions) {
super(backend,defaultOptions);
}
request(url: string | Request,options?: RequestOptionsArgs): Observable<Response> {
console.log('request...');
return super.request(url,options);
}
get(url: string,options?: RequestOptionsArgs): Observable<Response> {
console.log('get...');
return super.get(url,options);
}
}
