Angular2在获取资源时监视302重定向 [英] Angular2 watch for 302 redirect when fetching resource

问题描述

我需要从我公司拥有的另一个域中提取一些资源.我想通过GET请求提取受保护的HTML内容.

I have a requirement to pull a few resources from another domain held by my company. I want to pull secured HTML content with GET requests.

当用户从应用程序中注销时，请求的内容将返回302到登录页面.

When a user is signed out of the application the requested content will return a 302 to the login page.

我尝试嗅探302标头的尝试并没有返回到目前为止我希望的结果.我的Observable返回的响应是200(登录页面).

My attempts to sniff the headers for a 302 haven't returned what I'd hoped for so far. The response returned by my Observable is a 200 (login page).

这是我的示例应用程序.

Here is my sample app.

export class MenuComponent implements OnInit {

    private _resourceUrl = "http://localhost:3001/resources/menu";

    constructor(private _http: Http){
    }

    menu: string;

    ngOnInit(): void {
        this.getMenu()
            .subscribe(
                response => {
                    console.log(`Response status: ${response.status}`);

                    this.menu = response.text();
                },
                error => console.log(<any>error));
    }

    getMenu(): Observable<Response>{        
        return this._http.get(this._resourceUrl)
            .map((response: Response) => response)
            .catch(this.handleError);
    }

    private handleError(error: Response){
        console.log(error);
        return Observable.throw(error.json().error || 'Server Error');
    }
}

我什至在正确的轨道上吗?

Am I even on the right track?

推荐答案

如果服务器发送带有302状态代码的重定向，并且该URL带有要在Location标头中进行重定向的URL，则该重定向将由浏览器自动处理，即对此URL的请求已执行.

If the server sends a redirect with a 302 status code with the URL to redirect within a Location header, the redirect is automatically handled by the browser, i.e. a request to this URL is executed.

这就是为什么XHR(及其周围的Angular2包装器，即Http类)看不到第一个请求的结果，而只能看到第二个请求的响应的原因.

That's why XHR (and the Angular2 wrapper around it, i.e. the Http class) won't see the result of the first request but only the response of the second one.

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