http - 如何在 Response header Angular2 中获取值

Question

我想在响应 header (Set-Cookie) 中获取 session token 。如何访问响应 header 中的值？

var headers = new Headers();
            headers.append('Content-Type', 'application/json');
            console.log('url',this.loginUrl)
            this.http.post(this.loginUrl,
                JSON.stringify({ "username": value.username, "password": value.password }),
                { headers: headers })
                .map((res: Response) => 
                    res.json())
                .subscribe((res) => {
                    console.log("res", res);
                    this.loading.hide();
                    if (res.message_code == "SUCCESS") {
                        this.nav.setRoot(HomePage, {
                            username: value.username,
                        });
                    } else {
                        let alert =  Alert.create({
                            title: "Sign In Error !",
                            subTitle: 'Please Check Username or Password.',
                            buttons: ['Ok']
                        });
                        this.nav.present(alert);
                    }
                }, err => {
                    this.loading.hide();
                    console.log('error', err);

                }); 

这是我的标题响应

Answer 1

问题是您将响应映射到它的 json 内容。可以从响应本身到达 header 。所以你需要删除 map 运算符:

this.http.post(this.loginUrl,
       JSON.stringify({ "username": value.username, "password": value.password }),
       { headers: headers })
        /*.map((res: Response) =>  // <--------------
                res.json())*/
       .subscribe((res) => {
         var payload = res.json();
         var headers = res.headers;

         var setCookieHeader = headers.get('Set-Cookie')
         (...)
       });

在访问响应 header 时要小心使用 CORS。看到这个问题:

• angular2/http get location header of 201 response