Angular2登录服务JWT令牌

我尝试用angular2前端实现jwt令牌. 当我尝试使用Postman的post方法接收令牌时，会收到授权令牌，但在Angular中这样做会返回空响应对象. 这是我使用的Angular服务的代码段.

I try to implement the jwt token with angular2 front-end. When I try receive the token with post method using Postman I receive authorization token but doing so in Angular returns null response object. Here's snippet code of Angular service I use.

    return this.http.post(this.authUrl, { username: username, password: password })
                .map((response: Response) => {
                    console.log(username   ' '   password);
                    // login successful if there's a jwt token in the response
                    let token = response.json() && response.json().token;
                    console.log(token);
                    if (token) {
                        // set token property
                        this.token = token;

                        // store username and jwt token in local storage to keep user logged in between page refreshes
                        localStorage.setItem('currentUser', JSON.stringify({ username: username, token: token }));

                        // return true to indicate successful login
                        return true;
                    } else {
                        // return false to indicate failed login
                        return false;
                    }
                });

问题是，当我尝试登录令牌时，令牌与响应相同. 对于代码的后端部分，我遵循了 jwt令牌的此实现.

The thing is that when I try to log the token is null same with response. For the back-end portion of code I followed this implementation of jwt token.

我唯一的线索就是尝试调用类似的post方法

The only clue I have is that trying to invoke post method like that

this.http.post<any>(this.authUrl, { username: username, password: password }).subscribe();

我收到订户对象.使用toPromise()而不是subscribe() 我得到了ZoneAwarePromise，但是在两种情况下都找不到令牌.

I receive Subscriber object. Doing so with toPromise() instead of subscribe() I got ZoneAwarePromise but I cannot locate token in both cases.