角度为7的HTTP拦截器不添加标头

Question

我试图通过使用下面的代码在http标头中设置身份验证令牌。它不会在标头中设置身份验证令牌。我在这里想念的是什么？尝试了以下链接提供的解决方案，但没有运气。

https://stackoverflow.com/questions/54820257/angular-7-httpinterceptor-not-adding-header-to-request

intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
        const token: string = sessionStorage.getItem('token');
        request = request.clone({ url: `${this.baseUrl}/${request.url}` });

        const clonedRequest = request.clone({
            headers: new HttpHeaders({
                Authorization: token,
                "Content-Type": "application/json"
            })
        });
        return next.handle(clonedRequest);
    }