Question

这个问题在这里被问到，但是，我无法在那些问题中找到答案，我相信我已完成了所有的研究，

一个。我到目前为止所做的事情：

我尝试过.share Link for the Same
我试图检查它是否是预检请求，并在我的网络标签中找到了这个：

有2个OPTION调用和2个GET调用。所以，我们可以肯定它不是PREFLIGHT请求。

现在转向我的编码部分：

Component
------------


    constructor(
            private _notificationService: NotificationService) {
            this.getNotification();
        }


    getNotification() {
            this._notificationService.getNotifications().subscribe(notifications => {
                this.notificationList = notifications;
            });
        }



Service:
-------------

    constructor(private http: Http,private config: Configuration) { }

     getNotifications() {
            const headers = new Headers({
                'c-t-tenant': 'TENANT NAME',
                'c-t-apitoken': 'TOKEN-NAME',
                'Content-Type': 'application/json',
            });
            return this.http.get(this.config.notificationApiUrl, { headers: headers })
            .map((res: Response) => res.json());
        }

我非常确定这个API不会从其他地方调用。如果有人遇到这种情况，请在这里帮助我。

我的后端是Spring Boot，我也实现了CORS过滤器：

package com.bosch.cb.dashboard.auth;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Component;

@Component
public class SimpleCORSFilter implements Filter {

    public SimpleCORSFilter() {
        System.out.println("SimpleCORSFilter init");
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }

    @Override
    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain)
            throws IOException, ServletException {
           HttpServletRequest request = (HttpServletRequest) req;
            HttpServletResponse response = (HttpServletResponse) resp;

            response.setHeader("Access-Control-Allow-Origin", "*");
            response.setHeader("Access-Control-Allow-Credentials", "true");
            response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
            response.setHeader("Access-Control-Max-Age", "3600");             
            response.setHeader("Access-Control-Allow-Headers", "Access-Control-Allow-Headers, Pragma, Origin,Accept, b-h-apitoken ,X-Requested-With, Content-Type, Access-Control-Request-Method, Access-Control-Request-Headers, Authorization");

            chain.doFilter(request, response);
    }

    @Override
    public void destroy() {
    }

}

Answer 1

尝试

constructor( private _notificationService: NotificationService) {
    this.getNotification().subscribe(notifications => {
        this.notificationList = notifications;
    });
 }


getNotification() {
   return this._notificationService.getNotifications();
}

或

的解决方法

constructor( private _notificationService: NotificationService) {
    this.getNotification()
     .first()
     .subscribe(notifications => {
         this.notificationList = notifications;
     });
 }


getNotification() {
   return this._notificationService.getNotifications();
}

http GET方法调用两次

1 个答案: