nginx正向代理问题

[aabbabababaa]

location /dingding/{
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header REMOTE-HOST $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_pass https://oapi.dingtalk.com/;
}

用了这个正向代理去访问，返回403错误，怎么查看跳转到的地址是什么了？