headers 传递属性注意事项

headers 有关键字 需要避免

只要匹配到任意一个关键字，请求就会终止

关键字如下：

1. Accept
2. Connection
3. Content
4. Cookie
5. Cookie2
6. Content
7. Date
8. Expect
9. Host
10. Keep
11. Referer
12. TE
13. Trailer
14. Transfer
15. Upgrade
16. User
17. Via

错误示范：

headers:{
         'Proxy-Url': '/admin/API/tree/devices',
         'Proxy-Header-Accept':'application/json;charset=UTF-8',
         'Proxy-Header-Content-Type':'application/json;charset=UTF-8'
}

正确示范：

headers: {
        'Ph-Url': '/admin/API/tree/devices',
        'Ph-Accept': 'application/json;charset=UTF-8',
        'Ph-Content-Type': 'application/json;charset=UTF-8'
      },