nginx websocket配置 Handshake failed due to invalid Upgrade header: null

Handshake failed due to invalid Upgrade header: null

我已经按要求 nginx配置了.还是显示NULL, 应该怎么配置呢?奇怪.
我们服务有开发一个web-socket :rent-socket2

页面去打开的时候:

去后台看错误:

我要怎么样才能连这个WEB-SOCKET呢

https://blog.csdn.net/qq_33914912/article/details/91363164

老哥解决没，我也遇到了