“proxy_set_header 升级”导致“real_ip_header”不起作用

Question

nginx配置：

map $http_upgrade $connection_upgrade {
  default keep-alive;
  'websocket' upgrade;
}
set_real_ip_from 127.0.0.1;
set_real_ip_from 192.168.203.1;
real_ip_recursive on;
real_ip_header X-Forwarded-For;
....
location /
{
      gzip  off;
      proxy_pass http://127.0.0.1:8080;

      proxy_http_version 1.1;
      proxy_set_header Upgrade $http_upgrade;#this line
      #proxy_set_header Connection $connection_upgrade;
}

“proxy_set_header升级”将导致转发请求丢失“X-Real-IP”标头，如果注释掉此行它将起作用。nginx版本：1.20.0 谢谢！