只需要在高级设置中添加如下自定义设置即可（注意修改proxy_pass字段）：

location / {
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  proxy_set_header X-Forwarded-Proto $scheme;
  proxy_set_header Host $http_host;
  proxy_set_header X-Real-IP $remote_addr;
  proxy_set_header Range $http_range;
  proxy_set_header If-Range $http_if_range;
  proxy_redirect off;
  proxy_pass http://192.168.31.91:5244;
  client_max_body_size 20000m;
}