使用nginx代理了几个系统，采用不同的二级域名，但是每次操作后总是出现提示操作失败，要求重新登录，不知道是不是跟用了websocket有关系，麻烦帮看看如下nginx配置是否有问题。
ngixn配置如下：
server {
listen 80;
server_name ins.test.com;

    #charset koi8-r;

    #access_log  logs/host.access.log  main;

    location /websocket {
        proxy_pass  http://ins;
        proxy_set_header Host $http_host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        #支持websocket的ws协议,使nginx支持与后端的长连接,http1.1协议才支持，nginx默认是1.0
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
    }

    location / {
        proxy_pass  http://ins;
        proxy_set_header Host $http_host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }

    #error_page  404              /404.html;

    # redirect server error pages to the static page /50x.html
    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   html;
    }
}