刚开始我访问 sockets.jiyinyiyong.info 并在浏览器里连接 socket 没有成功, 浏览器端出现报错

Error during WebSocket handshake: 'Connection' header value is not 'Upgrade'

服务器上的信息是:

a connection
   debug - websocket writing 5:::{"name":"cast"}
   debug - websocket writing 5:::{"name":"cast"}
   debug - websocket writing 5:::{"name":"cast"}
   debug - websocket writing 5:::{"name":"cast"}
   debug - websocket writing 5:::{"name":"cast"}
   debug - websocket writing 5:::{"name":"cast"}
   debug - websocket writing 5:::{"name":"cast"}
   debug - websocket writing 5:::{"name":"cast"}
   debug - websocket writing 5:::{"name":"cast"}
   debug - websocket writing 5:::{"name":"cast"}
   debug - setting request GET /socket.io/1/xhr-polling/11404802851312554938?t=1344062033928
   debug - setting poll timeout
   debug - discarding transport
   debug - cleared heartbeat interval for client 11404802851312554938
   debug - clearing poll timeout
   debug - xhr-polling writing 5:::{"name":"cast"}
   debug - set close timeout for client 11404802851312554938

我搜到的问题大致说浏览器那个错误是因为 header 被破破坏了… http://stackoverflow.com/questions/6576403/websocket-handshake-failing-in-webkit-with-socket-io-0-7 http://stackoverflow.com/questions/6769342/websockets-handshake-problem 就怀疑到 Nginx 上去了, 想起来以前也遇到过… 就测试 jiyinyiyong.info:8000 去访问, 也 io.connect() 这个网址, 再就能显示了… 照这样问题就出在 Nginx 的配置上边了, 不怎么懂 Nginx, 求助啊, 下面是我出错的时候的配置:

upstream sockets {
    server 127.0.0.1:8005;
}

server {
    listen 0.0.0.0:80;
    server_name sockets.jiyinyiyong.info;
    access_log /var/log/nginx/sockets.log;

    location / {
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header Host $http_host;
      proxy_set_header X-NginX-Proxy true;

      proxy_pass http://sockets;
      proxy_redirect off;
    }
 }