使Nginx支持WebSocket

server {
    listen   80;
    server_name xx.xx.com;
    location / {
    proxy_pass http://172.17.108.67:8080;
         #以下三行代码
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
    }
  }