Nginx反向代理WebSocket

worker_processes  1;
events {
    worker_connections  1024;
}

http {
    include       mime.types;
    default_type  application/octet-stream;
    sendfile        on;
    autoindex       on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    map $http_upgrade $connection_upgrade {
        default upgrade;
        '' close;
    }

    server {
        listen       80;
        server_name  example.com;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            proxy_pass http://120.27.114.229/;
	    proxy_redirect off;

	    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_http_version 1.1;
    	    proxy_set_header Upgrade $http_upgrade;
	    proxy_set_header Connection "upgrade";
        }
    }
}