nginx为项目解析域名！

为端口配置域名：

server {
        listen 80;
        server_name www.*.cn;


        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;

                # prevents 502 bad gateway error
                proxy_buffers 8 32k;
                proxy_buffer_size 64k;

                proxy_pass http://127.0.0.1:3000;
                proxy_redirect off;

                # enables WS support
                proxy_http_version 1.1;
                proxy_set_header Upgrade $http_upgrade;
                proxy_set_header Connection  "upgrade";
        }
}