upstream webman2 {
    server 127.0.0.1:8989;
}

server {
  server_name jj2.com;
  listen 80;
  root /your/webman/public;

  location / {
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header Host $host;
      if (!-f $request_filename){
          proxy_pass http://webman;
      }
  }
}