server{
    server_name great.com;
    root /www/gp;
    expires off;
    try_files $uri/index.html /dev/null =404;

    location ~* .(js|jpg|png|css)$ {
        root /www/gp;
        expires 30d;
    }

    location /tw/ {
        autoindex on;
        root /www/gp/tw;
    }

}

.
├── index.html
└── tw
    ├── about.html
    ├── brand01.html
    ├── brand.html
    ├── contact.html
    ├── css
    ├── faq01.html
    ├── faq02.html
    ├── images
    ├── js
    └── news.html